EP1896713A1 - Fuel injection system for an internal combustion engine - Google Patents
Fuel injection system for an internal combustion engineInfo
- Publication number
- EP1896713A1 EP1896713A1 EP06763095A EP06763095A EP1896713A1 EP 1896713 A1 EP1896713 A1 EP 1896713A1 EP 06763095 A EP06763095 A EP 06763095A EP 06763095 A EP06763095 A EP 06763095A EP 1896713 A1 EP1896713 A1 EP 1896713A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- fuel
- pump
- bearing
- pressure
- flow
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 239000000446 fuel Substances 0.000 title claims abstract description 204
- 238000002347 injection Methods 0.000 title claims description 19
- 239000007924 injection Substances 0.000 title claims description 19
- 238000002485 combustion reaction Methods 0.000 title claims description 12
- 230000001105 regulatory effect Effects 0.000 claims description 10
- 238000004891 communication Methods 0.000 claims description 4
- 230000001276 controlling effect Effects 0.000 claims description 4
- 230000008901 benefit Effects 0.000 description 10
- 238000001816 cooling Methods 0.000 description 10
- 238000005461 lubrication Methods 0.000 description 9
- 238000013016 damping Methods 0.000 description 7
- 230000001050 lubricating effect Effects 0.000 description 7
- 238000004519 manufacturing process Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 3
- 239000000314 lubricant Substances 0.000 description 3
- 238000011144 upstream manufacturing Methods 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 239000006185 dispersion Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000002706 hydrostatic effect Effects 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 230000033228 biological regulation Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
- 230000037452 priming Effects 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 230000008646 thermal stress Effects 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/30—Controlling fuel injection
- F02D41/38—Controlling fuel injection of the high pressure type
-
- 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
-
- 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
- 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
- F02M59/36—Varying fuel delivery in quantity or timing by variably-timed valves controlling fuel passages to pumping elements or overflow passages
-
- 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
- F02M59/36—Varying fuel delivery in quantity or timing by variably-timed valves controlling fuel passages to pumping elements or overflow passages
- F02M59/366—Valves being actuated electrically
-
- 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
- F02M63/02—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
-
- 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
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
- F04B53/18—Lubricating
-
- 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
- F02M2200/04—Fuel-injection apparatus having means for avoiding effect of cavitation, e.g. erosion
Definitions
- the invention is based on a high-pressure fuel pump for a fuel injection system of an internal combustion engine, with a pump housing in which a drive shaft is supported by a first bearing and a second bearing, with at least one with respect to the drive shaft radially arranged pump element, with a fuel inlet, wherein a prefeed pump fuel in the
- Fuel feed promotes, with a fuel return, with a metering unit for controlling the flow rate of the pump or elements and with a pressure control valve.
- the pressure control valve is used to regulate the pressure in the low-pressure circuit of the high-pressure fuel pump.
- the delivery rate of the prefeed pump is usually divided into three partial streams.
- a first partial flow flows through the metering unit to the suction side of the pump element (s).
- the second partial flow usually flows through a lubricant throttle through the pump housing and serves there for cooling and lubrication of the pump. From the pump housing this second partial flow enters the fuel return of the fuel injection system.
- a third partial flow flows through the pressure control valve, which may also be designed as a relief valve and also passes into the fuel return.
- the invention has for its object to provide a high-pressure fuel pump for a fuel injection system, which manages with the same space as conventional high-pressure fuel pumps and yet with respect to thermal and mechanical load capacity known from the prior art
- High-pressure fuel pumps is superior.
- the high-pressure fuel pump according to the invention should be simple in construction and inexpensive to produce.
- a high-pressure fuel pump for a fuel injection system of an internal combustion engine with a pump housing, with a drive shaft, wherein the drive shaft is mounted in the pump housing by a first bearing and a second bearing, with at least one with respect to the drive shaft radially arranged pump element, with a fuel inlet , wherein a prefeed pump promotes fuel in fuel supply, with a fuel return, with a metering unit for
- the inventive arrangement of the pressure control valve in the fuel return is achieved, inter alia, that the majority of funded by the feed pump fuel flows through the pump housing, thereby contributing to improved cooling of the pump housing and the drive shaft.
