EP0995030A1 - Direct injection fuel pump for engine with controlled ignition and injection system comprising same - Google Patents
Direct injection fuel pump for engine with controlled ignition and injection system comprising sameInfo
- Publication number
- EP0995030A1 EP0995030A1 EP98936458A EP98936458A EP0995030A1 EP 0995030 A1 EP0995030 A1 EP 0995030A1 EP 98936458 A EP98936458 A EP 98936458A EP 98936458 A EP98936458 A EP 98936458A EP 0995030 A1 EP0995030 A1 EP 0995030A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- compartment
- pump according
- chamber
- pump
- injection
- 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
- F02M59/12—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps having other positive-displacement pumping elements, e.g. rotary
- F02M59/14—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps having other positive-displacement pumping elements, e.g. rotary of elastic-wall type
-
- 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
- F02M37/046—Arrangements for driving diaphragm-type pumps
-
- 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
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B43/00—Machines, pumps, or pumping installations having flexible working members
- F04B43/02—Machines, pumps, or pumping installations having flexible working members having plate-like flexible members, e.g. diaphragms
- F04B43/06—Pumps having fluid drive
- F04B43/067—Pumps having fluid drive the fluid being actuated directly by a piston
Definitions
- the invention relates to pumps intended for the direct injection of fuel into the combustion chambers of a positive-ignition engine.
- the fuels used in spark ignition engines (petrol and liquefied petroleum gas) do not lubricate the surfaces with which they are in contact.
- Positive displacement piston pumps directly compressing the fuel therefore present risks of seizure.
- the pressure of these pumps, whose displacement is fixed, can only be regulated by dissipating energy in a return path, which deteriorates the energy balance, heats the fuel and can cause cavitation.
- a pump comprising fuel compression chambers each delimited by a membrane separated by a hydraulic fluid from a piston actuated by a turntable.
- the stroke of the piston and the volume of liquid occupying the compartment delimited by the piston and the membrane is constant, which leaves entirely the problem of regulating the flow rate and the injection pressure.
- an injection pump comprising, in a housing, a supply chamber of an injection circuit, separated by a deformable membrane from a compartment delimited by a bore of the housing and by a piston intended to be driven back and forth in operation.
- the chamber is connected to a fuel supply and to the injection circuit by non-return valves. The pressure of liquid occupying the compartment can be adjusted.
- the present invention aims to provide a high pressure injection pump which better meets those previously known than the requirements of practice, in particular in that it allows simple regulation of the volume moved by the pump, and this with a construction which eliminates practically the risk of seizure.
- the invention proposes in particular a pump according to claim 1. It can be seen that the invention causes each intermediate chamber occupied by a hydraulic fluid, having a lubricating action, to fill an adjusting action adding to its anti-seizing action. This adjustment action can be progressive or all or nothing. In the second case, it suffices to connect one of the compartments to the discharge to cancel the flow supplied by the corresponding module.
- the progressiveness can be obtained by adjusting the cross-section of a hydraulic fluid return leak to the discharge, using a solenoid valve with analog control or step by step.
- the presence of a leak reduces the displacement imposed on the membrane by the piston.
- the modules can each be assigned to an engine combustion chamber. However, it is more advantageous to use several controlled injectors, generally by electromagnetic means, which makes it possible to have a single source of supply of fuel under pressure.
- the modules can be connected to a common injection rail supplying all the injectors, the number of assemblies in service being chosen according to the engine speed.
- This all-or-nothing adjustment can be used with the progressive adjustment by continuous pressure adjustment or substituted for it.
- FIG. 1 is a schematic sectional view of the hydraulic part together or pump module
- FIG. 2 is a partial sectional view of a pump comprising several assemblies connected to a supply and to a common distribution manifold;
- Figure 3 is a schematic top view of Figure 2;
- FIG. 4 is an overall diagram of an injection system comprising a pump of the type shown in Figure 1;
- FIG. 5 shows a possible distribution of the capacities of several assemblies belonging to the same pump.
- the pump module shown diagrammatically in FIG. 1 comprises a housing 10 made of several assembled parts, delimiting a chamber 12 for supplying fuel under high pressure.
- the chamber 12 communicates with the outside via an inlet nozzle 14 and a discharge nozzle 16.
- Non-return valves are interposed between the nozzles and the chamber 12.
- the supply chamber 12 comprises a movable wall constituted by a flexible membrane 18, generally made of elastomer.
- the periphery of the membrane 18 is pinched between two of the component parts of the housing 10.
- On the membrane 18 is supported a cup 20 provided with a flange intended to bear on an abutment ring 22 of the housing.
