EP0994251A1 - Fuel injection system - Google Patents
Fuel injection system Download PDFInfo
- Publication number
- EP0994251A1 EP0994251A1 EP99308004A EP99308004A EP0994251A1 EP 0994251 A1 EP0994251 A1 EP 0994251A1 EP 99308004 A EP99308004 A EP 99308004A EP 99308004 A EP99308004 A EP 99308004A EP 0994251 A1 EP0994251 A1 EP 0994251A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- fuel
- delivery chamber
- control valve
- pressure
- fuel system
- 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.)
- Withdrawn
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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
- F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
- F02M63/0003—Fuel-injection apparatus having a cyclically-operated valve for connecting a pressure source, e.g. constant pressure pump or accumulator, to an injection valve held closed mechanically, e.g. by springs, and automatically opened by fuel pressure
- F02M63/0007—Fuel-injection apparatus having a cyclically-operated valve for connecting a pressure source, e.g. constant pressure pump or accumulator, to an injection valve held closed mechanically, e.g. by springs, and automatically opened by fuel pressure using electrically actuated valves
Definitions
- This invention relates to a fuel system for use in supplying fuel under pressure to a combustion space of a compression ignition internal combustion engine.
- the invention relates to a fuel system of the common rail type.
- a plurality of individually actuable fuel injectors are connected to a common rail which is charged with fuel to a high pressure by a suitable high pressure fuel pump.
- Each injector includes a control valve which controls communication between the common rail and a delivery chamber of the injector defined, in part, by surfaces of a needle of the injector which are orientated such that the application of fuel under pressure to the delivery chamber applies a force to the needle urging the needle away from a seating to allow the delivery of fuel to one or more outlet openings.
- the control valve is typically arranged such that when the delivery chamber is not in communication with the common rail, the delivery chamber communicates, through the control valve, with a low pressure drain reservoir.
- Such an arrangement is disadvantageous in that repressurization of the passages between the control valve and the delivery chamber, and the delivery chamber itself, must occur before a subsequent injection can take place, and as a result the system is relatively inefficient. More importantly, the level to which these parts of the injector are depressurized between injections may not be consistent. Indeed, the passages between the control valve and the delivery chamber may be left only partially full of fuel between injections. As a result, when a subsequent injection is to take place, the length of time taken to repressurize these parts of the injector may vary leading to difficulties in accurately controlling the operation of the injector, particularly control of injection quantity and timing.
- a fuel system of the type described hereinbefore further comprising a pressure regulator arranged to hold the fuel pressure in the delivery chamber at a predetermined value when the control valve occupies a position in which communication between the common rail and the delivery chamber is broken.
- the pressure regulator preferably takes the form of a spring biased non-return valve located, in use, between the control valve and a low pressure drain reservoir.
- the spring used to bias the non-return valve to a closed position together with the exposed surface area of the valve element of the valve govern the pressure at which the delivery chamber is held between injections.
- a fuel injector for use in a fuel system comprising a control valve for controlling communication between a source of pressurised fuel and a delivery chamber forming part of the fuel injector, the fuel injector comprising a pressure regulator arranged to hold the fuel pressure in the delivery chamber at a predetermined value when the control valve of the fuel system occupies a position in which communication between the fuel source and the delivery chamber is broken.
- the fuel system illustrated in the accompanying drawing is intended for use in supplying fuel to a compression ignition internal combustion engine and comprises a common rail 10 arranged to be charged with fuel to a high pressure by an appropriate fuel pump.
- the common rail 10 is connected through passages 12 (only one of which is shown) to a plurality of fuel injectors 13 (only one of which is shown).
- Each fuel injector 13 includes a nozzle body 14 provided with a blind bore within which a needle 15 is slidable.
- the needle 15 and bore together define a delivery chamber 16.
- the needle 15 is engageable with a seating to control communication between the delivery chamber 16 and a plurality of outlet openings 17 located downstream of the seating.