- the pressure in the pump housing is raised compared to conventional constructions, which reduces the Kavitationsneist inside the pump housing.
- the formation of vapor bubbles and local overheating is effectively prevented.
- the high-pressure fuel pump according to the invention can be dispensed with a lubricating throttle between the prefeed pump and the pump housing, so that the high-pressure fuel pump according to the invention is constructed even easier than conventional high-pressure fuel pumps despite the advantages mentioned.
- the first bearing is lubricated by pressurized fuel, and that the first bearing is hydraulically in communication both with the fuel inlet, and with the fuel return. This means that on one side of the first bearing about the same pressure prevails as on the pressure side of the prefeed pump, while the other side of the first bearing is in pressure equilibrium with the almost non-pressurized fuel return. As a result, the first bearing is forcibly traversed by fuel and thus ensures adequate lubrication and cooling of the first bearing in all operating points.
- a first flow limiting device is provided, which is connected in series with the first bearing.
- the first flow restrictor serves to keep the fuel flow flowing through the first bearing within predetermined limits.
- the first flow restricting device according to the invention is connected in series with the first bearing, because of the very small manufacturing tolerance with which the first flow restricting device can be produced, the Kraftstoffström can be adjusted by the first bearing.
- the abovementioned manufacturing tolerances have only a slight effect on the carrying capacity, so that the load capacity of the first bearing is ensured even in the case of an unfavorable tolerance position in all operating points of the high-pressure fuel pump.
- the flow restrictor limits the fuel flow passing through the bearing. As a result, the requirements for the prefeed pump are reduced in unfavorable tolerance positions of the bearing.
- a high-pressure fuel pump for a fuel injection system of an internal combustion engine with a pump housing, with a drive shaft, wherein the drive shaft is supported in the pump housing by a first bearing and a second bearing, with at least one with respect to the drive shaft radially arranged pump element, with a fuel inlet, wherein a priming pump promotes fuel into the fuel inlet, with a fuel return, with a metering unit for controlling the delivery rate of the one or more pump elements, and having a pressure regulating valve arranged in the inlet, in that the first bearing is lubricated by pressurized fuel, that the first bearing is hydraulically in communication with both the fuel inlet and the fuel return a first flow limiting device is provided, that the first flow restriction is connected in series with the first bearing, and that between the pump housing and the fuel return, a bypass throttle is provided.
- Tuning the first flow restrictor and the bypass throttle are ensured in a simple and effective manner that a sufficient amount of fuel flows through the first bearing and thus its cooling and lubrication is ensured at all operating points.
- the metering unit can alternatively be arranged between the prefeed pump and the high-pressure fuel pump in the fuel inlet, or be arranged between the pressure regulating valve and the high-pressure fuel pump in the fuel return. Both arrangements have specific advantages that are to be weighed against each other in each individual case.
- KraftstoffZulauf speaks that in this arrangement the fuel flowing into the high pressure region of the high-pressure fuel pump has not previously flowed through the pump housing, so that there any existing chips or other particles can not get into the high-pressure fuel area ,
- An advantage of the arrangement of the metering unit in the fuel return is that the entire amount of fuel delivered by the prefeed pump is available at any operating point for cooling and lubrication of the pump housing or the drive shaft of the high-pressure fuel pump and the associated bearings. As a result, the load capacity of the low-pressure region of the high-pressure fuel pump according to the invention is further increased.
- first flow-limiting device in the flow direction before or after the first bearing. Which arrangement is preferred in an individual case depends on the circumstances and boundary conditions of the individual case.
- High-pressure fuel pumping may be further provided that the second bearing is lubricated by pressurized fuel and that the second bearing is hydraulically in communication with both the fuel inlet and the fuel return.
- Flow limiting device may be provided, which is arranged in the flow direction before or after the second bearing.
