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EP1180595B1 - Système d'alimentation en carburant - Google Patents

Système d'alimentation en carburant Download PDF

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Publication number
EP1180595B1
EP1180595B1 EP01117817A EP01117817A EP1180595B1 EP 1180595 B1 EP1180595 B1 EP 1180595B1 EP 01117817 A EP01117817 A EP 01117817A EP 01117817 A EP01117817 A EP 01117817A EP 1180595 B1 EP1180595 B1 EP 1180595B1
Authority
EP
European Patent Office
Prior art keywords
fuel
valve
line
pressure
pump
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.)
Expired - Lifetime
Application number
EP01117817A
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German (de)
English (en)
Other versions
EP1180595B2 (fr
EP1180595A2 (fr
EP1180595A3 (fr
Inventor
Helmut Rembold
Karl Gmelin
Volkmar Goldschmitt
Jens Wolber
Mathias Schumacher
Edmund Schaut
Uwe Mueller
Markus Amler
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
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Filing date
Publication date
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Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP1180595A2 publication Critical patent/EP1180595A2/fr
Publication of EP1180595A3 publication Critical patent/EP1180595A3/fr
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Publication of EP1180595B1 publication Critical patent/EP1180595B1/fr
Publication of EP1180595B2 publication Critical patent/EP1180595B2/fr
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M37/00—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
    • F02M37/0047—Layout or arrangement of systems for feeding fuel
    • F02M37/0052—Details on the fuel return circuit; Arrangement of pressure regulators
    • 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
    • F02M37/00—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
    • F02M37/20—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines characterised by means for preventing vapour lock
    • 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
    • F04B23/00—Pumping installations or systems
    • F04B23/04—Combinations of two or more pumps
    • F04B23/08—Combinations of two or more pumps the pumps being of different types
    • F04B23/10—Combinations of two or more pumps the pumps being of different types at least one pump being of the reciprocating positive-displacement type
    • F04B23/103—Combinations of two or more pumps the pumps being of different types at least one pump being of the reciprocating positive-displacement type being a radial piston pump
    • 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
    • F04B23/00—Pumping installations or systems
    • F04B23/04—Combinations of two or more pumps
    • F04B23/08—Combinations of two or more pumps the pumps being of different types
    • F04B23/12—Combinations of two or more pumps the pumps being of different types at least one pump being of the rotary-piston positive-displacement 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
    • F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/22—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00 by means of valves
    • F04B49/24—Bypassing
    • 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
    • F02M37/00—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
    • F02M37/04—Feeding by means of driven pumps
    • F02M37/18—Feeding by means of driven pumps characterised by provision of main and auxiliary pumps

Definitions

  • the invention is based on a fuel supply system for supplying fuel to an internal combustion engine according to the preamble of claim 1.
  • fuel supply systems where one first fuel pump from a fuel tank Fuel via a fuel connection to a second Fuel pump promotes.
  • the second fuel pump in turn Promotes the fuel via a pressure line at least one fuel valve.
  • Number of fuel valves equal to the number of cylinders the internal combustion engine.
  • the fuel supply system can be built so that the fuel valve is the fuel injected directly into a combustion chamber of the internal combustion engine. When operating this fuel supply system is a high pressure in the pressure line leading to the fuel valve required. For safety reasons and never completely exclude leakage of the fuel valve in the combustion chamber, it is useful after stopping the Internal combustion engine the pressure in the fuel connection and in the pressure line of the fuel supply system all the way or at least largely reduce.
  • German patent application DE 195 39 885 A1 shows a Fuel supply system, in which for starting the internal combustion engine a valve means ensures that during startup, the first fuel pump the Fuel with increased feed pressure to the fuel valves supplies. In many cases, this increased Supply pressure off to the internal combustion engine in the shortest possible time to start. Due to the increased feed pressure can a possible gas bubble in the fuel connection between the first fuel pump and the second fuel pump in many cases are compressed so much that a safer Operation of the internal combustion engine is ensured. Nevertheless It can be particularly at high temperatures during the Operating the internal combustion engine and in particular also when the engine stopped at high temperature was, continue to startup problems and too Problems during operation of the internal combustion engine during high temperatures come.
  • the fuel supply system according to the invention with the Characteristic features of claim 1 provides the advantageous Possibility for particularly high heat load of the fuel in the fuel supply system, in particular but also with particularly high heat load especially the second fuel pump, to make sure that sufficient heat dissipation from the lines of Fuel supply system takes place and that no gas bubbles arise within the pipes.