- the needle 15 includes thrust surfaces exposed to the fuel pressure within the delivery chamber 16 and orientated such that the application of fuel under high pressure to the delivery chamber 16 applies a force to the needle 15, urging the needle 15 away from its seating.
- the end of the needle 15 remote from the seating engages a spring abutment member 18 which, in turn, engages an end of a helical compression spring 19, the spring 19 applying a force to the needle 15, urging the needle 15 towards its seating.
- the delivery chamber 16 communicates through a series of drillings formed in the various parts of the injector which together define a supply passage 20 with a control valve 21, for example taking the form of an electromagnetically actuable valve including a valve member 22 (illustrated diagrammatically in the drawing) which is moveable against the action of a spring 23.
- the control valve 21 is moveable between a first position (shown in the drawing), in which the supply passage 20 communicates through the control valve 21 with a passage 24, and a second, alternative position in which the common rail 10 communicates through the passage 12 and the control valve 21 with the supply passage 20 to apply fuel under high pressure to the delivery chamber 16.
- the passage 24 includes a first flow restrictor 25 which limits the rate at which fuel is able to flow along the passage 24, and a pressure regulator 26 which takes the form of a spring biased non-return valve including a valve member 27 biased into engagement with a seating by a helical compression spring 28.
- the passage 24 further includes a second flow restrictor 29 located downstream of the pressure regulator 26. In practice, one or other of the flow restrictors 25, 29 may be omitted. Downstream of the second flow restrictor 29, the passage 24 communicates with a low pressure drain reservoir 30.
- the delivery chamber 16 communicates through the supply passage 20 and the control valve 21 with the passage 24.
- the flow restrictors 25, 29 limit the rate at which fuel is able to escape along the passage 24 from the injector towards the drain reservoir 30.
- the pressure regulator 26 acts to control the fuel pressure remaining within the delivery chamber 16, holding the fuel pressure within the delivery chamber 16 at a level determined by the spring 28 and the exposed surface area of the valve element 27. The pressure within the delivery chamber 16 is therefore held at a predetermined level which is greater than the fuel pressure within the drain reservoir 30.
- the fuel pressure within the delivery chamber 16 is insufficient to lift the valve needle 15 away from its seating against the action of the spring 19, thus injection of fuel is not taking place.
- the control valve 21 When injection of fuel is to commence, the control valve 21 is energized to move the valve member thereof against the action of the spring 23, moving the valve member to its alternative position. In this position, the communication between the supply passage 20 and the passage 24 is broken, and instead the common rail communicates through the passage 12 with the delivery chamber 16. As a result, the delivery chamber 16 is pressurized and a point will be reached beyond which the fuel pressure within the delivery chamber 16 is sufficient to lift the needle 15 away from its seating against the action of the spring 19, thus permitting fuel to flow past the seating to the outlet openings 17. As a result, injection of fuel takes place.
- control valve 21 is controlled to move the valve member thereof to the position shown, thus breaking the communication between the common rail 10 and the delivery chamber 16, and instead permitting communication between the delivery chamber 16 and the passage 24.
- fuel is able to flow at a rate governed by the first and second flow restrictors 25, 29 towards the low pressure drain reservoir 30, through the pressure regulator 26.
- Such flow of fuel reduces the pressure within the delivery chamber 16, and a point will be reached beyond which the fuel pressure within the delivery chamber 16 is insufficient to hold the valve needle 15 away from its seating, and the valve needle 15 will therefore move under the action of the spring 19 into engagement with its seating, terminating the flow of fuel towards the outlet openings 17, and thus terminating injection.
- the pressure regulator 26 is illustrated as forming part of the fuel injector. It will be appreciated, however, that the pressure regulator could be located elsewhere within the fuel system, for example externally of the injector, the pressure regulator being located between an outlet of the control valve and the low pressure drain reservoir.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fuel-Injection Apparatus (AREA)
Abstract
A fuel system comprising a fuel injector having a delivery chamber (16) for
fuel and a valve needle (15) engageable with a seating to control fuel delivery
through an outlet opening (17). The fuel system includes a control valve
(21), for controlling communication between a source of pressurised fuel (10)
and the delivery chamber (16), and a pressure regulator (26), the pressure
regulator being arranged to hold the fuel pressure in the delivery chamber
(16) at a predetermined value when the control valve (21) occupies a position
in which communication between the source (10) and the delivery chamber
(16) is broken.
