EP2761163B1 - Fuel injection pump arrangement and method for operating an internal combustion engine - Google Patents
Fuel injection pump arrangement and method for operating an internal combustion engine Download PDFInfo
- Publication number
- EP2761163B1 EP2761163B1 EP12767029.7A EP12767029A EP2761163B1 EP 2761163 B1 EP2761163 B1 EP 2761163B1 EP 12767029 A EP12767029 A EP 12767029A EP 2761163 B1 EP2761163 B1 EP 2761163B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- fuel
- plunger
- hydraulic fluid
- engine
- cam
- 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.)
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- 239000000446 fuel Substances 0.000 title claims description 114
- 238000002347 injection Methods 0.000 title claims description 44
- 239000007924 injection Substances 0.000 title claims description 44
- 238000002485 combustion reaction Methods 0.000 title claims description 11
- 238000000034 method Methods 0.000 title claims description 10
- 239000012530 fluid Substances 0.000 claims description 51
- 239000007788 liquid Substances 0.000 claims description 17
- 239000010687 lubricating oil Substances 0.000 claims description 3
- 239000007789 gas Substances 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 239000010771 distillate fuel oil Substances 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 239000010763 heavy fuel oil Substances 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
Images
Classifications
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- 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
- F02M59/44—Details, components parts, or accessories not provided for in, or of interest apart from, the apparatus of groups F02M59/02 - F02M59/42; Pumps having transducers, e.g. to measure displacement of pump rack or piston
- F02M59/447—Details, components parts, or accessories not provided for in, or of interest apart from, the apparatus of groups F02M59/02 - F02M59/42; Pumps having transducers, e.g. to measure displacement of pump rack or piston means specially adapted to limit fuel delivery or to supply excess of fuel temporarily, e.g. for starting of the engine
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- 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
- F02M39/00—Arrangements of fuel-injection apparatus with respect to engines; Pump drives adapted to such arrangements
- F02M39/02—Arrangements of fuel-injection apparatus to facilitate the driving of pumps; Arrangements of fuel-injection pumps; Pump drives
-
- 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
- F02M43/00—Fuel-injection apparatus operating simultaneously on two or more fuels, or on a liquid fuel and another liquid, e.g. the other liquid being an anti-knock additive
- F02M43/02—Pumps peculiar thereto
-
- 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
- F02M59/025—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 a single piston
- F02M59/027—Unit-pumps, i.e. single piston and cylinder pump-units, e.g. for cooperating with a camshaft
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- 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
- F02M59/04—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 special arrangement of cylinders with respect to piston-driving shaft, e.g. arranged parallel to that shaft or swash-plate type pumps
- F02M59/06—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 special arrangement of cylinders with respect to piston-driving shaft, e.g. arranged parallel to that shaft or swash-plate type pumps with cylinders arranged radially to driving shaft, e.g. in V or star arrangement
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- 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
- F02M59/102—Mechanical drive, e.g. tappets or cams
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- 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
- F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
- F04B1/04—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement
- F04B1/0404—Details or component parts
- F04B1/0435—Arrangements for disconnecting the pistons from the actuated cam
Definitions
- the present invention relates to a fuel injection pump arrangement for a dual-fuel internal combustion engine according to the preamble of claim 1.
- the invention also concerns a method for operating a dual-fuel internal combustion engine that comprises a cam-driven fuel injection pump for each cylinder of the engine, as defined in the preamble of the other independent claim.
- each cylinder of the engine is provided with an own fuel injection pump that is used for pressurizing fuel when the engine is operated in a liquid fuel mode.
- Each fuel injection pump is driven by a rotating cam that moves one or more plungers inside the pump.
- the engine can utilize either an Otto combustion process or a Diesel combustion process.
- a common rail system is used for injecting a small amount of liquid pilot fuel into the cylinder or a pre-chamber. Since a common rail system is used for injecting the liquid pilot fuel, the separate fuel injection pumps of each cylinder are not needed in the gaseous fuel mode.
- This kind of engines can be used, for instance, in offshore applications and ships or at power plants.
- the engines are operated mostly on gaseous fuel, and the liquid fuel mode is only used when the gaseous fuel is not available. Therefore, the fuel injection pumps may be run most of the time unnecessarily. Due to mechanical losses, this increases fuel consumption of the engine and also leads in wear of the fuel injection pumps.
