EP0954697A1 - Fuel pumping device for two-stroke engines with an additional driving unit - Google Patents
Fuel pumping device for two-stroke engines with an additional driving unitInfo
- Publication number
- EP0954697A1 EP0954697A1 EP97935469A EP97935469A EP0954697A1 EP 0954697 A1 EP0954697 A1 EP 0954697A1 EP 97935469 A EP97935469 A EP 97935469A EP 97935469 A EP97935469 A EP 97935469A EP 0954697 A1 EP0954697 A1 EP 0954697A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- fuel
- membrane
- stroke
- pump
- pump piston
- 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
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
- F02M59/02—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type
- F02M59/10—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type characterised by the piston-drive
- F02M59/107—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type characterised by the piston-drive pneumatic drive, e.g. crankcase pressure drive
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M37/00—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
- F02M37/04—Feeding by means of driven pumps
- F02M37/12—Feeding by means of driven pumps fluid-driven, e.g. by compressed combustion-air
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M51/00—Fuel-injection apparatus characterised by being operated electrically
- F02M51/04—Pumps peculiar thereto
-
- 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
- F04B17/03—Pumps characterised by combination with, or adaptation to, specific driving engines or motors driven by electric motors
- F04B17/04—Pumps characterised by combination with, or adaptation to, specific driving engines or motors driven by electric motors using solenoids
- F04B17/042—Pumps characterised by combination with, or adaptation to, specific driving engines or motors driven by electric motors using solenoids the solenoid motor being separated from the fluid flow
-
- 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
- F04B9/00—Piston machines or pumps characterised by the driving or driven means to or from their working members
- F04B9/08—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid
- F04B9/12—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid the fluid being elastic, e.g. steam or air
- F04B9/123—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid the fluid being elastic, e.g. steam or air having only one pumping chamber
- F04B9/125—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid the fluid being elastic, e.g. steam or air having only one pumping chamber reciprocating movement of the pumping member being obtained by a double-acting elastic-fluid motor
-
- 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
- F04B9/00—Piston machines or pumps characterised by the driving or driven means to or from their working members
- F04B9/08—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid
- F04B9/12—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid the fluid being elastic, e.g. steam or air
- F04B9/123—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid the fluid being elastic, e.g. steam or air having only one pumping chamber
- F04B9/127—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid the fluid being elastic, e.g. steam or air having only one pumping chamber rectilinear movement of the pumping member in the working direction being obtained by a single-acting elastic-fluid motor, e.g. actuated in the other direction by gravity or a spring
Definitions
- Fuel pump device for two-stroke engines with an additional drive unit is
- the invention is based on a fuel pump device for an internal combustion engine operating according to the two-stroke principle according to the preamble of claim 1.
- Such a fuel pump device is from the
- Diaphragm piston pump that pumps and compresses fuel to operate an injector.
- the fuel is supplied to the diaphragm piston pump from a fuel tank via a pre-feed pump.
- the fuel compressed there is delivered to the injection valve.
- the diaphragm piston pump receives its drive from the pulse air derived from the crankcase of the internal combustion engine.
- a membrane sits on the piston that compresses the fuel and is acted upon by the pulse air on the side facing away from the piston.
- the overpressure that arises in the crankcase during one work cycle actuates the compression piston.
- the return stroke of the compression piston is taken over by a mechanical spring in combination with the crankcase vacuum in the compression stroke of the two-stroke engine.
- DE 41 25 593 AI describes a comparable diaphragm piston pump for a fuel injection, in which the compression piston is returned via a leaf spring assembly.
- the spring rate of the leaf spring assembly can be changed mechanically using an adjusting screw.
- the fuel pump device includes a membrane piston pump in which the pulse air connection opens into a housing space located between the membrane and the pump piston. At least one spring element acts on each side of the membrane, the spring element arranged in the housing space being supported on the membrane via the separate pump piston. With this design variant, the pulsed air is directly connected to the pump piston. On the one hand, this has the advantage that the oily impulse air flowing in from the crankcase lubricates the moving parts in this housing section, so that the spring supports and the seal between the pump piston and the housing part guiding it wear less. On the other hand, in the event of a leak between the pump piston and the housing part guiding it, the fuel escaping there is sucked out during the compression stroke of the two-stroke engine. This means that the fuel does not get outside like in the known diaphragm piston pumps.