Description
- This invention relates to a fuel system for use in supplying fuel under pressure to a combustion space of a compression ignition internal combustion engine. In particular, the invention relates to a fuel system of the common rail type.
- In a known common rail system, a plurality of individually actuable fuel injectors are connected to a common rail which is charged with fuel to a high pressure by a suitable high pressure fuel pump. Each injector includes a control valve which controls communication between the common rail and a delivery chamber of the injector defined, in part, by surfaces of a needle of the injector which are orientated such that the application of fuel under pressure to the delivery chamber applies a force to the needle urging the needle away from a seating to allow the delivery of fuel to one or more outlet openings. The control valve is typically arranged such that when the delivery chamber is not in communication with the common rail, the delivery chamber communicates, through the control valve, with a low pressure drain reservoir.
- Such an arrangement is disadvantageous in that repressurization of the passages between the control valve and the delivery chamber, and the delivery chamber itself, must occur before a subsequent injection can take place, and as a result the system is relatively inefficient. More importantly, the level to which these parts of the injector are depressurized between injections may not be consistent. Indeed, the passages between the control valve and the delivery chamber may be left only partially full of fuel between injections. As a result, when a subsequent injection is to take place, the length of time taken to repressurize these parts of the injector may vary leading to difficulties in accurately controlling the operation of the injector, particularly control of injection quantity and timing.
- According to a first aspect of the present invention there is provided a fuel system of the type described hereinbefore, further comprising a pressure regulator arranged to hold the fuel pressure in the delivery chamber at a predetermined value when the control valve occupies a position in which communication between the common rail and the delivery chamber is broken.
- The pressure regulator preferably takes the form of a spring biased non-return valve located, in use, between the control valve and a low pressure drain reservoir. In such an arrangement, the spring used to bias the non-return valve to a closed position together with the exposed surface area of the valve element of the valve govern the pressure at which the delivery chamber is held between injections.
- The use of such a pressure regulator results in the fuel system operating more consistently, thus control of the injector can be improved. Further, less fuel is permitted to escape to the low pressure drain reservoir, thus the efficiency of the fuel system is improved.
- According to a second aspect of the present invention there is provided a fuel injector for use in a fuel system comprising a control valve for controlling communication between a source of pressurised fuel and a delivery chamber forming part of the fuel injector, the fuel injector comprising a pressure regulator arranged to hold the fuel pressure in the delivery chamber at a predetermined value when the control valve of the fuel system occupies a position in which communication between the fuel source and the delivery chamber is broken.
- The invention will further be described, by way of example, with reference to the accompanying drawing which is a diagrammatic view of a fuel system in accordance with an embodiment of the invention.