- a return spring 24 tends to apply the rim of the cup against the stop ring 22, thereby fixing the rest position of the membrane.
- the membrane 18 separates the chamber 12 from a compartment 26 delimited by a bore 28 formed in the housing and by a piston 30 which is driven, during the operation of the pump, by a back and forth movement caused in general by a rotary cam 32.
- a spring 33 exerting a weak force compared to the force of spring 24, tends to keep the piston 30 in abutment against the cam 32.
- the compartment 26 is intended to contain a hydraulic fluid (which may be the engine oil) under an adjustable pressure either gradually or all or nothing.
- a hydraulic fluid which may be the engine oil
- the effective displacement of the membrane 18 can be gradually modified during the back and forth movement of the piston and therefore the flow rate of the pump.
- the pressure in compartment 26 can for example be switched using a three-way solenoid valve. This valve can be provided to isolate the chamber 26, connect it to a determined pressure source or connect it to a discharge tank.
- the compartment 26 is connected, by an intake check valve 34, to a source such as an engine oil inlet 36.
- the pump comprises several assemblies each having a supply chamber 12 and a compartment 26.
- the chambers 12 are arranged side by side. side and the cups 20 move in the vertical direction of the figure.
- the pistons 30 move on the contrary in radially arranged bores and are controlled by the same cam 32 or plate. In a variant, the pistons move parallel to each other in the same axial direction.
- the connections between the chambers 12 can be those shown in FIG. 3 when the pump comprises three assemblies regularly distributed around the axis of the housing 10.
- the inlet nozzle 14 is connected, by respective non-return valves, to the chambers by two holes 40 of the housing arranged in a V.
- the discharge end piece 16 is connected, by mutually orthogonal holes 42, to chambers 43 placed at the outlet of the chambers 12.
- the holes open at the periphery of the housing by extensions not shown, closed by plugs.
- FIG. 4 shows, by way of example, an injection system using a pump of the type shown in FIG. 1 (a single module being shown.
- the discharge nozzle 16 is connected to a distribution ramp 44 provided with a safety valve 46 against overpressure and of an accumulator 48.
- the distribution ramp supplies the injectors 50, the opening of which in sequence is caused by a generator electric pulse 52 controlled by a computer 54, which is loaded with software setting the strategy for controlling the injectors and the pump.
- the computer 54 may have a conventional general constitution. It receives signals representative of the engine operating parameters (position of the air throttle valve, angular position of the engine flywheel, composition of the exhaust gases, etc.) as well as the output signal from a pressure sensor 55 which prevails in the distribution manifold 44.
- the computer deduces from this data the flow rate to be supplied by the pump and controls the solenoid valve 56 accordingly.
- the control of the solenoid valve 56 by the management computer 54 can be carried out at a frequency much lower than the frequency of actuation of the pump. Because the flow rate is controlled by adjusting the effective displacement of the diaphragm, and therefore the volume delivered for a back and forth movement of the piston, there is no pressure drop comparable to that caused by rolling the fuel over a path. back to the tank.
- the pump will comprise several assemblies or modules, that is to say will have a constitution of the kind shown in FIGS. 2 and 3. Each assembly will be provided with its own solenoid valve 56 or with its own distributor, and may be ordered by all or nothing.
- the assemblies or modules advantageously have compartments 28 and different chambers 12.
- the pistons of the different assemblies can have different diameters and in particular contact surfaces with the liquid varying in geometric progression.
- a difference between the membrane surfaces provides different flow rates for the same speed of rotation of the cam and for the same stroke of the piston, simply by connecting one or more of the compartments to the discharge.