  • Purge line can transfer fuel into the fuel tank be returned, which is an advantageous heat dissipation allows.
  • Due to the closable shut-off valve the removal of the fuel through the purge line increased pressure in the fuel connection between the both fuel pumps, allowing an effective rinse guaranteed and that it is further ensured that on Input to the second fuel pump no gas bubbles or Steam bubbles occur.
  • This will advantageously Reliably a performance drop especially the second Fuel pump reliable even at high temperature prevents and even at high temperature is a reliable Starting the internal combustion engine guaranteed.
  • FIG. 1 shows a first embodiment
  • the figure 2 a second embodiment
  • Figure 3 shows a third embodiment
  • FIG. 4 shows a detail
  • FIG. 5 a fourth embodiment
  • the figure 6 a fifth Embodiment
  • Figure 7 shows a sixth embodiment
  • 8 shows a seventh embodiment
  • the Figure 9 an eighth embodiment
  • the figure 10 a Detail view
  • Figure 11 shows a ninth embodiment
  • FIG. 12 shows a tenth embodiment.
  • the fuel supply system according to the invention for Metering of fuel for an internal combustion engine can at used different types of internal combustion engines become.
  • the internal combustion engine is for example a gasoline engine with outer or internal mixture formation and spark ignition, wherein the Engine with a reciprocating piston (reciprocating engine) or with a rotatably mounted piston (Wankel piston engine) can be provided.
  • the internal combustion engine can for example, be a hybrid engine. In this engine with charge stratification, the fuel-air mixture in the Area of the spark plug enriched so far that a safe ignition is guaranteed, combustion in the Medium but takes place in a strongly lean mixture.
  • the gas change in the combustion chamber of the internal combustion engine can for example, after the four-stroke process or after Two-stroke procedure done.
  • Gas exchange valves intake valves and exhaust valves
  • the internal combustion engine can be designed in such a way that at least one fuel valve directs the fuel injected into the combustion chamber of the internal combustion engine.
  • the Control of the power of the internal combustion engine takes place preferably by controlling the combustion chamber supplied Amount of fuel. But it can also be provided that the fuel valve the fuel at the inlet valve to Stove combustion chamber.
  • the for the Combustion of the fuel supplied to the combustion chamber air usually controlled by a throttle. About the Position of the throttle may be that of the internal combustion engine to be delivered power to be controlled.
  • the internal combustion engine has, for example, a cylinder with a piston, or it can with multiple cylinders and be provided with a corresponding number of pistons.
  • a fuel valve per cylinder is provided.
  • the fuel valves 16 are In professional circles often referred to as injectors or injectors.
  • the first fuel pump 6 has a pressure side 6h and a suction side 6n.
  • the second fuel pump 12 has a High pressure side 12h and a low pressure side 12n.
  • the fuel connection 10 leads from the pressure side 6h of the first Fuel pump 6 to the low pressure side 12n of the second Fuel pump 12. From the pressure side 6h of the first fuel pump 6 leads a channel back into the fuel tank 2. In this channel is the pressure relief valve 7th intended.
  • a pressure regulating valve 26 and a shut-off valve 30 is provided in the fuel line 22 .
  • the pressure regulating valve 26 and the shut-off valve 30 are effective behind each other connected. That is, the pressure regulating valve 26 and the shut-off valve 30 are in circuit series.
  • the Pressure control valve 26 and the valve device 30 can also compactly realized together in a common housing be.
  • the shut-off valve 30 has a first switching position 30 a and a second shift position 30b.
  • first switching position 30a may fuel from the fuel connection 10 through the fuel line 22 via the pressure regulating valve 26 in the Fuel tank 2 flow.
  • this switching position determines the pressure control valve 26 immediately the Feed pressure of the fuel in the fuel connection 10.
  • the check valve 30 is in its second switching position 30b, then the fuel can not go out immediately the fuel connection 10 to the pressure control valve 26 flow.
  • the first fuel pump 6 is driven by the electric motor 8 driven.
  • the first fuel pump 6, the pressure relief valve 7, the electric motor 8, the filter 24, the pressure control valve 26 and the shut-off valve 30 are in the area of the fuel tank 2. These parts are preferably arranged outside of the fuel tank 2 or are inside the fuel tank Second
  • the second Fuel pump 12 mechanically with an output shaft of a symbolically represented internal combustion engine 32 coupled.
