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
  • F02M63/0012—Valves
  • F02M63/0014—Valves characterised by the valve actuating means
  • F02M63/0015—Valves characterised by the valve actuating means electrical, e.g. using solenoid
  • F02M63/0017—Valves characterised by the valve actuating means electrical, e.g. using solenoid using electromagnetic operating means
• • 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
  • F02M53/00—Fuel-injection apparatus characterised by having heating, cooling or thermally-insulating means
• • 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
  • F02M59/20—Varying fuel delivery in quantity or timing
  • F02M59/34—Varying fuel delivery in quantity or timing by throttling of passages to pumping elements or of overflow passages, e.g. throttling by means of a pressure-controlled sliding valve having liquid stop or abutment
• • 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
  • F02M63/0001—Fuel-injection apparatus with specially arranged lubricating system, e.g. by fuel oil
• • 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
  • F02M63/0012—Valves
  • F02M63/0031—Valves characterized by the type of valves, e.g. special valve member details, valve seat details, valve housing details
  • F02M63/004—Sliding valves, e.g. spool valves, i.e. whereby the closing member has a sliding movement along a seat for opening and closing
• • 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
  • F02M63/02—Fuel-injection apparatus having several injectors fed by a common pumping element, or having several pumping elements feeding a common injector; Fuel-injection apparatus having provisions for cutting-out pumps, pumping elements, or injectors; Fuel-injection apparatus having provisions for variably interconnecting pumping elements and injectors alternatively
  • F02M63/0225—Fuel-injection apparatus having a common rail feeding several injectors ; Means for varying pressure in common rails; Pumps feeding common rails
• • 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
  • F02M69/00—Low-pressure fuel-injection apparatus ; Apparatus with both continuous and intermittent injection; Apparatus injecting different types of fuel
  • F02M69/46—Details, component parts or accessories not provided for in, or of interest apart from, the apparatus covered by groups F02M69/02 - F02M69/44
  • F02M69/52—Arrangement of fuel metering devices
• • 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
  • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
  • F02M2200/60—Fuel-injection apparatus having means for facilitating the starting of engines, e.g. with valves or fuel passages for keeping residual pressure in common rails