- the benefits of forced lubrication of the second bearing and the second flow restricting device essentially correspond to the aforementioned advantages which would be mentioned in connection with the first bearing and the first flow-limiting device.
- the first flow-limiting device and / or the second flow-limiting device can be designed as a throttle, diaphragm or as a flow control valve. Which of these alternatives is preferred in each individual case depends on the tolerance fields of the various components, the loads and of course economic reasons and must be decided on a case-by-case basis.
- a particularly advantageous embodiment of the invention provides that the second bearing is supplied by a leakage line of the prefeed pump with pressurized fuel. This is particularly advantageous if the prefeed pump z.
- the prefeed pump z As a vane pump,
- External gear pump or internal gear pump is formed.
- leakage occurs at the interface with the drive shaft in the gap between the impeller or toothed wheel and the housing, which leakage must be dissipated through a leakage line.
- this leakage line is used in the lubrication and cooling of the second bearing, first, the lubrication and cooling of the second bearing can be ensured under all operating conditions and, secondly, the leakage quantity of the prefeed pump is reduced because of the back pressure. This leads to an improved hydraulic efficiency of the prefeed pump.
- first bearing and / or the second bearing are designed as plain bearings. Then can formed by the inventive supply of the bearing with pressurized fuel, a stable hydrostatic lubricating film, which ensures a very high load capacity of the bearing in different speed ranges.
- the fuel connection opens into an interior of the pump housing, wherein the drive shaft is arranged in the interior of the pump housing.
- a fuel injection system for an internal combustion engine with a prefeed pump, with a tank, with a high-pressure fuel pump, with a common rail and with at least one injector when the
- High-pressure fuel pump is a high-pressure fuel pump according to one of the preceding claims.
- the prefeed pump can be driven by the internal combustion engine or by an electric motor.
- FIG. 1 shows a first exemplary embodiment of a high-pressure fuel pump 1 according to the invention in a block diagram representation.
- the high-pressure fuel pump 1 is part of a
- Fuel injection system consisting essentially of a tank 3, a prefeed pump 5, a filter 7, a rail 9 and a pressure relief valve 11.
- the injectors, which are connected to the rail 9, are not shown in FIG.
- the pressure limiting valve 11 opens into a return line 13, in which the leakage quantities of the injectors, not shown, are discharged.
- the return line 13 opens in this first embodiment in the tank 3 and drives there a jet pump (without reference numerals).
- the high-pressure fuel pump 1 is hydraulically connected to the tank 3 via a fuel inlet 15, the filter 7 and the prefeed pump 5.
- the metering unit 19 serves to control the amount of fuel sucked by pump elements 21 of the high-pressure fuel pump and thus also the delivery rate thereof. These are the Suction sides of the pump elements 21 via a distribution line 23 to the output of the metering unit 19 hydraulically connected.
- the pump elements 21 consist essentially of
- the pistons 29 of the pump elements 21 are driven by roller tappets 31 of cams 33 of a drive shaft 35.
- the pump elements 21 convey fuel under high pressure via a high-pressure line 27 into the rail 9.
- the cams 33 are part of a drive shaft 35, which is rotatably mounted on both sides of the cam 33 in a first bearing and in a second bearing in a pump housing (not shown).
- the drive shaft 35 is arranged in an inner space 39 of the pump housing.
- the bearings of the drive shaft 35 are shown in the block diagram of Figure 1 as a throttle point.
- the first bearing has the reference numeral 39 in FIG. 1, while the second bearing has been designated by the reference numeral 41.
- a fuel return 43 establishes a hydraulic connection between the interior 38 of the pump housing and the return line 13.
- a pressure regulating valve 45 is arranged in the fuel return 43.
- different throttles may be integrated in the pressure control valve 45.
- the pressure regulating valve 45 is arranged downstream of the interior 38 of the high-pressure fuel pump 1. This means that in the interior 38 almost the same pressure as on the Pressure side of the feed pump 5 prevails. In general, the pressure on the pressure side of the prefeed pump 5 and thus of the inner space 38 is about 3 bar to about 6 bar.
