EP1360406B1 - Systeme d'alimentation en carburant, procede pour le faire fonctionner, programme informatique ainsi qu'appareil de commande et/ou de regulation pour le piloter - Google Patents

Systeme d'alimentation en carburant, procede pour le faire fonctionner, programme informatique ainsi qu'appareil de commande et/ou de regulation pour le piloter Download PDF

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Publication number
EP1360406B1
EP1360406B1 EP02708213A EP02708213A EP1360406B1 EP 1360406 B1 EP1360406 B1 EP 1360406B1 EP 02708213 A EP02708213 A EP 02708213A EP 02708213 A EP02708213 A EP 02708213A EP 1360406 B1 EP1360406 B1 EP 1360406B1
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EP
European Patent Office
Prior art keywords
fuel
fuel pump
valve device
internal combustion
combustion engine
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
EP02708213A
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German (de)
English (en)
Other versions
EP1360406A1 (fr
Inventor
Helmut Rembold
Jens Wolber
Uwe Mueller
Markus Amler
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Robert Bosch GmbH
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Robert Bosch GmbH
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Publication of EP1360406A1 publication Critical patent/EP1360406A1/fr
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    • 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
    • F02D41/3809—Common rail control systems
    • F02D41/3836—Controlling the fuel pressure
    • F02D41/3845—Controlling the fuel pressure by controlling the flow into the common rail, e.g. the amount of fuel pumped
    • F02D41/3854—Controlling the fuel pressure by controlling the flow into the common rail, e.g. the amount of fuel pumped with elements in the low pressure part, e.g. low pressure pump
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D33/00—Controlling delivery of fuel or combustion-air, not otherwise provided for
    • F02D33/003—Controlling the feeding of liquid fuel from storage containers to carburettors or fuel-injection apparatus ; Failure or leakage prevention; Diagnosis or detection of failure; Arrangement of sensors in the fuel system; Electric wiring; Electrostatic discharge
    • F02D33/006—Controlling the feeding of liquid fuel from storage containers to carburettors or fuel-injection apparatus ; Failure or leakage prevention; Diagnosis or detection of failure; Arrangement of sensors in the fuel system; Electric wiring; Electrostatic discharge depending on engine operating conditions, e.g. start, stop or ambient conditions
    • 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
    • F02D41/02—Circuit arrangements for generating control signals
    • F02D41/04—Introducing corrections for particular operating conditions
    • F02D41/042—Introducing corrections for particular operating conditions for stopping the engine
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • 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
    • F02M37/0011—Constructional details; Manufacturing or assembly of elements of fuel systems; Materials therefor
    • F02M37/0023—Valves in the fuel supply and return system
    • F02M37/0035—Thermo sensitive valves
    • 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
    • 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
    • F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
    • F02M55/04—Means for damping vibrations or pressure fluctuations in injection pump inlets or outlets
    • 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
    • F02M59/38—Pumps characterised by adaptations to special uses or conditions
    • F02M59/42—Pumps characterised by adaptations to special uses or conditions for starting of engines
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
    • F02M59/44—Details, components parts, or accessories not provided for in, or of interest apart from, the apparatus of groups F02M59/02 - F02M59/42; Pumps having transducers, e.g. to measure displacement of pump rack or piston
    • F02M59/442—Details, components parts, or accessories not provided for in, or of interest apart from, the apparatus of groups F02M59/02 - F02M59/42; Pumps having transducers, e.g. to measure displacement of pump rack or piston means preventing fuel leakage around pump plunger, e.g. fluid barriers
    • 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
    • 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
    • F04B53/04—Draining
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D2200/00—Input parameters for engine control
    • F02D2200/02—Input parameters for engine control the parameters being related to the engine
    • F02D2200/06—Fuel or fuel supply system parameters
    • F02D2200/0606—Fuel temperature
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D2250/00—Engine control related to specific problems or objectives
    • F02D2250/02—Fuel evaporation in fuel rails, e.g. in 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
    • 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