- the fuel pump device is equipped with a drive unit, which supports it at least in the starting and / or idling phase.
- the drive unit acts by means of a preloading plunger which oscillates synchronously with the pressure pulsation of the gas quantity enclosed in the crankcase the membrane on the pump piston.
- the drive unit can be a permanent magnet generator, for example, which supplies the magnet with the necessary energy at the right time.
- the dynamic adjustment of the electromagnetic actuator is preferably carried out with a view to the optimal function when starting or idling. At higher engine speeds, electrical support is no longer required. The pressure pulsation is then sufficient to generate the minimum injection pressure.
- the pretensioning plunger of the drive unit can also be supported on the single spring element, which i.a. causes the compression stroke of the pump piston.
- the diaphragm piston pump can be equipped with a hand switch.
- the pretensioning plunger of the electrical drive unit is led out of the housing part opposite the rear of the diaphragm in the form of a manual switch. Pressing the hand button causes a compression stroke of the pump piston.
- two-stroke small engines such as those used in hand-held tools, after a complete fuel tank emptying or after a long period of inactivity, the injection line and the injection valve are prefilled, so that the starting process is shortened.
- the diaphragm piston pump described is constructed in such a way that the valves and the compression chamber can be separated from the components which enclose the diaphragm and guide the pump piston. This simplifies maintenance and repair on the one hand and production on the other.
- FIG 1 Fuel pump device for direct injection
- FIG. 1 shows the functional diagram of a fuel pump device for a direct injection system, as can be used with two-stroke engines.
- the fuel pressure is generated with a diaphragm piston pump (10).
- the diaphragm piston pump (10) sucks the fuel from a fuel tank (1), for example via a filter (2), via a suction valve (61) arranged inside a pump housing (11).
- the fuel drawn into a Compression chamber (51) into which a pump piston (22) is immersed.
- a pressure relief valve (80) for example into the fuel tank (1).
- the pump piston (22) protrudes with its rear end in the space (13) of the Pu pengeophuses (11), which is pneumatically connected to the crankcase of the internal combustion engine working according to the two-stroke principle.
- this pulse air space (13) the pump piston (22) is pressed via a spring element (15) against a membrane (41) reinforced with a membrane plate (42).
- a membrane (41) reinforced with a membrane plate (42).
- an ambient air space (33) On the back of the membrane (41), surrounded by a housing cover (31), is an ambient air space (33) in which two further spring elements (35) and (94) are arranged. Both spring elements (35, 94) counteract the other spring element (15).
- the prestressed spring elements (15, 35, 94) hold the diaphragm (41) in a central position, provided that the same air pressure is present on both sides of the diaphragm (41) and a drive unit (90) arranged on the housing cover (31) is switched off in a rest position .
- the drive unit (90) is a lifting magnet which has a pretensioning plunger (91) as an armature.
- the prestressing plunger (91) which is arranged in the housing cover (31) coaxially to the pump piston (22), consists of a shaft (92) and a yoke plate (93).
- the shaft (92) acts directly on the spring element (94).
- a winding (96) is arranged around it in a shell core (95).
- the pulse air flows into the pulse pressure chamber (13) with excess pressure and moves the diaphragm (41) downward, the spring element (15) tracking the pump piston (22) of the diaphragm (41) and the spring element (35) being further tensioned.
- the diaphragm piston pump (10) sucks fuel into the compression chamber (51) via a suction valve (61).
- the partially relaxing spring elements (35, 94) push the pump piston (22) into the compression chamber (51).
- the fuel flows via the pressure valve (71) to the injection valve (5) and / or to the fuel pressure accumulator (73).
- the compression stroke extends beyond the central position of the diaphragm (41) because the negative pressure now prevailing in the crankshaft housing has an effect on the diaphragm (41) towards the end of the stroke.
- the membrane (41) is sucked upwards.
- the winding (96) is energized synchronously with the compression stroke.
