EP2534363A1 - Procédé d'alimentation d'une pompe haute pression en carburant dans un système d'injection de carburant d'un moteur à combustion interne et système d'injection de carburant - Google Patents

Procédé d'alimentation d'une pompe haute pression en carburant dans un système d'injection de carburant d'un moteur à combustion interne et système d'injection de carburant

Info

Publication number
EP2534363A1
EP2534363A1 EP11700514A EP11700514A EP2534363A1 EP 2534363 A1 EP2534363 A1 EP 2534363A1 EP 11700514 A EP11700514 A EP 11700514A EP 11700514 A EP11700514 A EP 11700514A EP 2534363 A1 EP2534363 A1 EP 2534363A1
Authority
EP
European Patent Office
Prior art keywords
pressure
fuel
pump
injection system
cooling
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP11700514A
Other languages
German (de)
English (en)
Other versions
EP2534363B1 (fr
Inventor
Christian Langenbach
Marcus Kristen
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
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP2534363A1 publication Critical patent/EP2534363A1/fr
Application granted granted Critical
Publication of EP2534363B1 publication Critical patent/EP2534363B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • F02M63/0001—Fuel-injection apparatus with specially arranged lubricating system, e.g. by fuel oil
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • 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
    • 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
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
    • F04B1/04—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement
    • F04B1/06—Control
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/02—Fuel-injection apparatus having means for reducing wear
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/28—Details of throttles in fuel-injection apparatus
    • 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
    • F04B2205/00—Fluid parameters
    • F04B2205/01—Pressure before the pump inlet
    • 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
    • F04B2205/00—Fluid parameters
    • F04B2205/06—Pressure in a (hydraulic) circuit
    • F04B2205/063—Pressure in a (hydraulic) circuit in a reservoir linked to the pump outlet

