EP1126157B1 - Fuel supply device for an internal combustion engine of a vehicle - Google Patents

Fuel supply device for an internal combustion engine of a vehicle Download PDF

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Publication number
EP1126157B1
EP1126157B1 EP00127411A EP00127411A EP1126157B1 EP 1126157 B1 EP1126157 B1 EP 1126157B1 EP 00127411 A EP00127411 A EP 00127411A EP 00127411 A EP00127411 A EP 00127411A EP 1126157 B1 EP1126157 B1 EP 1126157B1
Authority
EP
European Patent Office
Prior art keywords
fuel
pressure
valve
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 - Fee Related
Application number
EP00127411A
Other languages
German (de)
French (fr)
Other versions
EP1126157A2 (en
EP1126157A3 (en
Inventor
Klaus Joos
Jens Wolber
Thomas Frenz
Markus Amler
Hansjoerg Bochum
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
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to DE2000106622 priority Critical patent/DE10006622A1/en
Priority to DE10006622 priority
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP1126157A2 publication Critical patent/EP1126157A2/en
Publication of EP1126157A3 publication Critical patent/EP1126157A3/en
Application granted granted Critical
Publication of EP1126157B1 publication Critical patent/EP1126157B1/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02MSUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M37/00Apparatus 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
    • F02M37/04Feeding by means of driven pumps
    • F02M37/08Feeding by means of driven pumps electrically driven
    • F02M37/10Feeding by means of driven pumps electrically driven submerged in fuel, e.g. in reservoir
    • F02M37/106Feeding by means of driven pumps electrically driven submerged in fuel, e.g. in reservoir the pump being installed in a sub-tank
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02MSUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M37/00Apparatus 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
    • F02M37/02Feeding by means of suction apparatus, e.g. by air flow through carburettors
    • F02M37/025Feeding by means of a liquid fuel-driven jet pump