  • the camshaft of the engine 32 serves as Output shaft. Since the second fuel pump 12 mechanically coupled to the output shaft of the internal combustion engine 32 is the second fuel pump 12 is proportional to Speed of the output shaft of the engine 32nd Weil the second fuel pump 12 spatially close to the housing the internal combustion engine 32 is flanged, is a strong Heating the internal combustion engine 32 to the second fuel pump 12 transmit, which is a relatively high heat load of the fuel in the fuel supply system caused.
  • the from the second fuel pump 12 to the fuel valves 16 leading pressure line 14 can simplify be divided into a line section 42, a Storage space 44 and into several distribution lines 46th Die Fuel valves 16 are each a distribution line 46 at the memory space 44 is connected.
  • a pressure sensor 48 is on connected to the memory space 44 and senses the respective pressure of the fuel in the pressure line 14th According to this pressure, the pressure sensor 48 inputs electrical signal to the controller 20.
  • Control device 20 electrically controllable control valve 50 connected to the storage space 44 of the pressure line 14 .
  • Fuel is from the pressure line 14 via a circulation line 52 on the low pressure side 12n of the second fuel pump 12 headed.
  • a hydraulic resistance element arranged between the control valve 50 and the Low pressure side 12n.
  • the resistance element is a check valve 53, which is towards the fuel connection 10 already opens at very low pressure difference.
  • the first fuel pump 6 is, for example about a driven by the electric motor 8 positive displacement pump, the type of construction per revolution a certain amount Fuel promotes.
  • the pressure of the fuel on the pressure side 6h of the first fuel pump 6 is hereinafter referred to as Supply pressure called.
  • Supply pressure the pressure of the fuel on the pressure side 6h of the first fuel pump 6
  • the pressure regulating valve 26 is For example, set to a differential pressure of 3 bar. So is the feed pressure in the fuel connection 10 with open shut-off valve 30 three bar (3 bar).
  • a purge line 60 leads from the second fuel pump 12 in the fuel tank 2. Inside the pump housing 12g is the purge line 60 with the low pressure side 12n of the fuel pump 12, as in FIG. 4 recognizable. In the course of the purge line 60 there is a hydraulic resistance. The hydraulic resistance is formed by a first overflow valve 61 and a second overflow valve 62. In the course of the circulation line 52nd there is a branch 63. At the junction 63 branches the Purge line 60 from the circulation line 52 from.
  • Preferably selected embodiment opens the purge line 60 at a junction 64 between the shut-off valve 30 and the pressure regulating valve 26 in the fuel line 22nd
  • the first spill valve 61 is at a relatively low Differential pressure, preferably set to 1 bar.
  • the second spill valve 62 is at a relative low differential pressure, preferably set to 1 bar. Because the set differential pressure at the two Overflow valves 61, 62 each chosen rather low can be for the overflow valves 61, 62 advantageously a fairly easy to build design be chosen without causing thereby large variations would result in the set differential pressure.
  • the first fuel pump 6 usually conveys a little more Fuel in the fuel connection 10 than from the second fuel pump 12 from the fuel connection 10th is removed. In normal operating condition of the flows excess fuel through the normally open Shut-off valve 30 and through the pressure regulating valve 26, so that in the fuel connection 10 due to the Differential pressure at the pressure control valve 26 adjusting feed pressure results.
  • shut-off valve 30 in the second switch position 30b, in which the direct connection of the fuel connection 10 is interrupted to the pressure control valve 26 is.
  • closed shut-off valve 30 flows excess, from the second fuel pump 12 from the Fuel connection 10 Unpicked fuel the pump housing 12g of the second fuel pump 12, through the first overflow valve 61, through the second overflow valve 62 and through the pressure regulating valve 26 back into the Fuel tank 2.
  • a feed pressure which is the sum of the differential pressures of Valves 61, 62 and 26 corresponds.
  • the pressure relief valve 7 for example set to a pressure higher than the sum of the Differential pressures of the valves 61, 62 and 26th
  • the fuel pump 12 has a dashed line in the drawing Lines indicated pump housing 12g.
  • the Overflow valves 61, 62, the check valve 53, the branch 63 and the sensor 65 are preferably within the pump housing 12g provided.