- Examples of high-pressure pumps suitable for pumping fuel are available from GB 602 199 A and US 2 612 842 A .
- An object of the present invention is to provide an improved fuel injection pump arrangement for a dual-fuel internal combustion engine.
- the characterizing features of the arrangement according to the present invention are given in the characterizing part of claim 1.
- Another object of the invention is to provide an improved method for operating a dual-fuel internal combustion engine, which engine comprises a cam-driven fuel injection pump for each cylinder of the engine.
- liquid fuel is pressurized by at least one reciprocating plunger that is in mechanical connection with a rotating cam.
- the method is characterized by the characterizing part of the other independent claim.
- the fuel injection pump arrangement comprises a pump body, at least one fuel chamber that is arranged inside the pump body, at least one reciprocating plunger that protrudes into the fuel chamber for pressurizing liquid fuel in the fuel chamber, a plunger moving mechanism for establishing mechanical connection between the plunger and a rotating cam that drives the fuel injection pump, and means for breaking the mechanical connection between the plunger and the cam when the fuel injection pump is not used for pressurizing fuel.
- the mechanical connection between the plunger of each fuel injection pump and the respective cam is broken for preventing moving of the plunger when the engine is operated on gaseous fuel.
- the fuel injection pump can be taken out of use when the engine is operated on gaseous fuel.
- fuel economy of the engine can be improved and the life cycle of the fuel injection pumps can be extended.
- the arrangement comprises a hydraulic fluid chamber and a piston that is arranged in the hydraulic fluid chamber for moving the plunger away from the cam.
- the plunger moving mechanism comprises a cam follower unit and a push rod that is arranged between the plunger and the cam follower unit, and the hydraulic fluid chamber is arranged around the push rod.
- the piston is a sleeve-like part that is arranged around the push rod.
- the hydraulic fluid is lube oil of the engine.
- the hydraulic fluid is fuel that is used in the engine.
- the arrangement comprises a hydraulic pump for pressurizing the hydraulic fluid.
- the plunger in the method is moved away from the cam by introducing hydraulic fluid into a hydraulic fluid chamber between the end of the chamber and a piston that is in mechanical connection with the plunger.
- the hydraulic fluid is pressurized by a hydraulic pump.
- the hydraulic pump is operated when the engine is operated on gaseous fuel and pressure in the hydraulic fluid chamber is below a predetermined level.
- Fig. 1 shows a fuel injection pump arrangement according to an embodiment of the invention.
- FIG 1 a fuel injection pump arrangement according to an embodiment of the present invention.
- the engine where the arrangement is used is a large dual-fuel internal combustion engine, such as a ship engine or an engine that is used for producing electricity at a power plant.
- the engine can be operated both on liquid fuel, such as light or heavy fuel oil, and gaseous fuel, such as natural gas or biogas.
- the engine is provided with one fuel injection pump for each cylinder of the engine.
- the fuel injection pumps are used when the engine is operated on liquid fuel. With a separate fuel injection pump for each cylinder of the engine, the amount of the injected fuel and the injection timing can be individually adjusted in each cylinder.
- the fuel injection pump comprises a pump body 1. Inside the pump body 1, there is a fuel chamber 10, into which liquid fuel can be introduced through fuel inlets 3 from a fuel channel 23.
- the engine is provided with a fuel supply pump for introducing the liquid fuel into the fuel chamber 10 at a relatively low pressure.
- a reciprocating plunger 2 protrudes into the fuel chamber 10 for pressurizing the fuel that is introduced into the fuel chamber 10.
- Each fuel injection pump could also be provided with two fuel chambers 10 and two plungers 2.
- the fuel injection pump is driven by a cam that is attached to a rotating camshaft (not shown).
- the fuel injection pump arrangement comprises a plunger moving mechanism 5, 11 that establishes mechanical connection between the cam and the plunger 2.
- the plunger moving mechanism 5, 11 transforms the rotating movement of the cam into the reciprocating movement of the plunger 2.
- the plunger moving mechanism comprises a cam follower unit 11 and a push rod 5 that is arranged between the cam follower unit 11 and the plunger 2.
- the cam follower unit 11 comprises a cam follower wheel 12 that follows the surface of the rotating cam.
- the push rod 5 transmits the movement of the cam follower unit 11 to the plunger 2.