- first bearing 39 and the second bearing 41 are usually formed as a sliding bearing, formed by the forced flow through the bearings 39 and 41 in the bearings 39 and / or 41, a hydrostatic lubricating wedge. As a result, the load capacity of the first bearing 39 and the second bearing 41 increases considerably and at the same time the heat dissipation from the first bearing 39 and the second bearing 42 is improved.
- a first optional one is in series with the first bearing 39
- Flow limiting device 47 is arranged. As indicated in FIG. 1, this first flow-limiting device can be designed as a throttle. Alternatively, you can they also be designed as a diaphragm, or as a flow control valve.
- the amount of fuel flowing through the first bearing 39, within a series of high-pressure fuel pump 1 can significantly scatter. This undesirable effect, if necessary, is reduced to an uncritical level by the first flow restricting device 47 according to the invention.
- the fuel quantity flowing through the first bearing 39 can be kept within a predetermined range for all tolerance positions which occur during series production.
- a suitable second flow-limiting device (not shown) can also be provided for the second bearing 41.
- a filter is provided in the fuel inlet 15, which also has the function of
- Damping device 49 takes over. This can dampen any pressure fluctuations occurring in the low pressure range.
- the damping device 49 may be formed as a damper with a gas cushion or omitted.
- the high-pressure fuel pump 1 has, inter alia, the following advantages:
- both the first bearing 39 and the second bearing 41 are forcibly traversed by fuel, which significantly increases their capacity, both with respect to mechanical and thermal stresses.
- Flow limiting device can be reduced.
- the amount of fuel flowing through the pump housing and bearings 39 and 41 for lubrication and cooling purposes is greatly increased.
- a lubricating throttle for setting a defined amount of lubricant can be omitted. Due to the large quantities of lubricants, any particles that may be present are quickly washed out of the interior.
- the delivery of the feed pump can often be reduced, which improves the efficiency of the injection system.
- inventive high-pressure fuel pumps and inventive fuel injection systems are also shown as a block diagram. Only the essential differences are explained. Same components are the same
- Embodiment according to Figure 2 is that the first branch line 17 branches off in the second embodiment of the fuel return 43. This means that the entire funded by the feed pump 5 fuel passes through the fuel inlet 15 first into the interior 38 of the high-pressure fuel pump and branches only there. As a result, an even better flow and cooling of the high-pressure fuel pump 1 is achieved.
- a damping device 49 is provided in the fuel return 43.
- the damping device 49 is arranged upstream of the pressure regulating valve 45 and the metering unit 19 as seen in the flow direction.
- the damping device 49 is formed in FIG. 2 as a filter with, if necessary, an increased flow resistance (not shown).
- the damper 49 may be formed as a damper with a gas cushion is arranged.
- a suction throttle 51 is provided, which limits the flow rate of the prefeed pump 5, especially at high speeds.
- the prefeed pump 5 can be designed as a vane cell pump, as an external gear pump or as an internal gear pump, in particular as a gerotor pump. These pumps have a gap between the rotating components and the pump housing that causes leakage losses. This gap is shown in Figure 3 by the symbol of a throttle (see reference numeral 53). The leakage amount flowing through the gap is passed through a leakage line 55 dissipated. The leakage line 55 supplies in this embodiment, the first bearing 39 with fuel.
- a Abgrestechnisch 56 is provided which goes off from the pressure control valve 45 and upstream of the suction throttle 51 opens into the fuel inlet 15. About the diversion line 56, the excess amount of fuel from the pressure control is discharged into the inlet 15.
- the first bearing 39 is supplied from the interior 38 with fuel. From the leakage line 55 goes from a second branch line 57, which opens into the fuel return 43. By the second branch line 57 and the lubricating amount of the first bearing 39 is discharged. In the second branch line 57, a bypass throttle 59 may be provided.
- FIG. 4 shows a further exemplary embodiment of a high-pressure fuel pump 1 according to the invention, which has many parallels to the third exemplary embodiment according to FIG. Also in this embodiment, a leakage line 55 is arranged on the prefeed pump 5.