- The fuel system illustrated in the accompanying drawing is intended for use in supplying fuel to a compression ignition internal combustion engine and comprises a
common rail 10 arranged to be charged with fuel to a high pressure by an appropriate fuel pump. Thecommon rail 10 is connected through passages 12 (only one of which is shown) to a plurality of fuel injectors 13 (only one of which is shown). Eachfuel injector 13 includes anozzle body 14 provided with a blind bore within which aneedle 15 is slidable. Theneedle 15 and bore together define a delivery chamber 16. Theneedle 15 is engageable with a seating to control communication between the delivery chamber 16 and a plurality ofoutlet openings 17 located downstream of the seating. Theneedle 15 includes thrust surfaces exposed to the fuel pressure within the delivery chamber 16 and orientated such that the application of fuel under high pressure to the delivery chamber 16 applies a force to theneedle 15, urging theneedle 15 away from its seating. - The end of the
needle 15 remote from the seating engages aspring abutment member 18 which, in turn, engages an end of ahelical compression spring 19, thespring 19 applying a force to theneedle 15, urging theneedle 15 towards its seating. - The delivery chamber 16 communicates through a series of drillings formed in the various parts of the injector which together define a
supply passage 20 with acontrol valve 21, for example taking the form of an electromagnetically actuable valve including a valve member 22 (illustrated diagrammatically in the drawing) which is moveable against the action of aspring 23. Thecontrol valve 21 is moveable between a first position (shown in the drawing), in which thesupply passage 20 communicates through thecontrol valve 21 with apassage 24, and a second, alternative position in which thecommon rail 10 communicates through thepassage 12 and thecontrol valve 21 with thesupply passage 20 to apply fuel under high pressure to the delivery chamber 16. - The
passage 24 includes afirst flow restrictor 25 which limits the rate at which fuel is able to flow along thepassage 24, and apressure regulator 26 which takes the form of a spring biased non-return valve including avalve member 27 biased into engagement with a seating by ahelical compression spring 28. Thepassage 24 further includes asecond flow restrictor 29 located downstream of thepressure regulator 26. In practice, one or other of theflow restrictors second flow restrictor 29, thepassage 24 communicates with a lowpressure drain reservoir 30. - In use, in the position shown, the delivery chamber 16 communicates through the
supply passage 20 and thecontrol valve 21 with thepassage 24. The flow restrictors 25, 29 limit the rate at which fuel is able to escape along thepassage 24 from the injector towards thedrain reservoir 30. Thepressure regulator 26 acts to control the fuel pressure remaining within the delivery chamber 16, holding the fuel pressure within the delivery chamber 16 at a level determined by thespring 28 and the exposed surface area of thevalve element 27. The pressure within the delivery chamber 16 is therefore held at a predetermined level which is greater than the fuel pressure within thedrain reservoir 30. The fuel pressure within the delivery chamber 16 is insufficient to lift thevalve needle 15 away from its seating against the action of thespring 19, thus injection of fuel is not taking place. - When injection of fuel is to commence, the
control valve 21 is energized to move the valve member thereof against the action of thespring 23, moving the valve member to its alternative position. In this position, the communication between thesupply passage 20 and thepassage 24 is broken, and instead the common rail communicates through thepassage 12 with the delivery chamber 16. As a result, the delivery chamber 16 is pressurized and a point will be reached beyond which the fuel pressure within the delivery chamber 16 is sufficient to lift theneedle 15 away from its seating against the action of thespring 19, thus permitting fuel to flow past the seating to theoutlet openings 17. As a result, injection of fuel takes place. - It will be appreciated that as the delivery chamber 16 and the
supply passage 20 were pressurised to a level greater than that of thereservoir 30 prior to switching of thecontrol valve 21, commencement of injection occurs relatively quickly after switching of thecontrol valve 21, less time being required to re-pressurise thesupply passage 20 and the delivery chamber 16. Further, and more importantly, as thesupply passage 20 is pressurized to a consistent level, the injector can be controlled relatively accurately. - In order to terminate injection, the
control valve 21 is controlled to move the valve member thereof to the position shown, thus breaking the communication between thecommon rail 10 and the delivery chamber 16, and instead permitting communication between the delivery chamber 16 and thepassage 24. As a result, fuel is able to flow at a rate governed by the first andsecond flow restrictors pressure drain reservoir 30, through thepressure regulator 26. Such flow of fuel reduces the pressure within the delivery chamber 16, and a point will be reached beyond which the fuel pressure within the delivery chamber 16 is insufficient to hold thevalve needle 15 away from its seating, and thevalve needle 15 will therefore move under the action of thespring 19 into engagement with its seating, terminating the flow of fuel towards theoutlet openings 17, and thus terminating injection. - After the termination of injection, fuel continues to flow along the
passage 24, lowering the pressure within the delivery chamber 16 and thesupply passage 20 until a point is reached beyond which the fuel pressure within the delivery chamber 16 and the passages in communication therewith is insufficient to hold thevalve element 27 of thepressure regulator 26 away from its seating against the action of thespring 28. Once this point is reached, thevalve element 27 will move into engagement with its seating, under the action of thespring 28 thus terminating the flow of fuel towards the lowpressure drain reservoir 30, and holding the delivery chamber 16 and supplypassage 20 at a fuel pressure insufficient to cause injection, but greater than that of the fuel within the lowpressure drain reservoir 30. - In the accompanying drawing, the
pressure regulator 26 is illustrated as forming part of the fuel injector. It will be appreciated, however, that the pressure regulator could be located elsewhere within the fuel system, for example externally of the injector, the pressure regulator being located between an outlet of the control valve and the low pressure drain reservoir.