- the yoke plate (93) is pulled against the shell core (95), as a result of which the pretensioning plunger (91) clamps the spring element (94) against the diaphragm (41) and thus additionally supports the compression stroke of the pump piston (22).
- the winding is energized by a controller (99).
- the signal for energizing is given by a pressure sensor (97), which is pneumatically connected, for example, to the pulse air connection (14).
Landscapes
- 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)
- Reciprocating Pumps (AREA)
- Fuel-Injection Apparatus (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19631287A DE19631287B4 (en) | 1996-08-02 | 1996-08-02 | Fuel pump device for two-stroke engines with an additional drive unit |
DE19631287 | 1996-08-02 | ||
PCT/DE1997/001557 WO1998005860A1 (en) | 1996-08-02 | 1997-07-23 | Fuel pumping device for two-stroke engines with an additional driving unit |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0954697A1 true EP0954697A1 (en) | 1999-11-10 |
EP0954697B1 EP0954697B1 (en) | 2002-10-23 |
Family
ID=7801633
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP97935469A Expired - Lifetime EP0954697B1 (en) | 1996-08-02 | 1997-07-23 | Fuel pumping device for two-stroke engines with an additional driving unit |
Country Status (8)
Country | Link |
---|---|
US (1) | US6162028A (en) |
EP (1) | EP0954697B1 (en) |
JP (1) | JP2000515601A (en) |
AU (1) | AU709656B2 (en) |
CA (1) | CA2262522A1 (en) |
DE (2) | DE19631287B4 (en) |
ES (1) | ES2185966T3 (en) |
WO (1) | WO1998005860A1 (en) |
Families Citing this family (18)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6568926B1 (en) * | 2001-10-31 | 2003-05-27 | The Gorman-Rupp Company | Fluid metering pump |
DE10161132A1 (en) * | 2001-12-12 | 2003-06-26 | Siemens Ag | Diaphragm pump with integrated pressure sensor |
DE112004002131D2 (en) * | 2003-09-02 | 2006-07-13 | Hydraulik Ring Gmbh | Pump for conveying an exhaust aftertreatment medium, in particular a urea-water solution, for diesel engines |
ITBO20040485A1 (en) * | 2004-07-30 | 2004-10-30 | Magneti Marelli Holding S P A | HYDRAULIC ACTUATION FUEL PUMP FOR AN INTERNAL COMBUSTION ENGINE |
DE102005032843A1 (en) * | 2005-07-14 | 2007-01-25 | Robert Bosch Gmbh | Ammonia producer, vehicle and process for the production of ammonia |
DE102008002467A1 (en) * | 2008-06-17 | 2009-12-24 | Robert Bosch Gmbh | Dosing system for a liquid medium, in particular urea-water solution |
US9303607B2 (en) * | 2012-02-17 | 2016-04-05 | Ford Global Technologies, Llc | Fuel pump with quiet cam operated suction valve |
CN104963819A (en) * | 2015-06-09 | 2015-10-07 | 安庆卡尔特压缩机有限公司 | Novel compressor |
US20210285451A1 (en) * | 2018-10-02 | 2021-09-16 | Kenneth R. Soerries | Liquid Hydrocarbon Transfer System And Assembly |
US20200182164A1 (en) * | 2018-12-07 | 2020-06-11 | Polaris Industries Inc. | Method And System For Predicting Trapped Air Mass In A Two-Stroke Engine |
US11725573B2 (en) | 2018-12-07 | 2023-08-15 | Polaris Industries Inc. | Two-passage exhaust system for an engine |
US11639684B2 (en) | 2018-12-07 | 2023-05-02 | Polaris Industries Inc. | Exhaust gas bypass valve control for a turbocharger for a two-stroke engine |
US11828239B2 (en) | 2018-12-07 | 2023-11-28 | Polaris Industries Inc. | Method and system for controlling a turbocharged two stroke engine based on boost error |