- the first bearing 39 is also supplied in this embodiment, from the interior 38 with fuel. From the leakage line 55 goes from a second branch line 57, which opens into the fuel return 43. By the second branch line 57 and the lubricating amount of the first bearing 39 is discharged. In the second branch line 57, a bypass throttle 59 may be provided.
- the metering unit 19 is arranged in the fuel inlet 15, as is also the case in the first embodiment according to FIG. In the embodiment of Figure 4, the fuel return 43 is not returned to the tank 3, as in the embodiments 1 and 2, but as in the third embodiment in the fuel return 15 and that upstream of the suction throttle 51.
- the essential difference of the fifth exemplary embodiment according to FIG. 5 to the fourth exemplary embodiment according to FIG. 4 is that in the fifth exemplary embodiment the metering unit 19 and the optional damping device 49 are arranged in the fuel return 43.
- the pressure relief for the movement of the piston of the pressure regulating valve 45 can be selectively connected to the fuel inlet 15 or the fuel return 43.
- the pressure regulating valve 45 has a separate diversion line 56, which, similar to the third embodiment, opens in front of the suction throttle 51 in the fuel inlet 15.
- the fuel return 43 is returned via the return line 13 into the tank 3.
- a third branch line 63 which connects the interior 38 of the high-pressure fuel pump 1 with the fuel return 43.
- a second bypass throttle 61 is arranged in series with the second bypass throttle 61.
- a pressure limiting valve 65 is provided in the third branch line 63. The pressure relief valve 65 ensures that when exceeding a predetermined pressure difference between the pressure in the interior 38 of the
- the third branch line 63 is opened and thus the Excess fuel from the interior 38 can flow.
- the leakage line 55 opens into the interior 38 of the
- the first bearing 39 is supplied with pressurized fuel from the interior 38 of the pump housing, which then flows through the first flow restrictor 47 and then enters the fuel return 63. Also with this
- the fuel metering unit 19 is arranged on the side of the fuel return 43 with the advantages already mentioned several times; However, it may also be arranged on the side of the fuel inlet 15.
- the prefeed pump 5 is designed as an electromotive driven fuel pump, which is arranged in the vicinity of the tank 3.
- the metering unit 19 is arranged on the fuel inlet side 15 of the high-pressure fuel pump 1.
- the pressure control valve 45 is connected on the input side to the fuel inlet 15.
- the output side of the pressure control valve 45 opens into the fuel return 43.
- In the fuel return 43 also opens the third branch line 63 in which not only a second bypass line
- Throttle but also a damping device 49, such as a filter is arranged.
- the fuel flowing through the first bearing 39 and the first flow restricting device 47 is also discharged into the fuel return 43.
- the second bearing 41 which in the exemplary embodiment according to FIG. 7 is provided with a second flow-limiting device 67 whose mode of operation corresponds to the first flow-limiting device 47.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Fuel-Injection Apparatus (AREA)
- Details And Applications Of Rotary Liquid Pumps (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102005027851A DE102005027851A1 (en) | 2005-06-16 | 2005-06-16 | Fuel injection system for an internal combustion engine |
PCT/EP2006/062119 WO2006134002A1 (en) | 2005-06-16 | 2006-05-08 | Fuel injection system for an internal combustion engine |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1896713A1 true EP1896713A1 (en) | 2008-03-12 |
EP1896713B1 EP1896713B1 (en) | 2010-10-27 |
Family
ID=36754817