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR9708595A FR2765635B1 (en) | 1997-07-07 | 1997-07-07 | DIRECT FUEL INJECTION PUMP FOR A CONTROLLED IGNITION ENGINE AND INJECTION SYSTEM COMPRISING SUCH A PUMP |
FR9708595 | 1997-07-07 | ||
PCT/FR1998/001451 WO1999002851A1 (en) | 1997-07-07 | 1998-07-07 | Direct injection fuel pump for engine with controlled ignition and injection system comprising same |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0995030A1 true EP0995030A1 (en) | 2000-04-26 |
EP0995030B1 EP0995030B1 (en) | 2002-03-27 |
Family
ID=9508951
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP98936458A Expired - Lifetime EP0995030B1 (en) | 1997-07-07 | 1998-07-07 | Direct injection fuel pump for engine with controlled ignition and injection system comprising same |
Country Status (6)
Country | Link |
---|---|
US (1) | US6178951B1 (en) |
EP (1) | EP0995030B1 (en) |
JP (1) | JP2002508047A (en) |
DE (1) | DE69804460T2 (en) |
FR (1) | FR2765635B1 (en) |
WO (1) | WO1999002851A1 (en) |
Families Citing this family (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2826068B1 (en) * | 2001-06-19 | 2004-02-13 | Siemens Automotive Hydraulics | FLOW REGULATION DEVICE FOR TRANSFER FUEL PUMP |
FR2832492B1 (en) * | 2001-11-20 | 2004-02-06 | Snecma Moteurs | IMPROVEMENTS TO TURBOMACHINE INJECTORS |
US20060216177A1 (en) * | 2003-07-04 | 2006-09-28 | Warren Leslie J | Liquid pump and method for pumping a liquid that may have gas coming out of solution |
US7278443B2 (en) * | 2004-12-16 | 2007-10-09 | Diversified Dynamics Corporation | Pulsation causing valve for a plural piston pump |
US7290561B2 (en) * | 2004-12-16 | 2007-11-06 | Diversified Dynamics Corporation | Pulsation causing valve for a plural piston pump |
US20060140778A1 (en) * | 2004-12-28 | 2006-06-29 | Warren Leslie J | Reciprocating positive displacement pump for deionized water and method of cooling and lubricating therefor |
US20060239834A1 (en) * | 2005-04-20 | 2006-10-26 | Larson Steve A | Metered pulse pump |
US7552720B2 (en) * | 2007-11-20 | 2009-06-30 | Hitachi, Ltd | Fuel pump control for a direct injection internal combustion engine |
JP5051279B2 (en) * | 2009-12-21 | 2012-10-17 | 株式会社デンソー | Constant residual pressure valve |
DE102010039831B4 (en) * | 2010-08-26 | 2022-02-03 | Prominent Gmbh | Diaphragm pump and method for adjusting such |
Family Cites Families (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR1038510A (en) * | 1951-06-19 | 1953-09-29 | Fuel injection pump | |
US2960936A (en) * | 1958-07-11 | 1960-11-22 | William M Dean | Fuel injection pump |
FR1211846A (en) * | 1958-10-18 | 1960-03-18 | Hydraulic pump for agricultural sprayers | |
DE1528474B1 (en) * | 1966-03-01 | 1970-07-23 | Lewa Herbert Ott Fa | Hydraulic control device on a diaphragm pump |
US3918846A (en) * | 1973-07-19 | 1975-11-11 | Lear Motors Corp | Vapor generator feedwater pump |
US4501533A (en) * | 1979-11-15 | 1985-02-26 | Bower Jr Frank A | Apparatus for delivering liquid under pressure |
DE3706697A1 (en) * | 1987-03-02 | 1988-09-15 | Breinlich Richard Dr | High-pressure diaphragm for large discharge flow |
US5249932A (en) * | 1991-10-07 | 1993-10-05 | Erik Van Bork | Apparatus for controlling diaphragm extension in a diaphragm metering pump |
JPH062664A (en) * | 1992-06-22 | 1994-01-11 | Nippon Soken Inc | Diaphragm type pump |
JPH06173811A (en) * | 1992-10-08 | 1994-06-21 | Nippon Soken Inc | Fuel injection device |
DE4327970C2 (en) * | 1993-08-19 | 1997-07-03 | Ott Kg Lewa | Hydraulically driven diaphragm pump with mechanical diaphragm stroke limitation |
US6113361A (en) * | 1999-02-02 | 2000-09-05 | Stanadyne Automotive Corp. | Intensified high-pressure common-rail supply pump |
-
1997
- 1997-07-07 FR FR9708595A patent/FR2765635B1/en not_active Expired - Lifetime
-
1998
- 1998-07-07 DE DE69804460T patent/DE69804460T2/en not_active Expired - Lifetime
- 1998-07-07 JP JP50824999A patent/JP2002508047A/en active Pending
- 1998-07-07 US US09/462,275 patent/US6178951B1/en not_active Expired - Lifetime
- 1998-07-07 WO PCT/FR1998/001451 patent/WO1999002851A1/en active IP Right Grant
- 1998-07-07 EP EP98936458A patent/EP0995030B1/en not_active Expired - Lifetime
Non-Patent Citations (1)
Title |
---|
See references of WO9902851A1 * |
Also Published As
Publication number | Publication date |
---|---|
DE69804460T2 (en) | 2002-11-14 |
FR2765635A1 (en) | 1999-01-08 |
US6178951B1 (en) | 2001-01-30 |
JP2002508047A (en) | 2002-03-12 |
WO1999002851A1 (en) | 1999-01-21 |
EP0995030B1 (en) | 2002-03-27 |
FR2765635B1 (en) | 1999-09-03 |
DE69804460D1 (en) | 2002-05-02 |
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