Definitions

  • the invention first relates to a fuel system for Supply of fuel for an internal combustion engine, with a reservoir, a first fuel pump, which is connected on the input side to the storage container, one second fuel pump, which on the input side with the first fuel pump is connected to at least one Injector, which is connected to the second fuel pump is connected and fuel at least indirectly one Can feed combustion chamber, and with one between the second Provided the fuel pump and the reservoir Leakage line.
  • Such a fuel system is known from the market see e.g. US-A-5558068.
  • a first promotes Fuel pump from a fuel storage tank Fuel through a fuel line to a second one Fuel pump.
  • the second fuel pump is is a high-pressure fuel pump, which the Fuel under very high pressure in a fuel rail (also called “rail"). From there the fuel reaches at least one injection valve, through which the fuel finally enters the combustion chamber arrives.
  • the number of injectors is usually the same the number of cylinders of the internal combustion engine.
  • the Fuel system can be built so that Fuel injector directly into a combustion chamber the internal combustion engine injects.
  • the fuel system is a 1-cylinder piston pump used. Via the leakage line becomes leakage fuel which passes through the gap between Cylinder and piston pass through from the high pressure fuel pump returned to the reservoir. This relieves the piston seal of the 1-cylinder piston pump used.
  • a fundamental problem with fuel systems is that Supply of the combustion chambers of the internal combustion engine with Fuel during starting.
  • a valve device ensures that the first fuel pump during the starting process Fuel with increased feed pressure to the Injectors supplies. In many cases this is enough increased feed pressure to the internal combustion engine in start in no time. Due to the increased feed pressure there may be a gas bubble in the fuel connection between the first fuel pump and the second Fuel pump to be compressed in many cases that safe operation of the internal combustion engine is guaranteed.
  • the present invention has the task of a Fuel system of the type mentioned above to further that the starting and operating behavior of a internal combustion engine equipped with the fuel system gets better at high operating temperatures and that Service life of the fuel system is as long as possible.
  • valve device with Shut-off function in the leakage line By providing a valve device with Shut-off function in the leakage line is achieved that after switching off the engine the increased Form in the fuel connection between the first and second fuel pump is maintained.
  • a Blockage of the leakage line after switching off the Internal combustion engine is namely prevented from fuel through the gap between the movable pump element and the limitation of the pump chamber of the second fuel pump passes through and flows back to the reservoir. This would cause a gradual decrease in pressure in the Fuel connection upstream of the second Run the fuel pump.
  • Maintaining pressure prevents that after turning off one is called Internal combustion engine in the connection between the first and the second fuel pump can form gas bubbles.
  • Such gas bubbles occur when the in the Fuel lines between the fuel pumps located fuel due to heat conduction from the Internal combustion engine heated up.
  • the pressure is like this is possible with the fuel system according to the invention is, even with an internal combustion engine turned off can maintain the formation of such gas bubbles largely avoided what the starting behavior of a equipped with the fuel system according to the invention Internal combustion engine significantly improved.
  • the shut-off function the valve device can be controlled electrically. This allows that when from the engine control is signaled that the internal combustion engine is turned off, the shut-off function of the Valve device with a simple control signal is activated.
  • valve device to provide the Pressure limiting function preloaded and to suspension the shut-off function against the preload force electrically actuatable valve element comprises.
  • valve device in the Field of the internal combustion engine in particular in the area of second fuel pump is arranged.
  • valve device in the housing to accommodate the second fuel pump.
  • the Leakage line is therefore largely depressurized. Owing to Heat conduction from the hot internal combustion engine fuel in the leakage line as well warmed and evaporated. After turning off the The internal combustion engine is therefore in the leakage line initially only vapor fuel.
