EP2761163A1 - 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

Info

Publication number
EP2761163A1
EP2761163A1 EP12767029.7A EP12767029A EP2761163A1 EP 2761163 A1 EP2761163 A1 EP 2761163A1 EP 12767029 A EP12767029 A EP 12767029A EP 2761163 A1 EP2761163 A1 EP 2761163A1
Authority
EP
European Patent Office
Prior art keywords
fuel
plunger
hydraulic fluid
engine
fuel 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
Application number
EP12767029.7A
Other languages
German (de)
French (fr)
Other versions
EP2761163B1 (en
Inventor
Esa Ylivainio
Matti Koivunen
Tom Nordman
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Wartsila Finland Oy
Original Assignee
Wartsila Finland Oy
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Wartsila Finland Oy filed Critical Wartsila Finland Oy
Publication of EP2761163A1 publication Critical patent/EP2761163A1/en
Application granted granted Critical
Publication of EP2761163B1 publication Critical patent/EP2761163B1/en
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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
    • F02M59/44—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
    • 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
    • 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
    • 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
    • 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
    • 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
    • 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 inter- 5 nal 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
  • the engine When operated on gaseous fuel, the engine can utilize either an Otto combustion process or a Diesel combustion process.
  • a common rail system 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
  • 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 30 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 recip- rocating 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 produc- ing 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.
  • the injection of the liquid fuel and the adjustment of the injection timing and the amount of the injected fuel by a rack 18 and a pinion 19 work in a conventional manner and are therefore not described in more detail here.
  • a small amount of liquid pilot fuel is used for igniting the gaseous fuel.
  • the engine is provided with a common rail system.
  • the fuel injec- tion pumps are therefore not needed when the engine is in the gas mode.
  • 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 second spring 13 keeps the cam follower unit 11 in contact with the cam.
  • the pressure in the hydraulic fluid chamber 6 is maintained until the engine is to be operated on liquid fuel again.
  • hydraulic fluid is released from the hydraulic fluid chamber 6.
  • the piston 4 and the plunger 2 can thus return to their original positions and the mechanical con- nection between the plunger 2 and the cam is re-established.
  • 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 be- tween the hydraulic pump 14 and the hydraulic fluid chamber 6.
  • the hydraulic pump 14 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.

Landscapes

  • 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)

Abstract

The fuel injection pump arrangement for a dual-fuel internal combustion engine 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), a plunger moving mechanism (5, 11) for establishing mechanical connection between the plunger (2) and a rotating cam that drives the fuel injection pump, and means (4, 6, 7) for breaking the mechanical connection between the plunger (2) and the cam when the fuel injection pump is not used for pressurizing fuel. The invention also concerns a method for operating a dual-fuel engine.

Description

FUEL INJECTION PUMP ARRANGEMENT AND METHOD FOR OPERATING AN INTERNAL COMBUSTION
ENGINE
Technical field of the invention
The present invention relates to a fuel injection pump arrangement for a dual-fuel inter- 5 nal 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.
10 Background of the invention
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
15 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
20 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
25 consumption of the engine and also leads in wear of the fuel injection pumps.
Summary of the invention
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 30 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 recip- rocating 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.
Brief description of the drawings
Fig. 1 shows a fuel injection pump arrangement according to an embodiment of the invention.
Detailed description 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 produc- ing 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. In that case, one of the plungers 2 can be used for adjusting the injection timing and the other 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 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. In the embodiment of figure 1, 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. The injection of the liquid fuel and the adjustment of the injection timing and the amount of the injected fuel by a rack 18 and a pinion 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 injec- tion pumps are therefore not needed when the engine is in the gas mode. 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.
In the embodiment of figure 1, 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. Through the fluid supply line 7, 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. 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. When the engine is running in the gas mode, hydraulic fluid is introduced into the hydraulic fluid chamber 6. The piston 4 and the plunger 2 are thus pushed away from the cam. The push rod 5 moves together with the piston 4 and the plunger 2 and is thus separated from the cam follower unit 11. The second spring 13 keeps the cam follower unit 11 in contact with the cam. The pressure in the hydraulic fluid 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 hydraulic fluid chamber 6. The piston 4 and the plunger 2 can thus return to their original positions and the mechanical con- nection between the plunger 2 and the cam is re-established. 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. In the embodiment of figure 1, 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 be- tween 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.
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

Claims
1. 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 means (4, 6, 7) for breaking the mechanical connection between the plunger (2) and the cam when the fuel injection pump is not used for pressurizing fuel.
2. An arrangement according to claim 1, characterized in that the arrangement 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 plunger (2) away from the cam.
3. An arrangement according to claim 2, 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).
4. An arrangement according to claim 3, characterized in that the piston (4) is a sleeve-like part that is arranged around the push rod (5).
5. An arrangement according to any of claims 2-4, characterized in that the hydraulic fluid is lube oil of the engine.
6. An arrangement according to any of claims 2-4, characterized in that the hydraulic fluid is fuel that is used in the engine.
7. An arrangement according to any of the preceding claims, characterized in that the arrangement comprises a hydraulic pump (14) for pressurizing the hydraulic fluid.
8. 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).
9. A method according to claim 8, characterized in that the plunger (2) is moved away from the cam 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).
10. A method according to claim 9, characterized in that the hydraulic fluid is pressurized by a hydraulic pump.
11. A method according to claim 10, 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.
EP12767029.7A 2011-09-30 2012-09-13 Fuel injection pump arrangement and method for operating an internal combustion engine Not-in-force EP2761163B1 (en)

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 of 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
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EP12767029.7A Not-in-force EP2761163B1 (en) 2011-09-30 2012-09-13 Fuel injection pump arrangement and method for operating an internal combustion engine

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EP (1) EP2761163B1 (en)
KR (1) KR101791732B1 (en)
CN (1) CN104755744B (en)
FI (1) FI124006B (en)
WO (1) WO2013045756A1 (en)

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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
CN110691903B (en) * 2017-03-29 2021-04-16 瓦锡兰芬兰有限公司 Fuel pump for supplying fuel to internal combustion piston engine
CN109340001B (en) * 2018-12-13 2021-03-12 单进才 Dual-fuel mixed servo device for engine
US12247564B2 (en) 2020-06-03 2025-03-11 Hyundai Heavy Industries Co., Ltd. Gas supply pump for ship dual fuel 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
KR20240130893A (en) 2023-02-22 2024-08-30 이상선 Switchgear preventive maintenance system using artificial intelligence
KR102616805B1 (en) 2023-05-08 2023-12-21 주식회사 이케이전력 IoT-based corrosion pre-detection switchgear preventive maintenance system
KR102769359B1 (en) 2024-04-17 2025-02-19 주식회사 이케이전력 IoT-based corrosion-resistant switchgear system

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KR101791732B1 (en) 2017-10-30
CN104755744A (en) 2015-07-01
EP2761163B1 (en) 2015-07-29
CN104755744B (en) 2017-03-29
WO2013045756A1 (en) 2013-04-04
FI124006B (en) 2014-01-31
FI20115954L (en) 2013-03-31
KR20140069080A (en) 2014-06-09
FI20115954A0 (en) 2011-09-30

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