- a spring 8 that is arranged around the plunger 2 pushes the plunger 2 and the push rod 5 towards the cam follower unit 11 and the cam.
- the camshaft end of the spring 8 is supported against a spring support plate 9 that is attached to the plunger 2.
- the bottom part of the fuel injection pump is provided with a second spring 13 that pushes the cam follower unit 11 against the cam of the camshaft.
- the pressurized fuel is supplied to the cylinder of the engine through a fuel outlet (not shown in Fig. 1 ) that is arranged in the upper part of the fuel chamber 10.
- each fuel injection pump arrangement is provided with means 4, 6, 7 for breaking the mechanical connection between the cam and the plunger 2 when the fuel injection pump is not used for pressurizing fuel. The reciprocating movement of the plungers 2 can thus be prevented and the fuel injection pumps can be taken out of use when the engine is operated on gaseous fuel. This reduces the fuel consumption of the engine and wear of the fuel injection pumps.
- the means for breaking the mechanical connection between the plunger 2 and the cam comprise a hydraulic fluid chamber 6, a piston 4, and means, i.e. a fluid supply line 7, for introducing hydraulic fluid into the hydraulic fluid chamber 6.
- the hydraulic fluid chamber 6 is arranged below the plunger 2 and surrounds the push rod 5.
- the piston 4 is a sleeve-like part that is arranged in the hydraulic fluid chamber 6 around the push rod 5.
- hydraulic fluid can be introduced into the hydraulic fluid chamber 6 between the piston 4 and the camshaft end of the chamber 6.
- the hydraulic fluid can be, for instance, lube oil of the engine, or fuel that is used in the engine.
- the piston 4 When the hydraulic fluid is introduced into the chamber 6 at a sufficiently high pressure, the piston 4 is moved together with the plunger 2 away from the cam. The pressure needs to be high enough to overcome the force that is created by the spring 8 that pushes the plunger 2 towards the cam.
- the inner and outer surfaces of the piston 4 are provided with seals 21, 22 for preventing leakage between the push rod 5 and the piston 4 and between the wall of the hydraulic fluid chamber 6 and the piston 4.
- a seal 20 is arranged also between the bottom aperture of the hydraulic fluid chamber 6 and the push rod 5.
- the fluid supply line 7 can be used for releasing the hydraulic fluid from the hydraulic fluid chamber 6, as in the embodiment of figure 1 , or the chamber 6 can be provided with a separate outlet.
- the engine is provided with a separate hydraulic pump 14 for pressurizing the hydraulic fluid.
- a valve 16 is arranged in the fluid supply line 7 between the hydraulic pump 14 and the hydraulic fluid chamber 6. When the valve 16 is in the position shown in the figure, the hydraulic pump 14 can be used for supplying hydraulic fluid from a tank 17 into the hydraulic fluid chamber 6.
- a check valve 15 is arranged between the hydraulic pump 14 and the valve 16 for preventing backflow to the pump 14. Therefore, the hydraulic pump 14 does not need to be operated continuously, but it can be switched on when the pressure in the fluid supply line 7 drops below a certain predetermined limit. By switching the valve 16 into a second position, hydraulic fluid can be released from the hydraulic fluid chamber 6 back into the tank 17.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Fuel-Injection Apparatus (AREA)
- Reciprocating Pumps (AREA)
Description
- The present invention relates to a fuel injection pump arrangement for a dual-fuel internal combustion engine according to the preamble of
claim 1. The invention also concerns a method for operating a dual-fuel internal combustion engine that comprises a cam-driven fuel injection pump for each cylinder of the engine, as defined in the preamble of the other independent claim. - So-called dual-fuel engines that can be operated both on gaseous and liquid fuel provide high efficiency and fuel flexibility. In certain types of large dual-fuel engines, each cylinder of the engine is provided with an own fuel injection pump that is used for pressurizing fuel when the engine is operated in a liquid fuel mode. Each fuel injection pump is driven by a rotating cam that moves one or more plungers inside the pump. When operated on gaseous fuel, the engine can utilize either an Otto combustion process or a Diesel combustion process. In the