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP06763095A Active EP1896713B1 (en) | 2005-06-16 | 2006-05-08 | Fuel injection system for an internal combustion engine |
Country Status (8)
Country | Link |
---|---|
US (1) | US8371267B2 (en) |
EP (1) | EP1896713B1 (en) |
JP (1) | JP4567787B2 (en) |
KR (1) | KR101046851B1 (en) |
CN (1) | CN101198784B (en) |
AT (1) | ATE486206T1 (en) |
DE (2) | DE102005027851A1 (en) |
WO (1) | WO2006134002A1 (en) |
Families Citing this family (37)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102006013165A1 (en) * | 2006-03-22 | 2007-09-27 | Robert Bosch Gmbh | High-pressure fuel pump and fuel injection system for an internal combustion engine |
DE102006048356A1 (en) * | 2006-10-12 | 2008-04-17 | Robert Bosch Gmbh | High-pressure fuel pump and fuel injection system for an internal combustion engine |
DE102007037084A1 (en) | 2007-08-06 | 2009-02-12 | Robert Bosch Gmbh | Fuel high pressure pump for fuel injection system of internal combustion engine, has pumping element with element space that is connected with low pressure, where quantity or pressure compensating device is attached to suction valve |
DE102007038426A1 (en) | 2007-08-14 | 2009-02-19 | Robert Bosch Gmbh | Fuel injection system |
ITMI20072066A1 (en) * | 2007-10-26 | 2009-04-27 | Bosch Gmbh Robert | FUEL INJECTION SYSTEM WITH A LUBRICATED HIGH PRESSURE PUMP WITH FUEL, AND ITS RELATED PUMP GROUP |
DE102008043643A1 (en) * | 2007-11-29 | 2009-06-04 | Robert Bosch Gmbh | Fuel injection system for an internal combustion engine with HC injector |
IT1391090B1 (en) * | 2008-07-14 | 2011-11-18 | Bosch Gmbh Robert | METHOD AND LUBRICATION CIRCUIT FOR A HIGH PRESSURE PUMP FOR FUEL SUPPLY TO AN INTERNAL COMBUSTION ENGINE AND FUEL SUPPLY SYSTEM INCLUDING SUCH CIRCUIT |
DE102008055935A1 (en) * | 2008-11-05 | 2010-05-12 | Continental Automotive Gmbh | Injection system for an internal combustion engine |
DE102009001563A1 (en) * | 2009-03-16 | 2010-09-23 | Robert Bosch Gmbh | high pressure pump |
ITMI20090815A1 (en) * | 2009-05-12 | 2010-11-13 | Bosch Gmbh Robert | SYSTEM FOR FUEL SUPPLY FROM A TANK TO AN INTERNAL COMBUSTION ENGINE |
DE102009026715A1 (en) | 2009-06-04 | 2010-12-09 | Robert Bosch Gmbh | High-pressure fuel pump for fuel injection system of internal combustion engine, has fuel inlet for supplying fuel to pump, and high pressure chamber with leakage point staying in connection with fuel inlet by high pressure leakage lines |
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2005
- 2005-06-16 DE DE102005027851A patent/DE102005027851A1/en not_active Withdrawn
-
2006
- 2006-05-08 WO PCT/EP2006/062119 patent/WO2006134002A1/en active Application Filing
- 2006-05-08 JP JP2008516262A patent/JP4567787B2/en active Active
- 2006-05-08 AT AT06763095T patent/ATE486206T1/en active
- 2006-05-08 KR KR1020077029235A patent/KR101046851B1/en active IP Right Grant
- 2006-05-08 US US11/912,226 patent/US8371267B2/en active Active
- 2006-05-08 EP EP06763095A patent/EP1896713B1/en active Active
- 2006-05-08 CN CN2006800213209A patent/CN101198784B/en active Active
- 2006-05-08 DE DE502006008185T patent/DE502006008185D1/en active Active
Non-Patent Citations (1)
Title |
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See references of WO2006134002A1 * |
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DE102005027851A1 (en) | 2006-12-21 |
US8371267B2 (en) | 2013-02-12 |
US20120132177A1 (en) | 2012-05-31 |
DE502006008185D1 (en) | 2010-12-09 |
KR20080016638A (en) | 2008-02-21 |
CN101198784A (en) | 2008-06-11 |
CN101198784B (en) | 2010-05-19 |
JP2008544139A (en) | 2008-12-04 |
ATE486206T1 (en) | 2010-11-15 |
KR101046851B1 (en) | 2011-07-06 |
JP4567787B2 (en) | 2010-10-20 |
WO2006134002A1 (en) | 2006-12-21 |
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