  • the sensor 65 is for example a temperature sensor and he can, for example, directly in the pump housing 12g or in Be arranged region of the pressure line 14. To measure the Temperature can instead of the sensor 65, for example, too the water temperature of the cooling water of the internal combustion engine 32 are used.
  • FIG. 2 shows a further, preferably selected, particularly advantageous exemplary embodiment.
  • the purge line 60 is in the in 2 illustrated embodiment downstream behind the second overflow valve 62 directly into the fuel tank 2 led.
  • the shut-off valve is closed 30 to obtain an equal charge pressure,
  • the differential pressure of the second spill valve 62 not to, for example, 1 bar as in the first embodiment, but for example set to 5 bar.
  • FIG. 3 shows a further, preferred, selected, particularly advantageous exemplary embodiment.
  • the differential pressure of the Overflow valve 66 for example, set to 2 bar.
  • FIG. 4 shows a longitudinal section through the second fuel pump 12.
  • the fuel pump 12 has at least one pump piston 12p.
  • the fuel pump 12 has three pump pistons 12p, for the sake of clarity only one is shown.
  • the fuel passes over the Fuel connection 10 in the interior of the pump housing 12g.
  • In the pump housing 12g is the low pressure side 12n and the at least one pump piston 12p.
  • the pump piston 12p is thus surrounded by the fuel, wherein the fuel has the same feed pressure as in the fuel connection 10.
  • At the highest point of the interior of the housing 12g of the fuel pump 12 branches off the purge line 60. This will ensure that is at the highest point in the pump housing 12g accumulating air through the purge line 60 is discharged to the fuel tank 2.
  • FIG. 5 shows a further, preferably selected, particularly advantageous exemplary embodiment.
  • the pressure relief valve 7 is set to 8 bar. The pressure relief valve 7 is located, viewed in the flow direction, even before the filter 24 to make sure a blockage at any point to no impermissible Overpressure in the fuel pump 6 leads.
  • the check valve 53 has a biasing spring.
  • shut-off valve 30 When the shut-off valve 30 in its closed position 30b, then flows from the first fuel pump 6 funded, but from the fuel valves 16 not removed excess fuel through the pressure relief valve 7 in the fuel tank 2, and a Part of the excess fuel delivered flows through the throttle 70 and through the pressure control valve 26 to the fuel tank 2. Because the pressure on the pressure relief valve 7 is set higher than the differential pressure at the pressure control valve 26 and because the flowing through the purge line 60 Fuel is additionally accumulated at the throttle 70, results in the fuel connection 10 when closed Shut-off valve 30, a feed pressure which is significantly higher than in normal operating condition with the shut-off valve open 30 occurring feed pressure.
  • choke 70 ensures that a certain proportion of the Fuel, this proportion being set accordingly Bias be selected at the check valve 53 can, even in normal operation constantly from the circulation line 52nd is returned to the fuel tank 2.
  • FIG. 6 shows a further, preferably selected, particularly advantageous exemplary embodiment.
  • Overflow valve 72 is formed.
  • the overflow valve 72 is For example, set it to a pending Differential pressure of 2 bar opens.
  • the check valve 53 is set so that, for example, already at very low differential pressure opens.
  • the check valve 30 is in the closed switch position 30b connected. This increases the feed pressure in the fuel connection 10 to a maximum to the pressure set at the pressure relief valve 7, and due This increased feed pressure will be the preload pressure of the Overflow valve 72 exceeded, and it flows fuel from the circulation line 52, via the overflow valve 72 and via the pressure control valve 26 in the fuel tank Second
  • FIG. 7 shows a further, preferably selected, particularly advantageous exemplary embodiment.
  • Deviating from the embodiment shown in FIG has the symbolically reproduced in the figure 7 Embodiment in the course of the circulation line 52 a another hydraulic resistance element.
  • the further Resistor element is a throttle 74.
  • the throttle 74 is hydraulically in series with the check valve 53. Viewed in the flow direction, the throttle can 74 in front of or behind the check valve 53.
  • the Throttle 74 and the check valve 53 are located downstream flow downstream of the branch 63 to Purge line 60.
  • throttle 74 can be achieved that, if at higher Speed of the engine 32 is a relatively large amount is pumped to fuel in the circulation line 52, before the throttle 74 creates a dynamic pressure and if this back pressure is large enough to the biased spill valve 72nd to overcome at least a portion of that of the second Fuel pump 12 pumped fuel into the fuel tank 2 flows back.