gaseous fuel mode, a common rail system is used for injecting a small amount of liquid pilot fuel into the cylinder or a pre-chamber. Since a common rail system is used for injecting the liquid pilot fuel, the separate fuel injection pumps of each cylinder are not needed in the gaseous fuel mode. This kind of engines can be used, for instance, in offshore applications and ships or at power plants. In many applications, the engines are operated mostly on gaseous fuel, and the liquid fuel mode is only used when the gaseous fuel is not available. Therefore, the fuel injection pumps may be run most of the time unnecessarily. Due to mechanical losses, this increases fuel consumption of the engine and also leads in wear of the fuel injection pumps. Examples of high-pressure pumps suitable for pumping fuel are available from
GB 602 199 A US 2 612 842 A . - An object of the present invention is to provide an improved fuel injection pump arrangement for a dual-fuel internal combustion engine. The characterizing features of the arrangement according to the present invention are given in the characterizing part of
claim 1. Another object of the invention is to provide an improved method for operating a dual-fuel internal combustion engine, which engine comprises a cam-driven fuel injection pump for each cylinder of the engine. In the fuel injection pump, liquid fuel is pressurized by at least one reciprocating plunger that is in mechanical connection with a rotating cam. The method is characterized by the characterizing part of the other independent claim. - According to the invention, the fuel injection pump arrangement comprises a pump body, at least one fuel chamber that is arranged inside the pump body, at least one reciprocating plunger that protrudes into the fuel chamber for pressurizing liquid fuel in the fuel chamber, a plunger moving mechanism for establishing mechanical connection between the plunger and a rotating cam that drives the fuel injection pump, and means for breaking the mechanical connection between the plunger and the cam when the fuel injection pump is not used for pressurizing fuel.
- In the method for operating a dual-fuel internal combustion engine in accordance with the invention, the mechanical connection between the plunger of each fuel injection pump and the respective cam is broken for preventing moving of the plunger when the engine is operated on gaseous fuel.
- With the fuel injection pump arrangement according to the invention, the fuel injection pump can be taken out of use when the engine is operated on gaseous fuel. With the arrangement and the method according to the invention, fuel economy of the engine can be improved and the life cycle of the fuel injection pumps can be extended.
- According to an embodiment of the invention, the arrangement comprises a hydraulic fluid chamber and a piston that is arranged in the hydraulic fluid chamber for moving the plunger away from the cam.
- According to another embodiment of the invention, the plunger moving mechanism comprises a cam follower unit and a push rod that is arranged between the plunger and the cam follower unit, and the hydraulic fluid chamber is arranged around the push rod. According to another embodiment of the invention, the piston is a sleeve-like part that is arranged around the push rod.
- According to another embodiment of the invention, the hydraulic fluid is lube oil of the engine. According to another embodiment of the invention, the hydraulic fluid is fuel that is used in the engine.
- According to another embodiment of the invention, the arrangement comprises a hydraulic pump for pressurizing the hydraulic fluid.
- According to an embodiment of the invention, in the method the plunger is moved away from the cam by introducing hydraulic fluid into a hydraulic fluid chamber between the end of the chamber and a piston that is in mechanical connection with the plunger.
- According to another embodiment of the invention, the hydraulic fluid is pressurized by a hydraulic pump.
- According to another embodiment of the invention, the hydraulic pump is operated when the engine is operated on gaseous fuel and pressure in the hydraulic fluid chamber is below a predetermined level.
-
Fig. 1 shows a fuel injection pump arrangement according to an embodiment of the invention. - Embodiments of the invention are now described in more detail with reference to the accompanying drawings.