US11174779B2 (en) | 2018-12-07 | 2021-11-16 | Polaris Industries Inc. | Turbocharger system for a two-stroke engine |
US11434834B2 (en) | 2020-01-13 | 2022-09-06 | Polaris Industries Inc. | Turbocharger system for a two-stroke engine having selectable boost modes |
US11788432B2 (en) | 2020-01-13 | 2023-10-17 | Polaris Industries Inc. | Turbocharger lubrication system for a two-stroke engine |
CA3105239C (en) | 2020-01-13 | 2023-08-01 | Polaris Industries Inc. | Turbocharger system for a two-stroke engine having selectable boost modes |
CN114452692B (en) * | 2022-01-25 | 2023-04-21 | 山东德沃环保科技有限公司 | Double-cavity balanced type combined filter plate and filter press |
Family Cites Families (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB884903A (en) * | 1959-09-28 | 1961-12-20 | Bendix Corp | Fuel supply system |
DE2248584C3 (en) * | 1972-10-04 | 1975-09-18 | Yamaha Hatsudoki K.K., Iwata, Shizuoka (Japan) | Fuel delivery device for an injection device of internal combustion engines |
US4022174A (en) * | 1974-03-19 | 1977-05-10 | Holec, N.V. | Electromagnetically actuated pumps |
US4086036A (en) * | 1976-05-17 | 1978-04-25 | Cole-Parmer Instrument Company | Diaphragm pump |
JPS57137648A (en) * | 1981-02-20 | 1982-08-25 | Hitachi Ltd | Fuel supply device |
US4705008A (en) * | 1983-07-25 | 1987-11-10 | Kleinholz Edward O | Fuel vaporizer |
BE899765R (en) * | 1983-07-28 | 1984-09-17 | Antoine Hubert | FUEL INJECTION DEVICE FOR A TWO-STROKE ENGINE. |
DE3727266C2 (en) * | 1987-08-15 | 1996-05-23 | Stihl Maschf Andreas | Fuel injection device for two-stroke engines |
DE4125593A1 (en) * | 1991-08-02 | 1993-02-04 | Stihl Maschf Andreas | FUEL INJECTION PUMP FOR A TWO-STROKE ENGINE IN A WORKING MACHINE, IN PARTICULAR A MOTOR CHAIN SAW |
US5315968A (en) * | 1993-03-29 | 1994-05-31 | Orbital Walbro Corporation | Two-stage fuel delivery system for an internal combustion engine |
FR2713717B1 (en) * | 1993-12-07 | 1996-01-26 | Rahban Thierry | Electromagnetic actuation pump with elastic collision of the moving part. |
DE19527629A1 (en) * | 1995-07-28 | 1997-01-30 | Bosch Gmbh Robert | Fuel pump |
-
1996
- 1996-08-02 DE DE19631287A patent/DE19631287B4/en not_active Expired - Fee Related
-
1997
- 1997-07-23 US US09/230,552 patent/US6162028A/en not_active Expired - Fee Related
- 1997-07-23 DE DE59708576T patent/DE59708576D1/en not_active Expired - Fee Related
- 1997-07-23 WO PCT/DE1997/001557 patent/WO1998005860A1/en active IP Right Grant
- 1997-07-23 AU AU38467/97A patent/AU709656B2/en not_active Ceased
- 1997-07-23 EP EP97935469A patent/EP0954697B1/en not_active Expired - Lifetime
- 1997-07-23 CA CA002262522A patent/CA2262522A1/en not_active Abandoned
- 1997-07-23 ES ES97935469T patent/ES2185966T3/en not_active Expired - Lifetime
- 1997-07-23 JP JP10507461A patent/JP2000515601A/en active Pending
Non-Patent Citations (1)
Title |
---|
See references of WO9805860A1 * |
Also Published As
Publication number | Publication date |
---|---|
DE19631287A1 (en) | 1998-02-05 |
JP2000515601A (en) | 2000-11-21 |
EP0954697B1 (en) | 2002-10-23 |
DE59708576D1 (en) | 2002-11-28 |
WO1998005860A1 (en) | 1998-02-12 |
CA2262522A1 (en) | 1998-02-12 |
AU3846797A (en) | 1998-02-25 |
US6162028A (en) | 2000-12-19 |
DE19631287B4 (en) | 2004-01-15 |
AU709656B2 (en) | 1999-09-02 |
ES2185966T3 (en) | 2003-05-01 |
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