  • the embodiment shown in Figure 7 can thus Be agreed that at higher speed of the internal combustion engine 32 a part of the fuel from the circulation line 52 flows back into the fuel tank 2, without that by switching the shut-off valve 30 in his closed switching position 30b in the fuel connection 10 an increased feed pressure must be set.
  • this has the advantage that at increased speed of the internal combustion engine 32, which can often occur depending on the driving style, the first fuel pump 6 is not raised Supply pressure must work, what their durability clearly elevated.
  • the shut-off valve 30 only briefly, for example, only for Rinse the fuel lines during the start of the Internal combustion engine 32, in the closed switching position 30b are switched, which means that the fuel pump 6 only rarely corresponding to an increased feed pressure must work, what the durability of the fuel pump 6 significantly extended.
  • FIG. 8 shows a further, preferably selected, particularly advantageous exemplary embodiment.
  • the throttle 74 and the check valve 53 are in History of the circulation line 52 hydraulically behind the branch 63, at which the purge line 60 from the circulation line 52 branches off. Hydraulically considered are the throttle 74 and the check valve 53 parallel to each other.
  • the check valve 53 is provided with a closing spring biased. The check valve 53 opens only when due to a relatively high pressure medium flow at the Throttle 74 a sufficient for the opening of the check valve 53 large differential pressure is pending. The check valve 53 thus limits the pressure drop across the throttle 74.
  • Hydraulically downstream behind the junction 63rd is in the purge line 60 an additional hydraulic Resistance provided.
  • the additional hydraulic resistance is formed by a throttle 76.
  • the throttle 76 is hydraulically in series with the overflow valve 72 in front of or behind the overflow valve 72.
  • the check valve 53 and the spill valve 72nd can through the purge line 60 to the fuel tank 2 flowing fuel flow and the over the Circulation line 52 to the low pressure side 12n of the fuel pump 12 flowing fuel flow matched become. It can also be determined from which speed the engine 32 is a part of the by the circulation line 52 flowing fuel flow through the purge line 60 flows back to the fuel tank 2.
  • FIG. 9 shows a further, preferably selected, particularly advantageous exemplary embodiment.
  • FIG. 10 shows a detailed view of the exemplary embodiments illustrated in FIGS. 9, 11 and 12.
  • the second fuel pump 12 has a pump piston 12p, an input-side check valve 12a, a output side check valve 12b, a compression space 12k and a control valve 50 '.
  • the pressure damper 78 is preferably located within the pump housing 12g.
  • the resistance element is a check valve 80, that opens towards the fuel connection 10.
  • a Orifice 82 opens the circulation line 52 'in the fuel connection 10.
  • the circulation line 52 ' leads from the Compression space 12k, through the control valve 50 ', over the Branch 63 ', through the check valve 80 and over the Intersection 82 in the fuel connection 10.
  • the circulation line 52 ' runs a short distance directly inside of the pump housing 12g.
  • the control valve 50 ' has an open Switch position 50'a and a closed switching position 50'b.
  • branch 63 ' branches the purge line 60 off. Downstream past the branch 63 ' the purge line 60 a hydraulic resistance.
  • a hydraulic resistance is formed by a choke 84.
  • a leakage line 88 in the fuel line 22.
  • Downstream of the pressure control valve 26 is in the fuel line 22 a second shut-off valve 90.
  • the second shut-off valve 90 has an open switch position 90a and a closed switch position 90b.
  • the leakage line 88 opens between the Pressure control valve 26 and the second shut-off valve 90 at a junction 92 in the fuel line 22nd
  • the fuel is due to the normally high pressure in the pressure line 14 over the open control valve 50 'through the circulation line 52' and over the check valve 80 in the fuel connection 10th promoted.
  • the throttle 84 and the preloaded check valve 80 can be so coordinated that if during the compression stroke, the control valve 50 'is open, a Part of the fuel flowing through the circulation line 52 ' through the purge line 60 and via the pressure control valve 26 in the fuel tank 2 flows back.
  • Switching the control valve 50 'in the switching positions 50'a or 50'b can be that of the second fuel pump 12 in the pressure line 14 funded amount of fuel to be controlled.
  • the of the fuel pump 12 in the Pressure line 14 conveyed amount to be controlled so that in the pressure line 14 of the respective desired high pressure prevails, which can be sensed by the pressure sensor 48.
  • the control valve 50 ' is controlled.