Description

    State of the art
  • The invention relates to a fuel supply device for an internal combustion engine of a motor vehicle according to the preamble of claim 1.
  • Such a fuel supply device is known from DE 28 08 731 C2. This fuel supply device has an electric motor-driven delivery unit, is conveyed by the fuel from a reservoir to an injection system of the internal combustion engine. In addition, a pressure sensor is provided, through which the fuel pressure is detected downstream of the delivery unit. The pressure sensor is connected to a control device, by which the operation of the electric motor of the delivery unit is controlled such that the fuel pressure downstream of the delivery unit is at least approximately equal to a predetermined target pressure. By the delivery unit only the amount of fuel is thereby promoted, which is consumed by the internal combustion engine, so that no return amount of the internal combustion engine is present in the reservoir back. Downstream of the pressure sensor, a throttled sequence is present, so that during operation of the delivery unit, a subset of the subsidized by this fuel is derived. This allows operation of the delivery unit even if the fuel demand of the internal combustion engine is very low. In particular, during and after the starting of the internal combustion engine, the delivery unit does not yet provide the full capacity, wherein a subset of funded by the pumping unit fuel is discharged through the throttled flow, so that under certain circumstances, the internal combustion engine supplied fuel amount is not sufficient. Moreover, fuel can flow out through the throttled sequence when the internal combustion engine is switched off, so that the fuel pressure in the injection system of the internal combustion engine drops.
  • US 4,559,968 discloses a fuel supply device with a pressure relief valve. The pressure relief valve has a valve seat cooperating with a valve member which is moved in the direction of the valve seat after the switching off of the internal combustion engine, wherein it is immersed in an outlet opening shortly before placing on the valve seat. Characterized a throttling of the flow during the closing operation of the pressure limiting valve is effected, so that it closes with a time delay.
  • The US 5,785,025 discloses a fuel supply device with a delivery unit that promotes fuel via a pressure line to an injection system, wherein excess fuel is passed through a arranged in a drain pressure relief valve back into the fuel tank. The delivery unit is regulated by means of a control device connected to a pressure sensor. The process is unthrottled, so that there is no time-constant volume flow, which flows back into the storage tank.
  • From DE 44 43 836 A1 discloses a device for supplying fuel is known in which a pressure regulator and a downstream valve is provided in the process, wherein a throttle is arranged parallel to the valve.
  • US 5,197,444 shows a fuel delivery device with a control valve in the drain.
  • Advantages of the invention
  • The fuel supply device according to the invention with the features of claim 1 has the advantage that the throttled flow is opened only by the valve means when the fuel pressure has at least approximately reached the predetermined target pressure, so that in particular for and after the start of the entire funded by the delivery unit amount of fuel is promoted to the internal combustion engine. In addition, it is ensured by the valve means that when the internal combustion engine of the throttled flow is closed and the fuel pressure in the injection system is at least approximately maintained at the predetermined target pressure. If, when the internal combustion engine is switched off, as a result of heating of the fuel, a pressure increase occurs, then this can be relieved by the valve device.
  • In the dependent claims advantageous refinements and developments of the fuel supply device according to the invention are given. The training according to claim 3 offers the advantage that by the Pressure sensor, the actual fuel pressure is detected in the injection system, which may be lower than the fuel pressure upstream of the fuel filter, for example, due to contamination of the fuel filter.
  • drawing
  • An embodiment of the invention is illustrated in the drawing and explained in more detail in the following description. 1 shows a fuel supply device for an internal combustion engine of a motor vehicle in a schematic representation.
  • Description of the embodiment
  • In the figure, a fuel supply device for an internal combustion engine 10 of a motor vehicle is shown. The internal combustion engine 10 has an injection system through which fuel is injected into the cylinders of the internal combustion engine. The motor vehicle has a fuel tank 12, in which the fuel supply device is arranged substantially. The fuel supply device has a delivery unit 14, which has an electric motor 16 as a drive, through which a pump part 18 is driven. The electric motor 14 and the pump part 18 are arranged in a common housing 20. In the delivery unit 14, a check valve 22 is integrated, which is arranged for example in a discharge from the housing 20 pressure port 24. The check valve 22 opens in the conveying direction of the delivery unit 14 to the engine 10 and closes in the opposite direction, so that no fuel can flow back into the delivery unit 14 of the internal combustion engine 10. In the delivery unit 14, a pressure relief valve 26 is also integrated, which is located upstream of the check valve 22. The pressure relief valve 26 is set to an opening pressure that is substantially higher than the fuel pressure that normally occurs when the components of the fuel supply device are functioning correctly downstream of the delivery unit 14. If disturbances such as clogging or kinking of lines, the fuel pressure rises sharply, so opens the pressure relief valve 26 and can be funded by the pumping unit 14 fuel flow back into the reservoir 12 so that damage to the pumping unit 14 or the line 30 is avoided. The pressure relief valve 26 may be set, for example, to an opening pressure between about 6 and 8 bar.
  • The delivery unit 14 is preferably arranged in a storage container 28, which is inserted into the storage container 12 and opposite to the reservoir 12 has a much smaller volume. In the storage tank 28 29 fuel is preferably conveyed from the reservoir 12 by means of a suction jet pump. The reservoir 12 may have a plurality of separate chambers, wherein fuel is conveyed from one or more chambers of the reservoir 12 into the chamber in which the delivery unit 14 is arranged.