  • the Shut-off function of the valve device activated and the Leakage line closed, then would be, with an arrangement the valve device remote from the second fuel pump, initially a substantial vaporous fuel volume in the closed system between the first fuel pump, second fuel pump and the valve device available.
  • a substantial vaporous fuel volume in the closed system between the first fuel pump, second fuel pump and the valve device available.
  • fuel from the pump room for example via a piston guide gap of the second fuel pump (Gap between piston and housing), which in turn can lead to the formation of steam in the pump room.
  • the Valve device as close as possible to the second Fuel pump arranged, then this is vapor In any case, the fuel volume is very small and can thus not when the engine is restarted Cause problems.
  • valve device in the Area of the storage container is arranged.
  • a throttle point provided by the input of the second fuel pump leads to the leakage line.
  • the Cross section of the throttle point selected so that in Normal operation the increase in the temperature of the Reservoir is smaller than a limit.
  • the first fuel pump second fuel pump a larger amount of fuel supplied as again by the second fuel pump is promoted.
  • This excess fuel will in the present embodiment over the in the second Fuel pump, preferably for example in the Housing wall, existing bypass line past the pump room and led to the start of the leakage line.
  • a constant flushing flow through the Leakage line passed through This prevents there is fuel in the leakage line for a long time and can be heated by the leakage line so that it evaporated.
  • the invention further relates to a method for operating the fuel system of the type mentioned above.
  • the effect the proposed valve device is optimal if the shut-off function of the valve device immediately activated after switching off the internal combustion engine and immediately after starting the internal combustion engine is deactivated. Activation of the shut-off function of the Valve device closes the Valve device, whereas the deactivation of the Shut-off function for opening the valve device leads.
  • the Valve device is the shut-off function of the Valve device preferably in the de-energized state activated, whereas deactivated when energized is.
  • this The first fuel pump remains after the procedure Parking the engine for a limited time Period in operation. This ensures that the pressure in the corresponding area of the The fuel system by the opening pressure of the Pressure limiting function of the valve device specified corresponds to maximum pressure.
  • the parameters are Cooling water temperature and / or an intake air temperature and / or includes a speed and / or a load.
  • the pressure at the inlet of the second fuel pump can rise to particularly simple way about the speed of the first fuel pump can be set.
  • the invention further relates to a computer program which to carry out the procedure of the type mentioned above is suitable if it is running on a computer. It is particularly preferred if the computer program on a memory, in particular on a flash memory, is saved.
  • the invention relates to a control and / or Control device for controlling the above Fuel system, where it is proposed that Control and / or regulating device with a computer program type described above is provided.
  • a fuel system as a whole carries that Reference numeral 10. It includes a low pressure area 12 and a high pressure area 14.
  • the fuel 18 is from the Reservoir 16 from a first fuel pump 20 promoted.
  • This is an electrical one Fuel pump, which is controlled by a clock module 22 becomes.
  • the electric fuel pump 20 delivers in a Low pressure fuel line 24. In this is after the electric fuel pump 20 in the flow direction first seen a check valve 26 and then a Filter 28 arranged. Seen before in the flow direction check valve 26 branches from the low pressure fuel line 24 from a branch line 30, which to Returns reservoir 16.
  • the branch line 30 branches into two parallel branches 30a and 30b.
  • in the Branch 30a is a pressure relief valve 32 is arranged, whereas a throttle 34 is provided in branch 30b.
  • the Pressure in the low pressure fuel line 24 is from a pressure sensor 36 is detected.
  • the low pressure fuel line 24 leads to a second one Fuel pump 38. This will not be discussed here illustrated way of the crankshaft one Internal combustion engine (not shown) driven.
  • the second fuel pump 38 is a single-piston high-pressure pump. Upstream of the high pressure pump 38 are still in the low pressure fuel line 24 Pressure damper 40 and a check valve 42 are arranged.
  • the high-pressure pump 38 pumps into a Fuel line 44, which via a check valve 46 leads to a fuel rail 48.
  • a fuel rail 48 To the Fuel manifold 48 are again fuel injectors 50 connected which the fuel in a combustion chamber, not shown, of the internal combustion engine inject.