  • the pressure relief valve 96 is provided, so that even at a Occurrence of an error, for example in the event of a fault Working the control valve 50 ', in the pressure line 14 no dangerous overpressure can occur.
  • the pressure relief valve 96 may also be electrically controllable, and so on, that depending on the operating condition of the pressure in the Storage space 44 can be quickly reduced.
  • shut-off valve 30 When the shut-off valve 30 in its open position 30a, then flows, as the throttle 84 and the pressure difference of the check valve 80 to each other are tuned, for example, only a very small part of the fuel flow passing through the circulation line 52 ' via the purge line 60 in the fuel tank. 2
  • the usually larger fuel flow flows through the Check valve 80 in the fuel connection 10, where the Pressure damper 78 is provided to the pulsating incoming Caching fuel.
  • shut-off valve 30 determines the pressure relief valve 7 the Feed pressure in the fuel connection 10. Because the pressure relief valve 7 to a higher pressure than the pressure control valve 26 is set, the feed pressure is closed Shut-off valve 30 higher than when the shut-off valve is open 30.
  • switch position 30b of the closed Shut-off valve 30 flows out of the compression chamber 12k by the control valve 50 'flowing fuel flow in Essentially through the throttle 84, through the purge line 60th in the fuel line 22 and from there into the fuel tank Second
  • the second While the engine 32 is operating, the second is Shut-off valve 90 usually in its open position 90a. If the engine 32 is turned off, then the second shut-off valve 90 is in its closed Switched position 90b, thereby a premature pressure reduction in the low pressure system across the gap between the pump piston 12p and the pump housing 12g avoid.
  • FIG. 11 shows a further, preferably selected, particularly advantageous exemplary embodiment.
  • the leakage line 88 without sharing the fuel line 22 in the fuel tank 2 led.
  • the Shut-off valve 90 is provided. Because through the leakage line 88 only a very small amount of the fuel flows, the many times smaller than the one through the fuel line 22 flowing fuel is sufficient for the shut-off valve 90 a very small and very easy to make Valve.
  • FIG. 12 shows a further, preferably selected, particularly advantageous exemplary embodiment.
  • the shut-off valve 30 downstream of the Pressure control valve 26 is arranged.
  • the purge line 60 branches out of the fuel connection 10 from. Downstream of the throttle 84, the leakage line opens 88 in the purge line 60 a.
  • the control valve 50 ' is via the circulation line 52' and over the junction 82 is connected to the fuel connection 10.
  • the control valve 50 'is in the closed Switch position 50'b held up in the pressure line 14 of the each desired pressure is reached.
  • FIGS. 1 to 8 become used especially when the second fuel pump 12 several pump piston 12p, usually three pump piston 12p, has.
  • the embodiments shown in Figures 9 to 12 are used in particular when the second fuel pump 12 a single pump piston 12p having.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Fuel-Injection Apparatus (AREA)
  • Output Control And Ontrol Of Special Type Engine (AREA)

Claims (14)

  1. Installation d'alimentation en carburant pour apporter du carburant à un moteur à combustion interne, comportant
    un réservoir de stockage de carburant (2),
    une première pompe à carburant (6),
    une deuxième pompe à carburant (12) et
    au moins une soupape de carburant (16),
    la première pompe à carburant (6) refoulant le carburant depuis le réservoir de stockage de carburant (2) jusque dans une liaison de carburant (10), alors que la deuxième pompe à carburant (12) refoule par l'intermédiaire d'une conduite de pression (14, 42, 44) le carburant depuis la liaison de carburant (10) jusqu'à la soupape de carburant (16) à l'aide de laquelle le carburant parvient au moins indirectement dans une chambre de combustion du moteur à combustion interne,
    une conduite de carburant (22) qui mène de la liaison de carburant (10) jusqu'au réservoir de stockage de carburant (2) et
    une soupape de réglage de pression (26) située dans la conduite de carburant (22),
    avec dans la conduite de carburant (22) une soupape d'arrêt (30) hydrauliquement en série avec la soupape de réglage de pression (26), et avec une conduite de balayage (60) qui mène le carburant au moins en partie par la deuxième pompe à carburant (12) et par une résistance (61, 62, 66, 70, 72, 76, 84) hydraulique jusqu'au réservoir de stockage de carburant (2),
    caractérisée en ce que
    la conduite de balayage (60) traverse un carter de pompe (12g) de la deuxième pompe à carburant (12).