- In
figure 1 is shown a fuel injection pump arrangement according to an embodiment of the present invention. The engine where the arrangement is used is a large dual-fuel internal combustion engine, such as a ship engine or an engine that is used for producing electricity at a power plant. The engine can be operated both on liquid fuel, such as light or heavy fuel oil, and gaseous fuel, such as natural gas or biogas. - The engine is provided with one fuel injection pump for each cylinder of the engine. The fuel injection pumps are used when the engine is operated on liquid fuel. With a separate fuel injection pump for each cylinder of the engine, the amount of the injected fuel and the injection timing can be individually adjusted in each cylinder. The fuel injection pump comprises a
pump body 1. Inside thepump body 1, there is afuel chamber 10, into which liquid fuel can be introduced throughfuel inlets 3 from afuel channel 23. The engine is provided with a fuel supply pump for introducing the liquid fuel into thefuel chamber 10 at a relatively low pressure. Areciprocating plunger 2 protrudes into thefuel chamber 10 for pressurizing the fuel that is introduced into thefuel chamber 10. Each fuel injection pump could also be provided with twofuel chambers 10 and twoplungers 2. In that case, one of theplungers 2 can be used for adjusting the injection timing and theother plunger 2 can be used for adjusting the amount of the injected fuel. The fuel injection pump is driven by a cam that is attached to a rotating camshaft (not shown). The fuel injection pump arrangement comprises aplunger moving mechanism plunger 2. Theplunger moving mechanism plunger 2. In the embodiment offigure 1 , the plunger moving mechanism comprises acam follower unit 11 and apush rod 5 that is arranged between thecam follower unit 11 and theplunger 2. Thecam follower unit 11 comprises acam follower wheel 12 that follows the surface of the rotating cam. Thepush rod 5 transmits the movement of thecam follower unit 11 to theplunger 2. Aspring 8 that is arranged around theplunger 2 pushes theplunger 2 and thepush rod 5 towards thecam follower unit 11 and the cam. The camshaft end of thespring 8 is supported against a spring support plate 9 that is attached to theplunger 2. The bottom part of the fuel injection pump is provided with asecond spring 13 that pushes thecam follower unit 11 against the cam of the camshaft. The pressurized fuel is supplied to the cylinder of the engine through a fuel outlet (not shown inFig. 1 ) that is arranged in the upper part of thefuel chamber 10. The injection of the liquid fuel and the adjustment of the injection timing and the amount of the injected fuel by arack 18 and apinion 19 work in a conventional manner and are therefore not described in more detail here. - When the engine is operated on gaseous fuel, a small amount of liquid pilot fuel is used for igniting the gaseous fuel. For injecting the pilot fuel into the cylinders of the engine or into pre-chambers, the engine is provided with a common rail system. The fuel injection pumps are therefore not needed when the engine is in the gas mode. Each fuel injection pump arrangement is provided with
means plunger 2 when the fuel injection pump is not used for pressurizing fuel. The reciprocating movement of theplungers 2 can thus be prevented and the fuel injection pumps can be taken out of use when the engine is operated on gaseous fuel. This reduces the fuel consumption of the engine and wear of the fuel injection pumps. - In the embodiment of
figure 1 , the means for breaking the mechanical connection between theplunger 2 and the cam comprise a hydraulicfluid chamber 6, apiston 4, and means, i.e. afluid supply line 7, for introducing hydraulic fluid into the hydraulicfluid chamber 6. The hydraulicfluid chamber 6 is arranged below theplunger 2 and surrounds thepush rod 5. Thepiston 4 is a sleeve-like part that is arranged in the hydraulicfluid chamber 6 around thepush rod 5. Through thefluid supply line 7, hydraulic fluid can be introduced into the hydraulicfluid chamber 6 between thepiston 4 and the camshaft end of thechamber 6. The hydraulic fluid can be, for instance, lube oil of the engine, or fuel that is used in the engine. When the hydraulic fluid is introduced into thechamber 6 at a sufficiently high pressure, thepiston 4 is moved together with theplunger 2 away from the cam. The pressure needs to be high enough to overcome the force that is created by thespring 8 that pushes theplunger 2 towards the cam. The inner and outer surfaces of thepiston 4 are provided withseals push rod 5 and thepiston 4 and between the wall of the hydraulicfluid chamber 6 and thepiston 4. Aseal 20 is arranged also between the bottom aperture of the hydraulicfluid chamber 6 and thepush rod 5. - When the engine is running in the gas mode, hydraulic fluid is introduced into the hydraulic
fluid chamber 6. Thepiston 4 and theplunger 2 are thus pushed away from the cam. Thepush rod 5 moves together with thepiston 4 and theplunger 2 and is thus separated from thecam follower unit 11. Thesecond spring 13 keeps thecam follower unit 11 in contact with the cam. The pressure in the hydraulicfluid chamber 6 is maintained until the engine is to be operated on liquid fuel again. Before operating the engine again on liquid fuel, hydraulic fluid is released from the hydraulicfluid chamber 6. Thepiston 4 and theplunger 2 can thus return to their original positions and the mechanical connection between theplunger 2 and the cam is re-established. Thefluid supply line 7 can be used for releasing the hydraulic fluid from the hydraulicfluid chamber 6, as in the embodiment offigure 1 , or thechamber 6 can be provided with a separate outlet. In the embodiment offigure 1 , the engine is provided with a separatehydraulic pump 14 for pressurizing the hydraulic fluid. Avalve 16 is arranged in thefluid supply line 7 between thehydraulic pump 14 and the hydraulicfluid chamber 6. When thevalve 16 is in the position shown in the figure, thehydraulic pump 14 can be used for supplying hydraulic fluid from atank 17 into the hydraulicfluid chamber 6. Acheck valve 15 is arranged between thehydraulic pump 14 and thevalve 16 for preventing backflow to thepump 14. Therefore, thehydraulic pump 14 does not need to be operated continuously, but it can be switched on when the pressure in thefluid supply line 7 drops below a certain predetermined limit. By switching thevalve 16 into a second position, hydraulic fluid can be released from the hydraulicfluid chamber 6 back into thetank 17. - It will be appreciated by a person skilled in the art that the invention is not limited to the embodiments described above, but may vary within the scope of the appended claims. For instance, instead of lifting only the plunger for breaking the mechanical connection between the cam and the plunger, also the cam follower can be lifted from the cam.