  • the pressure in the fuel rail 48 is detected by a pressure sensor 52.
  • a pressure relief valve 54 provided which fluidically in turn via a line 55 is connected to the low pressure fuel line 24.
  • the Pressure in the fuel line 44 and the fuel rail 48, that is in the high pressure region 14 of the Fuel system 10, is via a quantity control valve 56 controlled which between the check valve 46 and the high pressure pump 38 located area of Fuel line 44 with between the check valve 42 and the pressure damper 40 area of the Low pressure fuel line 24 connects.
  • the fuel system 10 also includes a control and Control device 58, which i.a. Signals from one Receives temperature sensor 60 with which the temperature of the Cooling water of the internal combustion engine is detected.
  • a sensor 62 for detecting the Intake air temperature provided, which also signals outputs to the control and regulating device 58.
  • a sensor 64 provides the control and regulating device 58 with information about the speed of the internal combustion engine and a sensor 66 corresponding information regarding the current load the internal combustion engine.
  • the tax and Control device 58 still signals from the pressure sensor 36 of the Low pressure area 12 of the fuel system 10 and from Pressure sensor 52 of the high pressure region 14 of the Fuel system 10.
  • a leakage line 68 leads from the high pressure pump 38 back to the storage container 16.
  • a Valve device 70 available in the leakage line 68.
  • a shut-off function 72 and a Pressure relief function 74 that are parallel to each other are switched.
  • the High pressure pump around a single piston pump.
  • the piston carries in Fig. 2, reference numeral 76. It is over a Cam drive 78 driven.
  • the piston 76 is in one Cylinder housing 80 performed.
  • the top of the piston 76 and the cylinder housing 80 delimit a pump chamber 82 Pump chamber 82 is opposite the cam drive 78 by a Gasket sealed between the piston 76 and the cylinder housing 80 is formed.
  • one Piston seal 84 fixed to the housing is provided.
  • the Leakage line 68 branches directly from an annular groove 86 Above the piston seal 84. This will in Operation relieves the piston seal 84.
  • valve member 88 there is only one in the valve device 70 Valve member 88 available, which for the shut-off function 72 as well as used for the pressure limiting function 74 becomes.
  • the valve member 88 comprises an elongated one Housing 89 guided piston 90, which at its in Fig. 2nd upper end a plate 92 made of a soft magnetic Material carries.
  • the plate 92 is supported by a compression spring 94 acts through which the lower end face of the Piston 90 of the valve member 88 against an annular web 96 is acted upon in a flow space 98 behind an inlet 100 of the valve device 70 is formed.
  • At the A radial outlet 102 is provided in flow space 98, to the section leading to the reservoir 16 Leakage line 68 is connected.
  • the housing 89 of the valve device 70 is upward completed by a cover 104, which on its the inside of the valve member 88 facing one has concentric annular groove (without reference numerals) in the an annular electromagnet 106 is inserted.
  • the Cover 104 of valve device 70 is with housing 89 permanently connected by caulking 108.
  • the fuel system 10 shown in FIGS. 1 and 2 works as follows:
  • the pressure sensor 52 and the quantity control valve 56 are part a closed controlled system, over which the of the High pressure pump 38 in the high pressure area 14 of the Fuel system 10 delivered fuel amount set becomes.
  • the valve device 70 is the control and Control device 58 controlled so that a free flow through the leakage line 68 from the high pressure pump 38 to Storage container 16 is possible.
  • the control and Regulation takes place according to a computer program, which in the Control and regulating device is stored. This is it possible that fuel which through the gap seal between piston 76 and cylinder housing 80 through to Annular groove 86 passes through the leakage line 68 to Reservoir 16 can flow back. This will achieved that the piston seal 84 is relieved of pressure.
  • the opening of the valve device 70 that is Deactivation of the shut-off function 72 will achieved that the ring magnet 106 is energized.
  • the Ring magnet 106 thus pulls the soft magnetic plate 92 which, in turn, plunger 90 from one valve seat forming ring web 96 stands out.
  • the control and Control device 58 via the temperature sensor 60 for the Cooling water checked whether the internal combustion engine is hot. is if this is the case, the shut-off function 72 becomes the Valve device 70 from the control and regulating device 58 disabled.