  • From the pressure side of the delivery unit 14 leads to the internal combustion engine 10 from a line 30, in which a fuel filter 32 is arranged. Downstream of the fuel filter 32 in the conduit 30, a pressure sensor 34 is arranged, through which the fuel pressure in the conduit 30 downstream of the fuel filter 32 is detected. The pressure sensor 34 is connected to an electronic control device 36, in which the signals of the pressure sensor 34 in the manner explained in more detail below are processed. By the pressure sensor 34 of the actually prevailing in the injection system of the internal combustion engine 10 fuel pressure is detected, which may be 32 lower than the fuel pressure upstream of the fuel filter 32, for example, due to contamination of the fuel filter.
  • By the control device 36, the fuel pressure in the line 30 is evaluated and compared with a predetermined target pressure. The setpoint pressure can be constant or variable depending, for example, on operating parameters of the internal combustion engine. The control device 36 also controls the operation of the electric motor 16 of the delivery unit 14 such that a quantity of fuel is conveyed by the delivery unit 14, which is required to generate in the line 30 downstream of the fuel filter 32 a detected by the pressure sensor 34 fuel pressure, at least approximately is equal to the predetermined target pressure. By the control device 36 is preferably the voltage and / or power supply of the electric motor 16 of the delivery unit 14 clocked, including a clock module 38 is provided. By the clock module 38 can be changed by a variation of the duty cycle of the effective value of the voltage applied to the electric motor 16 voltage and / or the current supplied to the electric motor 16, so that by the delivery unit 14 required to achieve the target pressure delivery rate is provided. The frequency with which the electric motor 16 is operated in a clocked manner is preferably above an audible range of approximately 20 kHz.
  • Downstream of the pressure sensor 34, a valve device 40 is arranged, through which a throttled drain 42 is controlled. The valve device 40 may also be arranged upstream of the pressure sensor 34. The Valve means 40 is a pressure limiting valve that controls the operation depending on the fuel pressure in the conduit 30 downstream of the pressure sensor 34. The valve device 40 is set so that it opens at a fuel pressure in the conduit 30, which is slightly less than the target pressure, which is adjusted via the control device 36 by appropriately controlled operation of the delivery unit 14. The opening pressure of the valve device 40 may be, for example, about 80% to 95% of the target pressure. For example, if the target pressure is about 3 bar, the opening pressure of the valve device 40 may be about 2.8 bar. When the target pressure is variable, the opening pressure of the valve device 40 is set to be slightly below the lowest intended target pressure.
  • When starting the internal combustion engine 10, a large fuel demand is present, but the delivery unit 14 depending on the voltage of the electrical system of the motor vehicle may not yet reached the full capacity. When the fuel pressure in the line 30 has not yet reached the target pressure, the electric motor 16 of the delivery unit 14 is operated by the control device 36 with the full voltage. As long as the fuel pressure is still well below the target pressure, the throttled sequence 42 is kept closed by the valve device 40, so that the entire quantity of fuel delivered by the delivery unit 14 reaches the internal combustion engine. Only when the fuel pressure has reached approximately the predetermined target pressure, the throttled drain 42 is opened by the valve means 40. When the fuel pressure has reached the target pressure during operation of the delivery unit 14, the drain 42 is continuously opened by the valve device 40, so that fuel flows through the drain 42.
  • The throttled drain 42 is designed so that a sufficiently large amount of fuel flows through it. According to the invention, it is provided that the suction jet pump 29 is connected to the outlet 42, so that the amount of fuel flowing through the outlet 42 is the amount of fuel for the suction jet pump 29. The suction jet pump 29 is connected via a line 44 to the outlet 42 and has in known manner a nozzle 45 through which the propulsion jet emerges, and a nozzle 45 downstream opening 46, enters through the additional fuel from the reservoir 12 and in the Storage tank 28 is promoted. The sequence 42 is designed such that the amount of propulsion of the suction jet pump 29 is sufficient to ensure a filling of the storage container 28. Two or more suction jet pumps 29 may also be connected to the outlet 42.
  • By the valve device 40 is also ensured that when the engine 10 and non-operated delivery unit 14, the process is closed, so that in the injection system of the internal combustion engine 10, a sufficient fuel pressure is maintained. In addition, the valve device 40 fulfills a safety function in that the fuel pressure in the injection system of the internal combustion engine 10 is limited, since the process is opened when the opening pressure of the valve device 40 is exceeded. An increase in the fuel pressure can occur, for example, in overrun operation of the internal combustion engine, in which no fuel is consumed, or when the fuel is heated after switching off the internal combustion engine 10.
  • The storage container 28 with the delivery unit 14 arranged therein, the fuel filter 32, the pressure sensor 34, the valve device 40 with the sequence 42 and the clock module 38 are preferably combined to form a structural unit, which is assembled outside of the reservoir 12 and used as a structural unit in the reservoir 12. The assembly may also have a level indicator 48 for the level of the reservoir 12. By this training, the assembly and wiring costs of the components of the assembly is kept low. Moreover, it is advantageous that achieved by the arrangement of the pressure sensor 34 in the assembly with the delivery unit 14, a close coupling of actuator and controlled system, which favors the stability of the scheme.