  2. Installation d'alimentation en carburant selon la revendication 1,
    caractérisée en ce que
    la soupape d'arrêt (30) est commandée en fonction d'une température.
  3. Installation d'alimentation en carburant selon l'une des revendications précédentes,
    caractérisée en ce que
    la résistance (61, 62, 66, 70, 72, 76, 84) hydraulique est formée par une soupape (61, 62, 66, 72) qui s'ouvre en fonction de la pression.
  4. Installation d'alimentation en carburant selon l'une des revendications précédentes,
    caractérisée en ce que
    la résistance (61, 62, 66, 70, 72, 76, 84) hydraulique est formée par une soupape (70, 76, 84) dont la résistance à l'écoulement dépend du débit de fluide qui la traverse.
  5. Installation d'alimentation en carburant selon l'une des revendications précédentes,
    caractérisée en ce que
    la conduite de balayage (60) débouche hydrauliquement dans la conduite de carburant (22) entre la soupape d'arrêt (30) et la soupape de réglage de pression (26).
  6. Installation d'alimentation en carburant selon l'une des revendications précédentes,
    caractérisée en ce que
    une soupape de surpression (7) est prévue hydrauliquement en parallèle à la soupape de réglage de pression (26).
  7. Installation d'alimentation en carburant selon l'une des revendications précédentes,
    caractérisée en ce qu'
    une conduite de circulation (52, 52') mène de la conduite de pression (14, 42, 44) jusque dans la liaison de carburant (10) par l'intermédiaire d'une soupape de distribution (50, 50'), et
    la conduite de balayage (60) part de la conduite de circulation (52, 52').
  8. Installation d'alimentation en carburant selon la revendication 7,
    caractérisée en ce que
    la conduite de circulation (52, 52') mène dans la liaison de carburant (10) par l'intermédiaire d'un élément de résistance (53, 74, 80).
  9. Installation d'alimentation en carburant selon la revendication 7 ou 8,
    caractérisée en ce que
    la conduite de circulation (52, 52') mène dans la liaison de carburant (10) par l'intermédiaire d'un clapet antiretour (53, 80).
  10. Installation d'alimentation en carburant selon la revendication 9,
    caractérisée en ce que
    un étrangleur (74) est prévu hydrauliquement en parallèle au clapet antiretour (53).
  11. Installation d'alimentation en carburant selon la revendication 1,
    caractérisée en ce que
    la conduite de balayage (60) sort du carter de pompe (12g) à un point extrême du côté basse pression (12a) de la deuxième pompe à carburant (12).
  12. Installation d'alimentation en carburant selon la revendication 7,
    caractérisée en ce que
    la deuxième pompe à carburant (12) a une chambre de compression (12k), et la conduite de circulation (52') sort de la chambre de compression (12k).
  13. Installation d'alimentation en carburant selon l'une des revendications précédentes,
    caractérisée en ce qu'
    une conduite de fuite (88) va de la deuxième pompe à carburant (12) jusque dans le réservoir de stockage de carburant (2).
  14. Installation d'alimentation en carburant selon la revendication 13,
    caractérisée en ce que
    la conduite de fuite (88) débouche dans la conduite de carburant (22) en aval de la soupape d'arrêt (30).
EP01117817A 2000-08-16 2001-07-21 Système d'alimentation en carburant Expired - Lifetime EP1180595B2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10039773A DE10039773A1 (de) 2000-08-16 2000-08-16 Kraftstoffversorgungsanlage
DE10039773 2000-08-16

Publications (4)

Publication Number Publication Date
EP1180595A2 EP1180595A2 (fr) 2002-02-20
EP1180595A3 EP1180595A3 (fr) 2003-04-23
EP1180595B1 true EP1180595B1 (fr) 2005-06-15
EP1180595B2 EP1180595B2 (fr) 2011-02-23

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EP (1) EP1180595B2 (fr)
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DE (2) DE10039773A1 (fr)

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Also Published As

Publication number Publication date
US6792915B2 (en) 2004-09-21
JP4739599B2 (ja) 2011-08-03
DE50106502D1 (de) 2005-07-21
EP1180595B2 (fr) 2011-02-23
US20020092505A1 (en) 2002-07-18
EP1180595A2 (fr) 2002-02-20
EP1180595A3 (fr) 2003-04-23
JP2002098019A (ja) 2002-04-05
DE10039773A1 (de) 2002-02-28

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