  • the ring magnet 106 is thus de-energized, whereby the piston 90 by the compression spring 94 against the ring web 96 is pressed.
  • the path from the high pressure pump 38 over the Leakage line 68 to the reservoir 16 is thus blocked.
  • the control and regulating device 58 the module 22 of the electric fuel pump 20 so controlled that the electrical for a short period of time Fuel pump 20 continues to operate. this leads to an increase in the pressure of the fuel in the Low pressure fuel line 24 to that through the Pressure relief valve 32 and the pressure relief function 74 of the valve device 70 predetermined maximum pressure.
  • valve device 70 predetermined maximum pressure and the by the Pressure relief valve 32 predetermined maximum pressure in are about the same.
  • the pressure relief function 74 of the Valve device 70 is provided in that at a pressure difference between the inlet 100 and the Outlet 102 of the valve device 70 against the piston 90 the biasing force of the compression spring 94 is applied. If the pressure difference exceeds a certain level, the Piston 90 from ring web 96. This clears the way for am Inlet 100 of the valve device 70 under positive pressure standing fuel.
  • the leakage line 68 and the one arranged in it Valve device 70 thus make it possible for Turning off a hot internal combustion engine is an elevated one Pressure in the low pressure fuel line 24 can be maintained without any risk to damage to components in the low pressure region 12 of the fuel system 10 due to a Heating of the low-pressure fuel line 24 fuel is there.
  • the starting behavior of a hot internal combustion engine is through such Fuel system 10 thus significantly improved without that the life of the components would be affected.
  • valve device 70 is not in the Near the high pressure pump 38, but in the area of Storage container 16 arranged. Furthermore, in the area of High-pressure pump 38 provided a bypass line 110, which from one between the pressure damper 40 and the Check valve 42 of the low pressure fuel line 24 to an area between the high pressure pump 38 and the valve device 70 area of FIG Leakage line 68 leads. There is one in the bypass line 110 Throttle 112 arranged. The bypass line 110 and the Choke 112 is available for the following reason:
  • valve device 70 If the valve device 70, as in the present Embodiment, not near the high pressure pump 38 is arranged, it can during normal operation of the fuel system 10 come through Heat conduction from the internal combustion engine Leakage line 68 and the one located in it Fuel to be warmed. Because in normal operation, yes Valve device 70 is open, is then in the Leakage line 68 fuel essentially depressurized. Because of the heating, this fuel can be in the leakage line 68 thus evaporate. Now after the Turning off the internal combustion engine, the valve device 70 closed, that would also be located in the leakage line 68 included steam bubble included. This could be the case with Restarting leads to a problem.
  • bypass line 110 is also used in normal operation fuel at the pump chamber 82 High pressure pump 38 over into the leakage line 68 introduced therein. This is possible because of the electrical High pressure pump 38 fuel pump 20 normally one provides more fuel than from this further into the high pressure area 14 of the fuel system 10 is promoted. During normal operation of the fuel system 10 is a more or less constant Fuel flow through the leakage line 68 to Reservoir 16 back on. This will, on the one hand avoided that "standing" in the leakage line 68 Fuel warms up and evaporates, and on the other hand becomes achieved that possibly already formed vapor bubbles to the Storage container 16 are rinsed out.
  • Valve device 70 in the area of the storage container 16 can be arranged, sometimes for space reasons is desirable and at the same time becomes a safe one Hot start behavior and reliable operation of the Internal combustion engine enables.
  • FIG. 4 is another exemplary embodiment of a Fuel system 10 shown. Here too wear such Elements and parts which have equivalent functions to those in 1-3 illustrated embodiments have the same reference numerals and are not explained again in detail.
  • Fig. 4 Embodiment In contrast to that shown in Fig. 3 Embodiment is in that shown in Fig. 4 Embodiment between the filter 28 and the Pressure damper 40 located area of the low pressure fuel line 24 via a connecting line 114 Shut-off valve 116 and a pressure control valve 118 with the between the high pressure pump 38 and the valve device 70 located area of the leakage line 68 connectable. Further is the line 55 in which the quantity control valve 56 is arranged via a flush line 120 with the between the shut-off valve 116 and the pressure control valve 118 area of the connecting line 114 connected. In A throttle 122 is arranged in the flushing line 120.