Claims (9)
- A fuel system comprising a fuel injector having a delivery chamber (16) for fuel and a valve needle (15) engageable with a seating to control fuel delivery through an outlet opening (17), a control valve (21) for controlling communication between a source of pressurised fuel (10) and the delivery chamber (16), characterised in that the fuel system further comprises a pressure regulator (26) arranged to hold the fuel pressure in the delivery chamber (16) at a predetermined value when the control valve (21) occupies a position in which communication between the source (10) and the delivery chamber (16) is broken.
- The fuel system as claimed in Claim 1, wherein the pressure regulator (26) forms part of the fuel injector.
- The fuel system as claimed in Claim 1, wherein the pressure regulator (26) is located externally of the fuel injector.
- The fuel system as claimed in any of Claims 1 to 3, wherein the pressure regulator (26) takes the form of a spring biased non-return valve (27, 28).
- The fuel system as claimed in any of Claims 1 to 4, wherein the pressure regulator (26) is located in a flow path (24) between the control valve (21) and a low pressure drain reservoir (30).
- The fuel system as claimed in Claim 5, wherein the flow path (24) includes one or more flow restrictors (25, 29) for limiting the rate of flow of fuel from the delivery chamber (16) to the low pressure drain reservoir (30), in use.
- The fuel system as claimed in any of Claims 1 to 6, wherein the control valve (21) takes the form of an electromagnetically operable valve.
- The fuel system as claimed in any of Claims 1 to 7, wherein the source (10) is a common rail.
- A fuel injector for use in a fuel system comprising a control valve (21) for controlling communication between a source of pressurised fuel (10) and a delivery chamber (16) forming part of the fuel injector, characterised in that the fuel injector comprises a pressure regulator (26) arranged to hold the fuel pressure in the delivery chamber (16) at a predetermined value when the control valve (21) of the fuel system occupies a position in which communication between the fuel source (10) and the delivery chamber (16) is broken.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GBGB9822653.3A GB9822653D0 (en) | 1998-10-17 | 1998-10-17 | Fuel system |
GB9822653 | 1998-10-17 |
Publications (1)
Publication Number | Publication Date |
---|---|
EP0994251A1 true EP0994251A1 (en) | 2000-04-19 |
Family
ID=10840735
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP99308004A Withdrawn EP0994251A1 (en) | 1998-10-17 | 1999-10-11 | Fuel injection system |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP0994251A1 (en) |
GB (1) | GB9822653D0 (en) |
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10046662A1 (en) * | 2000-09-20 | 2002-04-04 | Bosch Gmbh Robert | Control system, for pressurised fluid injection, has pressure valve to generate pressure in dosing valve for supply and two stage return lines. |
DE10157411A1 (en) * | 2001-11-23 | 2003-06-26 | Bosch Gmbh Robert | High pressure fuel injector |
DE10164395A1 (en) * | 2001-12-28 | 2003-07-17 | Bosch Gmbh Robert | Fuel injection device for IC engine has leakage channel connecting control pressure space for valve piston to discharge bore |
WO2005001280A1 (en) * | 2003-06-21 | 2005-01-06 | Robert Bosch Gmbh | Fuel-injection system with reduced pressure pulsations in the return rail |
FR2868482A1 (en) * | 2004-03-30 | 2005-10-07 | Bosch Gmbh Robert | Fuel injector for e.g. diesel engine, has piston that is guided in tight manner into injector body to decouple spring chamber, and acts as valve blocking unit to release fluid stream between pressure chamber and pipe |