Claims (5)

  1. Fuel supply device for an internal combustion engine of a motor vehicle having an electromotively driven supply unit (14), by means of which fuel is supplied from a reservoir (12) to an injection system of the internal combustion engine (10), having a throttled outlet (42) arranged downstream of the supply unit (14), which throttled outlet (42) is controlled by means of a valve device (40) as a function of the fuel pressure, the valve device (40) opening the outlet (42) when a fuel pressure which is below a nominal pressure is exceeded, and having a non-return valve (22) integrated into the supply unit (14), characterized in that a pressure sensor (34), by means of which the fuel pressure downstream of the supply unit (14) is detected, and a control device (36), which is connected to the pressure sensor (34), are provided, by means of which the operation of the supply unit (14) is controlled in such a way that the fuel pressure is at least approximately equal to a nominal pressure, the throttled outlet (42) having a constant throttle cross-section and feeding at least one suction jet pump (29).
  2. Fuel supply device according to Claim 1, characterized in that the valve device (40) opens the outlet (42) when a pressure which is approximately 80% to 95% of the nominal pressure is exceeded.
  3. Fuel supply device according to Claim 1 or 2, characterized in that the fuel filter (32) is arranged between the supply unit (14) and the pressure sensor (34), so that the pressure sensor (34) detects the fuel pressure downstream of the fuel filter (32).
  4. Fuel supply device according to one of Claims 1 to 3, characterized in that a pressure limiting valve (26) is integrated into the supply unit (14) upstream of the non-return valve (22).
  5. Fuel supply device according to one of the preceding claims, characterized in that fuel is supplied, by means of the suction jet pump (29), between different chambers of the reservoir (12) and/or from the reservoir (12) into a storage tank (28) from which fuel is sucked by the supply unit (14).
EP00127411A 2000-02-15 2000-12-14 Fuel supply device for an internal combustion engine of a vehicle Expired - Fee Related EP1126157B1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE2000106622 DE10006622A1 (en) 2000-02-15 2000-02-15 Device for supplying a motor vehicle's internal combustion engine with fuel has a feeder unit driven by an electric motor to feed fuel from a reservoir to an internal combustion engine, also pressure-limiting and reverse flow valves.
DE10006622 2000-02-15

Publications (3)

Publication Number Publication Date
EP1126157A2 EP1126157A2 (en) 2001-08-22
EP1126157A3 EP1126157A3 (en) 2002-03-20
EP1126157B1 true EP1126157B1 (en) 2006-08-09

Family

ID=7630933

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00127411A Expired - Fee Related EP1126157B1 (en) 2000-02-15 2000-12-14 Fuel supply device for an internal combustion engine of a vehicle

Country Status (5)

Country Link
US (1) US6474310B2 (en)
EP (1) EP1126157B1 (en)
JP (1) JP2001254655A (en)
KR (1) KR20010082019A (en)
DE (2) DE10006622A1 (en)