Definitions

• the invention relates to a fuel injection device for an internal combustion engine according to the preamble of claim 1.
• Such a fuel injection device is known from DE 198 53 103 A1.
• This fuel injection device has a delivery pump, through which fuel is delivered to a high-pressure pump, the high-pressure pump delivering fuel under high pressure to a storage device.
• a fuel metering device is provided, which is arranged between the feed pump and the high-pressure pump.
• the fuel metering device is used to control the amount of fuel delivered to the store by the high-pressure pump depending on the operating parameters of the internal combustion engine.
• the fuel metering device comprises an actuator in the form of an electromagnet and a control valve actuated by it, which has a slide-shaped valve member which is guided in a cylinder bore of a valve housing and which can be moved by an armature of the electromagnet against a return spring.
• the valve member In cooperation with an outlet opening of the valve housing, the valve member controls a flow cross-section from the feed pump to the high-pressure pump via its outer jacket depending on the stroke. In a closed position of the valve member, this is with its outer jacket in Cover with the drain opening so that the flow cross section is completely closed.
• the valve member since the valve member must be displaceable in the cylinder bore of the valve housing, there is a small gap between the outer casing and the cylinder bore through which a leakage amount of fuel can pass and reach the high-pressure pump via the drain opening, even if due to the operating parameters of the internal combustion engine, for example in the Thrust operation, no fuel needs to be pumped by the high pressure pump. Measures are therefore necessary in order to discharge this amount of fuel leakage so that it cannot reach the high-pressure pump. This makes the construction and manufacture of the fuel injection device complex.
• the fuel injection device according to the invention with the features of claim 1 has the advantage that the high pressure pump can be completely separated from the feed pump by the valve member by means of the sealing surface in cooperation with the valve seat, so that no further measures are required for this and the structure and manufacture the fuel injection device are simplified accordingly.
• FIG. 1 shows a fuel injection device for an internal combustion engine in a schematic illustration
• FIG. 2 shows an enlarged illustration of a fuel metering device of the fuel injection device according to a first exemplary embodiment in a first position
• FIG. 3 shows the fuel metering device in a second position
• FIG. 4 shows the fuel metering device in a view in the direction of arrow IV in Figure 2 and Figure 5, the fuel metering device according to a second embodiment.
• FIG. 1 shows a fuel injection device for an internal combustion engine, for example of a motor vehicle.
• the internal combustion engine is preferably a self-igniting internal combustion engine and has one or more cylinders.
• the motor vehicle has a fuel reservoir 10 in which fuel is stored for the operation of the internal combustion engine.
• the fuel injection device has a feed pump 12, through which fuel is delivered from the fuel reservoir 10 to a high-pressure pump 14.
• the high-pressure pump 14 pumps fuel into a reservoir 16, which can be tubular, for example, or in any other form. Lines 18 lead from memory 16 to arranged on the cylinders of the internal combustion engine Injectors 20 from.
• An electrical control valve 22 is arranged on each of the injectors 20, through which an opening of the injectors is controlled, in order to thus effect fuel injection by the respective injector 20 or to prevent fuel injection.
• the control valves 22 are controlled by an electronic control device 23, which determines the point in time and the duration of the fuel injection by the injectors 20 as a function of operating parameters of the internal combustion engine, such as, for example, speed, load, temperature and others.
• a return for unused fuel leads back from the injectors 20, at least indirectly, for example via a line 24 common to all injectors, into the fuel reservoir 10.
• a line 26 can also return from the reservoir 16 to the fuel tank 10, in which a pressure relief valve 28 is arranged, in order to prevent an impermissibly high pressure from building up in the reservoir 16.
• the high pressure pump 14 is mechanically driven by the internal combustion engine and thus proportional to the speed of the internal combustion engine.
• the feed pump 12 can also be driven mechanically by the internal combustion engine, and a common drive shaft can be provided for the high pressure pump 14 and the feed pump 12.
• the feed pump 12 may alternatively also have an electric motor drive, for example.
• the high-pressure pump 14 can be designed as a radial piston pump and has a plurality of, for example three, pump elements 30 arranged at a uniform angular distance from one another, each of which has a pump piston 34 driven in one stroke by a polygon 32 in connection with an eccentric shaft, each of which delimits a pump working space 36.
• a check valve 38 opening towards the accumulator 16, through which the separation between the pump work spaces 36 and the accumulator 16 takes place during the suction stroke of the pump pistons 34.
• a check valve 39 which opens towards the pump work rooms 36 and through which the pump work rooms 36 and the feed pump 12 are separated during the delivery stroke of the pump pistons 34.
• the pump work spaces 36 are connected to the outlet of the feed pump 12 when the check valves 39 are open and are filled with fuel, the pump work spaces 36 being separated from the accumulator 16 by the closed check valves 38 are.
• the pump working spaces 36 are connected to the accumulator 16 when the check valves 38 are open and are separated from the outlet of the delivery pump 12 by the closed check valves 39.
• One or more filters are preferably arranged between the feed pump 12 and the fuel reservoir 10.
• a coarse filter 40 can be provided first, followed by a fine filter 42, whereby the fine filter 42 can additionally have a water separator.
• a fuel metering device 44 is arranged between the feed pump 12 and the high pressure pump 14.
• the fuel metering device 44 has a control valve 46 actuated by an electrical actuator 45, for example an electromagnet or a piezo actuator that the flow from the feed pump 12 to the high pressure pump 14 is continuously adjustable.
• the fuel metering device 44 is also controlled by the control device 23, in such a way that a fuel quantity is supplied to the high-pressure pump 14 by the feed pump 12, which in turn is then pumped under high pressure into the memory 16 by the high-pressure pump 14 in order to have a predetermined value in the memory 16 to maintain pressure dependent on operating parameters of the internal combustion engine.
• the fuel metering device 44 is shown enlarged according to a first embodiment.
• the fuel metering device 44 has a valve housing 50, in which a slide-shaped valve member 54 is displaceably guided in a cylinder bore 52.
• the valve member 54 has at least one recess 56 in its outer jacket, which extends in the direction of the longitudinal axis 55 of the valve member 54 over part of the longitudinal extent and also over part of the circumference of the valve member 54.
• the recess 56 is explained in more detail below.
• an outlet opening 58 opening into the cylinder bore 52 is formed, with which the recess 56 of the valve member 54 cooperates to control the size of a flow cross section.