DE102008014250A1 (en) * | 2008-03-13 | 2009-09-17 | Man Diesel Se | Fuel supply system of an internal combustion engine |
DE102008044743A1 (en) * | 2008-08-28 | 2010-03-04 | Continental Automotive Gmbh | Injection valve and fluid delivery system with injection valve |
EP2105604A3 (en) * | 2008-03-27 | 2010-11-17 | Volkswagen Ag | Fuel injection system for a combustion engine |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3044254A1 (en) * | 1980-11-25 | 1982-06-24 | M.A.N. Maschinenfabrik Augsburg-Nürnberg AG, 8900 Augsburg | IC engine fuel injection system - has high and low pressure stores, controlled valve, buffer and throttles to increase flow at each injection |
GB2136884A (en) * | 1983-03-19 | 1984-09-26 | Orange Gmbh | Fuel-injection device for an internal-combustion engine |
GB2275307A (en) * | 1993-02-18 | 1994-08-24 | Bosch Gmbh Robert | I.c.engine high pressure distributor fuel injection system |
DE19512730C1 (en) * | 1995-04-05 | 1996-08-29 | Mtu Friedrichshafen Gmbh | Fuel injection system for IC engine |
-
1998
- 1998-10-17 GB GBGB9822653.3A patent/GB9822653D0/en not_active Ceased
-
1999
- 1999-10-11 EP EP99308004A patent/EP0994251A1/en not_active Withdrawn
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3044254A1 (en) * | 1980-11-25 | 1982-06-24 | M.A.N. Maschinenfabrik Augsburg-Nürnberg AG, 8900 Augsburg | IC engine fuel injection system - has high and low pressure stores, controlled valve, buffer and throttles to increase flow at each injection |
GB2136884A (en) * | 1983-03-19 | 1984-09-26 | Orange Gmbh | Fuel-injection device for an internal-combustion engine |
GB2275307A (en) * | 1993-02-18 | 1994-08-24 | Bosch Gmbh Robert | I.c.engine high pressure distributor fuel injection system |
DE19512730C1 (en) * | 1995-04-05 | 1996-08-29 | Mtu Friedrichshafen Gmbh | Fuel injection system for IC engine |
Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10046662A1 (en) * | 2000-09-20 | 2002-04-04 | Bosch Gmbh Robert | Control system, for pressurised fluid injection, has pressure valve to generate pressure in dosing valve for supply and two stage return lines. |
DE10046662B4 (en) * | 2000-09-20 | 2004-09-30 | Robert Bosch Gmbh | Fuel injection valve with a pressure control valve |
DE10157411A1 (en) * | 2001-11-23 | 2003-06-26 | Bosch Gmbh Robert | High pressure fuel injector |
DE10164395A1 (en) * | 2001-12-28 | 2003-07-17 | Bosch Gmbh Robert | Fuel injection device for IC engine has leakage channel connecting control pressure space for valve piston to discharge bore |
WO2005001280A1 (en) * | 2003-06-21 | 2005-01-06 | Robert Bosch Gmbh | Fuel-injection system with reduced pressure pulsations in the return rail |
FR2868482A1 (en) * | 2004-03-30 | 2005-10-07 | Bosch Gmbh Robert | Fuel injector for e.g. diesel engine, has piston that is guided in tight manner into injector body to decouple spring chamber, and acts as valve blocking unit to release fluid stream between pressure chamber and pipe |
DE102008014250A1 (en) * | 2008-03-13 | 2009-09-17 | Man Diesel Se | Fuel supply system of an internal combustion engine |
EP2105604A3 (en) * | 2008-03-27 | 2010-11-17 | Volkswagen Ag | Fuel injection system for a combustion engine |
DE102008044743A1 (en) * | 2008-08-28 | 2010-03-04 | Continental Automotive Gmbh | Injection valve and fluid delivery system with injection valve |
Also Published As
Publication number | Publication date |
---|---|
GB9822653D0 (en) | 1998-12-09 |
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