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* Cited by examiner, † Cited by third party
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US6622707B2 (en) 2000-06-28 2003-09-23 Delphi Technologies, Inc. Electronic returnless fuel system
US6532941B2 (en) * 2000-08-29 2003-03-18 Delphi Technologies, Inc. Electronic returnless fuel system
US7318414B2 (en) * 2002-05-10 2008-01-15 Tmc Company Constant-speed multi-pressure fuel injection system for improved dynamic range in internal combustion engine
US6705298B2 (en) * 2002-05-20 2004-03-16 Denso International America, Inc. Fuel pump module
DE50305995D1 (en) * 2002-12-07 2007-01-25 Bosch Gmbh Robert REEL-FREE FUEL SUPPLY SYSTEM
DE10329268A1 (en) * 2003-06-30 2005-01-20 Robert Bosch Gmbh Device for conveying fuel from a reservoir to an internal combustion engine
DE102004007878A1 (en) * 2004-02-18 2005-09-15 Ti Automotive (Neuss) Gmbh Fuel supply system and method for controlling the fuel supply
US7168414B2 (en) * 2004-09-03 2007-01-30 Federal Mogul World Wide, Inc. Marine vapor separator with bypass line
DE102004049286A1 (en) * 2004-10-09 2006-04-20 Robert Bosch Gmbh Device for conveying fuel
DE102004052439A1 (en) * 2004-10-28 2006-05-04 Siemens Ag Fuel pump and fuel supply system for an internal combustion engine of a motor vehicle with a fuel pump
DE102005003592A1 (en) * 2005-01-26 2006-08-03 Daimlerchrysler Ag Fuel supply device e.g. for supplying internal combustion engine with fuel, has electrically driven fuel pump which delivers fuel from fuel reservoir via fuel filter to internal combustion engine
JP4450211B2 (en) * 2005-01-28 2010-04-14 株式会社デンソー Fuel supply device
JP4670450B2 (en) * 2005-04-15 2011-04-13 トヨタ自動車株式会社 Fuel supply device for internal combustion engine
EP1893864B1 (en) * 2005-06-21 2009-03-11 Daimler AG Fuel supply device
DE102006001878A1 (en) * 2006-01-13 2007-07-19 Siemens Ag Fuel conveyor
EP2002108B1 (en) 2006-03-29 2011-11-16 Robert Bosch GmbH Fuel system with pressure regulation and pressure relief
DE102006051590A1 (en) * 2006-11-02 2008-05-08 Robert Bosch Gmbh Device for conveying fuel
DE102007028398A1 (en) 2007-06-15 2008-12-24 Ti Automotive (Neuss) Gmbh Fuel pump with electronically commutated motor
US8151767B2 (en) * 2007-08-08 2012-04-10 Ford Global Technologies, Llc Fuel control for direct injection fuel system
US7448361B1 (en) 2007-10-23 2008-11-11 Ford Global Technologies, Llc Direct injection fuel system utilizing water hammer effect
US7966984B2 (en) * 2007-10-26 2011-06-28 Ford Global Technologies, Llc Direct injection fuel system with reservoir
DE102010062121A1 (en) * 2010-11-29 2012-05-31 Robert Bosch Gmbh Device for supplying fuel from fuel tank to combustion engine, comprises suction jet pump, entrainment pipe, which is supplying fluid to suction jet pump, and pressure control valve, which is provided in entrainment pipe
US9097217B2 (en) * 2011-08-31 2015-08-04 Gm Global Technology Operations. Llc Propulsion systems and modules for vehicles
DE102013212267A1 (en) * 2013-06-26 2014-12-31 Robert Bosch Gmbh Fuel delivery system with partial pressure relief valve to drive line of a suction jet pump
SE540028C2 (en) * 2014-07-08 2018-02-27 Scania Cv Ab Combustion engine fuel system, internal combustion engine with such a fuel system, vehicles with such a fuel system and a method for dampening pressure fluctuations of a fuel filter device in a fuel system
US9909468B2 (en) * 2015-08-25 2018-03-06 Caterpillar Inc. Fluid conditioning system with recirculation loop and method for operating same
CN106870224A (en) * 2017-02-07 2017-06-20 无锡开普机械有限公司 Low pressure oil way system used for diesel engine
CN108533427A (en) * 2018-03-22 2018-09-14 安徽江淮汽车集团股份有限公司 A kind of automotive fuel oil system

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Also Published As

Publication number Publication date
EP1126157A3 (en) 2002-03-20
US6474310B2 (en) 2002-11-05
EP1126157A2 (en) 2001-08-22
DE50013301D1 (en) 2006-09-21
KR20010082019A (en) 2001-08-29
US20010018908A1 (en) 2001-09-06
JP2001254655A (en) 2001-09-21
DE10006622A1 (en) 2001-08-16

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