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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)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)

Abstract

L'invention concerne un système d'alimentation en carburant (10) servant à alimenter un moteur à combustion en carburant (18). Ce système comprend un réservoir (16) et une première pompe à carburant (20) reliée au réservoir (16) côté alimentation. Une deuxième pompe à carburant (38) est reliée à la première (20) côté alimentation. En outre, au moins une soupape d'injection (50), reliée à la deuxième pompe à carburant (38), achemine du carburant au moins indirectement vers une chambre de combustion. Une conduite de retour de fuites (68) se trouve entre la deuxième pompe à carburant (38) et le réservoir (16). L'invention vise à assurer un démarrage à chaud du moteur à combustion sans forte sollicitation des composants. A cet effet, la conduite de retour de fuites (68) est dotée d'un dispositif de soupape (70) avec fonction de blocage (72) et fonction de limitation de pression (74) montées en parallèle.

Claims (14)

  1. Système d'alimentation en carburant (10) pour fournir du carburant (18) à un moteur à combustion interne, comprenant un réservoir d'alimentation (16), une première pompe à carburant (20) dont l'entrée est reliée au réservoir d'alimentation (16), une seconde pompe à carburant (38) dont l'entrée est reliée à la première pompe à carburant (20) ainsi qu'au moins un injecteur (50) relié à la seconde pompe à carburant (38) dont le carburant (18) est fourni au moins indirectement à une chambre de combustion, ainsi qu'une conduite de fuite prévue entre la seconde pompe à carburant et le réservoir d'alimentation,
    caractérisé en ce que
    la conduite de fuite (68) comporte une installation de vanne (70) avec une fonction d'arrêt (72) et de limitation de pression (74) branchée en parallèle.
  2. Système d'alimentation en carburant (10) selon la revendication 1,
    caractérisé en ce que
    l'installation de vanne (70) utilise le même organe de vanne (88) pour les deux fonctions (72, 74).
  3. Système d'alimentation en carburant (10) selon l'une des revendications précédentes,
    caractérisé en ce que
    la fonction d'arrêt (72) de l'installation de vanne (70) est commandée électriquement.
  4. Système d'alimentation en carburant (10) selon la revendication 3,
    caractérisé en ce que
    pour assurer la fonction de limitation de pression (74) l'installation de vanne (70) comporte un élément précontraint (94) et pour neutraliser la fonction d'arrêt (72) elle comporte un élément (88) actionné électriquement contre la force de précontrainte.
  5. Système d'alimentation en carburant (10) selon l'une des revendications précédentes,
    caractérisé en ce que
    l'installation de vanne (70) est prévue au niveau du moteur à combustion interne notamment au niveau de la seconde pompe à carburant (38).
  6. Système d'alimentation en carburant (10) selon l'une des revendications précédentes,
    caractérisé en ce que
    l'installation de vanne (70) est prévue au niveau du réservoir d'alimentation (16) et la seconde pompe à carburant (38) comporte une conduite de dérivation (110) avec un point d'étranglement (112) reliant l'entrée de la seconde pompe à carburant (38) à la conduite de fuite (68) et la section du point d'étranglement (112) est choisie pour qu'en fonctionnement normal, l'élévation de température du carburant (18) dans le réservoir d'alimentation (16) est inférieure à une valeur limite.