• the drain opening 58 is connected to the suction side of the high pressure pump 14.
• the recess 56 extends in the longitudinal direction on the valve member 54 up to an end face of the valve member 54.
• the valve member 54 has a sealing surface 60 which, for example, as shown in FIG. 2, can be at least approximately tapered in the shape of a truncated cone.
• the valve member 54 tapers in the shape of a truncated cone towards its end.
• the sealing surface 60 can alternatively, for example, at least approximately spherical segment-shaped.
• an inlet opening 62 opens, which is connected to the outlet of the feed pump 12.
• a valve seat 64 is formed in the valve housing 50, with which the valve member 54 cooperates with its sealing surface 60 to close the inlet opening 62.
• the valve seat 64 can also be at least approximately frustoconical, the cone angles of the sealing surface 60 and the valve seat 64 being the same or different.
• the valve seat 64 widens towards the valve member 54.
• the cone angle of the valve seat 64 is preferably greater than the cone angle of the sealing surface 60, so that the valve member 54 only comes into contact with the valve seat 64 with the edge of its sealing surface 60 at the end of the valve member 54.
• An armature 66 of the electromagnet 45 engages on the valve member 54 on the side facing away from the valve seat 64, by means of which the valve member 54 can be displaced toward the valve seat 64 when the electromagnet 45 is energized.
• a return spring 68 acts on the valve member 54.
• the function of the fuel metering device 44 is explained below. If no fuel is to be conveyed into the accumulator 16 by the high-pressure pump 14, the electromagnet 45 is energized by the control device 23 with a high current, so that the valve member 54 against the force of the return spring 68 with its sealing surface 60 in contact with the valve seat 64 is brought as shown in Figure 2.
• the inlet opening 62 is completely closed by the valve member 54, even if pressure is generated by the feed pump 12.
• the recess 56 of the The valve member 54 is not in overlap with the drain opening 58, but the valve member 54 with its full cylindrical cross section is in overlap with the drain opening 58.
• the end of the recess 56 is also in the direction of the longitudinal axis 55 of the valve member 54 at a distance h from the edge of the drain opening 58 arranged.
• the electromagnet 45 is energized by the control device 23 with a lower current intensity, so that the valve member 54 is caused by the return spring 68 to move in the opening direction 70 and with its sealing surface 60 lifts off the valve seat 64 and releases the inlet opening 62.
• the recess 56 is not yet in register with the drain opening 58, so that no flow cross-section is released, but only a small amount of fuel leakage between the outer jacket of the valve member 54 and the cylinder bore 52 can pass through and reach the high pressure pump 14.
• valve member 54 When the valve member 54 is lifted with its sealing surface 60 from the valve seat 64, the space delimited between the valve member 54 and the end wall 53 in the cylinder bore 52 is filled with fuel under the pressure generated by the feed pump 12. Only when the idle stroke h of the valve member 54 has been passed through does its recess 56 overlap with the drain opening 58 and releases a flow cross-section, as shown in FIG. 3. With this configuration, a separation between the function of completely closing the inlet opening 62 by the valve member 54 when no fuel is to be conveyed by the high-pressure pump 14 and the function of controlling the flow cross section by the valve member 54 is achieved.
• the recess 56 on the valve member 54 widens in such a way that an increasingly larger flow cross-section is released from the cylinder bore 52 into the outlet opening 58 when the valve member 54 moves in its opening direction 70.
• the region 57 of the recess 56 which interacts with the drain opening 58 can, for example, be trapezoidal, as shown in FIG. 4, the region 57 widening toward the end of the valve member 54 which has the sealing surface 60.
• the region 57, up to the end of the valve member 54 has a recess which is narrower than the region 57 and runs approximately parallel to the longitudinal axis 55 of the valve member 54.
• Activation of the electromagnet 45 by the control device 23 with different current strengths can be achieved, for example, by actuating the electromagnet 45 in a pulse-width-modulated manner, the current strength and thus the size of the released flow cross-section being dependent on the pulse width.
• the metering device 144 is shown according to a second embodiment.
• the metering device 144 has the valve housing 150 with the cylinder bore 152, in which the valve member 154 is displaceably guided.
• the valve member 154 is pot-shaped and has a closed end toward the armature 66 of the electromagnet 45 with a base 172 against which the armature 66 abuts.
• the valve member 154 has at least one, preferably a plurality of openings 156 distributed over its circumference.
• the at least one drain opening 158 is formed in the valve housing 150, with a plurality of openings 158 distributed over the circumference of the valve housing 150 being provided, with which the openings 156 of the valve member 154 cooperate to control the size of the flow cross section.
• a component 174 is sealingly inserted into the cylinder bore 152 from the side facing away from the electromagnet 45 and has a connection piece 176 projecting into the valve member 154 from its open end.
• a channel 177 runs as a connection to the outlet of the feed pump 12 and the channel 177 opens into one Inlet opening 162 at the end of the nozzle 176 in the valve member 154.
• the inlet opening 162 is surrounded by a valve seat 164 at the front end of the nozzle 176.
• a separate sealing element 178 which has a sealing surface and which is designed, for example, as a ball.
• the ball 178 can be held in a carrier 180 which is inserted into the cylinder bore 152, in particular pressed into it.
• the ball 178 protrudes with a part of its circumference from the carrier 180 to the nozzle 176.
• this rests with the ball 178 on the valve seat 164 at the front end of the connector 176 and closes the inlet opening 162.
• the openings 156 of the valve member 154 only overlap after an empty stroke h has been passed, as in the first exemplary embodiment with the drain openings 158 of the valve housing 150 and then control the size of the flow area.

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• Engineering & Computer Science (AREA)
• Chemical & Material Sciences (AREA)
• Combustion & Propulsion (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Physics & Mathematics (AREA)
• Electromagnetism (AREA)
• Fuel-Injection Apparatus (AREA)

Applications Claiming Priority (2)

Publications (2)

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ID=7709799

Family Applications (1)

Country Status (6)

Cited By (3)

Families Citing this family (9)

Citations (1)

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• 2002
  • 2002-11-08 EP EP02024857A patent/EP1321663A3/fr not_active Withdrawn
  • 2002-12-16 US US10/319,584 patent/US20030136384A1/en not_active Abandoned
  • 2002-12-17 JP JP2002365264A patent/JP2003222059A/ja active Pending
  • 2002-12-19 DE DE10261780A patent/DE10261780A1/de not_active Withdrawn
  • 2002-12-19 WO PCT/DE2002/004757 patent/WO2003052262A1/fr not_active Application Discontinuation
  • 2002-12-19 AU AU2002363846A patent/AU2002363846A1/en not_active Abandoned
  • 2002-12-19 DE DE10295868T patent/DE10295868D2/de not_active Expired - Fee Related

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