Claims (9)
- A fuel injection pump arrangement for a dual-fuel internal combustion engine, which fuel injection pump arrangement comprises- a pump body (1),- at least one fuel chamber (10) that is arranged inside the pump body (1),- at least one reciprocating plunger (2) that protrudes into the fuel chamber (10) for pressurizing liquid fuel in the chamber (10), and- a plunger moving mechanism (5, 11) for establishing mechanical connection between the plunger (2) and a rotating cam that drives the fuel injection pump, characterized in that the arrangement further comprises a hydraulic fluid chamber (6), a piston (4) that is arranged in the hydraulic fluid chamber (6), and means (7) for introducing hydraulic fluid into the hydraulic fluid chamber (6) for moving the piston (4) and the plunger (2) away from the cam for breaking the mechanical connection between the plunger (2) and the cam when the fuel injection pump is not used for pressurizing fuel.
- An arrangement according to claim 1, characterized in that the plunger moving mechanism comprises a cam follower unit (11) and a push rod (5) that is arranged between the plunger (2) and the cam follower unit (11), and that the hydraulic fluid chamber (6) is arranged around the push rod (5).
- An arrangement according to claim 2, characterized in that the piston (4) is a sleeve-like part that is arranged around the push rod (5).
- An arrangement according to any of claims 1-3, characterized in that the hydraulic fluid is lube oil of the engine.
- An arrangement according to any of claims 1-3, characterized in that the hydraulic fluid is fuel that is used in the engine.
- An arrangement according to any of the preceding claims, characterized in that the arrangement comprises a hydraulic pump (14) for pressurizing the hydraulic fluid.
- A method for operating a dual-fuel internal combustion engine, which engine comprises a cam-driven fuel injection pump for each cylinder of the engine, in which fuel injection pump liquid fuel is pressurized by at least one reciprocating plunger (2) that is in mechanical connection with a rotating cam, characterized in that when the engine is operated on gaseous fuel, the mechanical connection between the plunger (2) of each fuel injection pump and the respective cam is broken for preventing moving of the plunger (2) by introducing hydraulic fluid into a hydraulic fluid chamber (6) between the end of the chamber (6) and a piston (4) that is in mechanical connection with the plunger (2) for moving the piston (4) and the plunger (2) away from the cam.
- A method according to claim 7, characterized in that the hydraulic fluid is pressurized by a hydraulic pump.