  7. Procédé de mise en oeuvre d'un système d'alimentation en carburant (10) selon l'une des revendications précédentes,
    caractérisé en ce que
    la fonction d'arrêt (72) de l'installation de vanne (70) est activée immédiatement après l'arrêt du moteur à combustion interne et cette fonction est neutralisée directement après le démarrage du moteur à combustion interne.
  8. Procédé selon la revendication 7,
    caractérisé en ce que
    la première pompe à carburant (20) reste en fonctionnement pendant une durée limitée après l'arrêt du moteur à combustion interne.
  9. Procédé selon l'une des revendications 7 ou 8,
    caractérisé en ce qu'
    on saisit les paramètres (60, 62, 64, 66) caractéristiques d'un démarrage à chaud du moteur à combustion interne et la commande de la première pompe à carburant (20) et/ou de l'installation de vanne (70) se fait en fonction des paramètres saisis.
  10. Procédé selon la revendication 9,
    caractérisé en ce que
    les paramètres comprennent la température de l'eau de refroidissement (60) et/ou la température de l'air aspiré (62) et/ou la vitesse de rotation (64) et/ou la charge (66) du moteur à combustion interne.
  11. Procédé selon les revendications 7 à 10,
    caractérisé en ce qu'
    on règle la pression à l'entrée de la seconde pompe à carburant (38) en fonction de la vitesse de rotation de la première pompe à carburant (20).
  12. Programme d'ordinateur
    caractérisé en ce qu'
    il est exécuté sur un ordinateur pour exécuter le procédé selon l'une des revendications 7 à 11.
  13. Programme d'ordinateur selon la revendication 12,
    caractérisé en ce qu'
    il est enregistré dans une mémoire, notamment une mémoire flash.
  14. Appareil de commande et/ou de régulation (58) pour commander et/ou réguler le système d'alimentation en carburant (10) selon l'une des revendications 1 à 6,
    caractérisé en ce qu'
    il comporte un programme d'ordinateur selon l'une des revendications 12 ou 13.
EP02708213A 2001-02-08 2002-02-06 Systeme d'alimentation en carburant, procede pour le faire fonctionner, programme informatique ainsi qu'appareil de commande et/ou de regulation pour le piloter Expired - Lifetime EP1360406B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10106095A DE10106095A1 (de) 2001-02-08 2001-02-08 Kraftstoffsystem, Verfahren zum Betreiben des Kraftstoffsystems, Computerprogramm sowie Steuer- und/oder Regelgerät zur Steuerung des Kraftstoffsystems
DE10106095 2001-02-08
PCT/DE2002/000427 WO2002063158A1 (fr) 2001-02-08 2002-02-06 Systeme d'alimentation en carburant, procede pour le faire fonctionner, programme informatique ainsi qu'appareil de commande et/ou de regulation pour le piloter

Publications (2)

Publication Number Publication Date
EP1360406A1 EP1360406A1 (fr) 2003-11-12
EP1360406B1 true EP1360406B1 (fr) 2004-06-30

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Country Status (6)

Country Link
US (1) US6769414B2 (fr)
EP (1) EP1360406B1 (fr)
JP (1) JP2004518071A (fr)
KR (1) KR20020086739A (fr)
DE (2) DE10106095A1 (fr)
WO (1) WO2002063158A1 (fr)

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US20030154959A1 (en) 2003-08-21
KR20020086739A (ko) 2002-11-18
WO2002063158A1 (fr) 2002-08-15
DE10106095A1 (de) 2002-08-29
US6769414B2 (en) 2004-08-03
JP2004518071A (ja) 2004-06-17
EP1360406A1 (fr) 2003-11-12
DE50200579D1 (de) 2004-08-05

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