- A method according to claim 8, characterized in that the hydraulic pump is operated when the engine is operated on gaseous fuel and pressure in the hydraulic fluid chamber (6) is below a predetermined level.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FI20115954A FI124006B (en) | 2011-09-30 | 2011-09-30 | Fuel injection pump arrangement and method for operating an internal combustion engine |
PCT/FI2012/050886 WO2013045756A1 (en) | 2011-09-30 | 2012-09-13 | Fuel injection pump arrangement and method for operating an internal combustion engine |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2761163A1 EP2761163A1 (en) | 2014-08-06 |
EP2761163B1 true EP2761163B1 (en) | 2015-07-29 |
Family
ID=44718859
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP12767029.7A Active EP2761163B1 (en) | 2011-09-30 | 2012-09-13 | Fuel injection pump arrangement and method for operating an internal combustion engine |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP2761163B1 (en) |
KR (1) | KR101791732B1 (en) |
CN (1) | CN104755744B (en) |
FI (1) | FI124006B (en) |
WO (1) | WO2013045756A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP4163494A4 (en) * | 2020-06-03 | 2024-04-03 | Hyun Dai Heavy Ind Co Ltd | Gas supply pump for ship dual fuel engine |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
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DE102013207393A1 (en) * | 2013-04-24 | 2014-10-30 | Robert Bosch Gmbh | Piston pump, in particular high-pressure pump for a fuel system for an internal combustion engine |
DE102015219036A1 (en) * | 2015-10-01 | 2017-04-06 | Robert Bosch Gmbh | Method and device for operating a high-pressure pump for an internal combustion engine |
JP6837327B2 (en) * | 2016-12-13 | 2021-03-03 | 三菱重工業株式会社 | Fuel injection pump, fuel injection device, internal combustion engine |
WO2018178500A1 (en) * | 2017-03-29 | 2018-10-04 | Wärtsilä Finland Oy | A fuel pump for supplying fuel to an internal combustion piston engine |
CN109340001B (en) * | 2018-12-13 | 2021-03-12 | 单进才 | Dual-fuel mixed servo device for engine |
CN114704410B (en) * | 2022-04-27 | 2023-02-03 | 中船动力研究院有限公司 | Dual-fuel pressurization injection apparatus |
KR102616805B1 (en) | 2023-05-08 | 2023-12-21 | 주식회사 이케이전력 | IoT-based corrosion pre-detection switchgear preventive maintenance system |
Family Cites Families (10)
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GB602199A (en) * | 1944-10-28 | 1948-05-21 | Georges Pauget | Improvements in high pressure radial piston pumps for liquids |
US2612842A (en) | 1946-11-13 | 1952-10-07 | Worthington Corp | Fuel injection pump |
GB825136A (en) * | 1956-07-09 | 1959-12-09 | Napier & Son Ltd | Timing of fuel injection pumps |
JPS6030466A (en) * | 1983-07-29 | 1985-02-16 | Toyota Motor Corp | Duplex fuel feed pump |
JPH04370364A (en) * | 1991-06-17 | 1992-12-22 | Mitsubishi Motors Corp | Fuel injection pump |
JP2952746B2 (en) * | 1994-07-05 | 1999-09-27 | 株式会社クボタ | Diesel engine fuel injection system |
DE19531873C1 (en) * | 1995-08-30 | 1996-11-07 | Daimler Benz Ag | Fuel high pressure pump for internal combustion engine |
DE10359974A1 (en) * | 2003-12-18 | 2007-10-18 | Robert Bosch Gmbh | Method and device for operating an internal combustion engine with a fuel-powered internal combustion engine |
ATE549498T1 (en) * | 2008-07-07 | 2012-03-15 | Impco Technologies B V | DUAL FUEL INJECTION SYSTEM AND MOTOR VEHICLE HAVING SUCH AN INJECTION SYSTEM |
JP2011026971A (en) * | 2009-07-22 | 2011-02-10 | Honda Motor Co Ltd | High pressure fuel pump and internal combustion engine having the same |
-
2011
- 2011-09-30 FI FI20115954A patent/FI124006B/en active IP Right Grant
-
2012
- 2012-09-13 WO PCT/FI2012/050886 patent/WO2013045756A1/en active Application Filing
- 2012-09-13 EP EP12767029.7A patent/EP2761163B1/en active Active
- 2012-09-13 KR KR1020147008667A patent/KR101791732B1/en active IP Right Grant
- 2012-09-13 CN CN201280045161.1A patent/CN104755744B/en active Active
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP4163494A4 (en) * | 2020-06-03 | 2024-04-03 | Hyun Dai Heavy Ind Co Ltd | Gas supply pump for ship dual fuel engine |
Also Published As
Publication number | Publication date |
---|---|
CN104755744A (en) | 2015-07-01 |
KR20140069080A (en) | 2014-06-09 |
FI124006B (en) | 2014-01-31 |
KR101791732B1 (en) | 2017-10-30 |
EP2761163A1 (en) | 2014-08-06 |
FI20115954A (en) | 2013-03-31 |
FI20115954A0 (en) | 2011-09-30 |
WO2013045756A1 (en) | 2013-04-04 |
CN104755744B (en) | 2017-03-29 |
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