Definitions

  • the invention relates to a method for supplying a high-pressure pump in a fuel injection system of an internal combustion engine with fuel, wherein for conveying and for flow control a arranged in a low-pressure circuit electromotive pump is used. Furthermore, the invention relates to a fuel injection system, in particular a common
  • Rail injection system an internal combustion engine
  • the specified device comprises an electromotive-operated feed pump which conveys a certain amount of fuel to a high-pressure pump in accordance with a control unit.
  • the delivery pressure is preset by a throttle arranged on the suction side of the high-pressure pump, which increases or decreases in proportion to the delivery rate.
  • the diameter of the restrictor is determined on the basis of determined test results in accordance with the requirements.
  • Such an electric fuel pump enables on-demand control, by which the power loss is reduced.
  • overrun operation for example, a reduction of the flow rate to zero is possible to lower the high pressure amount to zero.
  • a corresponding control of the feed pump is not possible if at the same time high-pressure fuel pumps are used, which are dependent on a certain minimum fuel supply, for example, for lubrication and / or cooling.
  • the fuel injection system described in EP 1 195 514 A2 has a lubricant line integrated into the low-pressure circuit, by way of which the high-pressure pump is supplied with fuel for lubrication.
  • the supply of fuel for lubrication is, however, to a certain high pressure
  • the object of the invention is to provide a method for supplying a high-pressure pump with fuel, which ensures sufficient for lubrication and / or cooling the fuel supply of the high-pressure pump almost independent of the delivered high pressure , Furthermore, it is intended to specify a fuel injection system which is suitable for carrying out the method and, moreover, has a simple structure and can be operated with low power loss.
  • the method proposed for supplying a high-pressure pump with fuel is inventively characterized in that the fuel pressure a pressure regulating valve arranged on the suction side of the high-pressure pump is regulated, wherein in the closed position of the pressure regulating valve, furthermore, supply of the high-pressure pump with fuel for lubrication and / or cooling via the low-pressure circuit and the delivery pump is ensured.
  • the advantages already mentioned in relation to the use of an electric fuel pump come into play. If the electric fuel pump is used for volume control, for example, a separate metering unit can be dispensed with. The number of electrical / electronic components is thus reduced. Furthermore, it can be dispensed with the arrangement of a pressure control valve on the rail or the high-pressure fuel storage. Because the pressure control is now taken over by the invention according to the invention arranged on the suction side of the high-pressure pump pressure control valve. With a reduction in the number of electrical / electronic components is also accompanied by a reduction of the necessary connections or connectors. Consequently, the structure of a suitable for carrying out the method according to the invention fuel injection system is simplified.
  • the closing of the pressure control valve not only allows a reduction of the delivered high pressure to zero, while in the low pressure area a sufficient amount of fuel for lubrication and / or cooling remains, but also counteracts the spread of pressure pulsations, which occur especially at high speeds and may increase can lead to undesirable high pressure delivery.
  • the method is therefore particularly suitable in
  • the fuel is first supplied to a central pump chamber, from where he sieh distributed to the two shaft bearing points. Excess fuel is fed via lines to a return line.
  • other components can be lubricated and / or cooled.
  • the pressure control valve is designed such that in the closed position of the pressure control valve, the lubrication and / or cooling of the high pressure pump is ensured by the opening pressure of the pressure control valve. Only when the opening pressure is exceeded is the high-pressure pump supplied with fuel for compression. Below the opening pressure results in no Abêtmenge and thus no high pressure amount, but in the low pressure region remains a residual pressure that can be used for lubrication and / or cooling. In this way, a nearly constant lubrication and / or cooling of the high pressure pump is ensured even at low flow rate of the feed pump. If the speed of the electric fuel pump increases, the delivery rate and thus the pressure increases, so that in the sequence opens the pressure control valve and the high-pressure pump fuel is supplied to the compression.
  • the high pressure amount is therefore defined by the characteristic of the pressure control valve.
  • the characteristic and thus the static and / or dynamic behavior of the pressure control valve is selected according to the requirements.
  • a steep characteristic is chosen to cause a small increase in pressure and at the same time a strong piston damping with an increase in the flow rate.
  • the requirements may also justify a different design of the pressure control valve.
  • measures are provided to compensate for leaks in the area of the pressure regulating valve.
  • Such measures can be, for example, the arrangement of a further pressure control valve on the rail or fuel high-pressure accumulator, the use of a zero-feed throttle and / or a corresponding control of the injectors include.
  • a two-stage pump is used
  • the two-stage design is preferably realized by a connection of the pressure control valve to a return. If a part of the flow rate is supplied via the pressure control valve to the return, at the same time increases the requested flow rate. This in turn leads to increased throughput and thus to improved lubrication and / or cooling. Because with the amount of fuel and the lubricating or cooling performance increases.
  • the connection of the pressure control valve to the return is preferably carried out via a throttle. Alternatively or additionally, a throttle connected in parallel with a lubricating and / or cooling line can be used to improve the lubrication and / or cooling. By this measure, the throughput and, consequently, the lubricating and / or cooling capacity is also increased.
  • the difference to a two-stage design of the pressure regulating valve is that an increase in quantity does not presuppose a specific switching position of the pressure regulating valve, but is constant. The proposed measure is therefore suitable in particular for highly stressed pumps.
  • At least one further throttle may be arranged in a lubricating and / or cooling line for limiting the flow.
  • the likewise proposed to solve the problem initially set fuel injection system according to the invention is characterized in that on the suction side of the high-pressure pump, a pressure control valve is provided for controlling the fuel pressure, wherein in the closed position of the pressure control valve for lubricating and / or cooling the high-pressure pump sufficient amount of fuel over the Low pressure circuit and the feed pump is ensured.
  • the distribution of the lubrication and / or cooling distribution preferably takes place. Henen quantity of fuel through a central pump room. From here, the fuel can for example be supplied to the bearing points of a drive shaft received in the pump housing. Alternatively or additionally, separate lubricating and / or cooling lines can be provided for distributing the fuel.
  • the pressure regulating valve is constructed in two stages.
  • the two-stage design can be realized for example by a connection of the pressure control valve to a return, wherein further preferably the connection is via a throttle. By a portion of the flow through the throttle is supplied to the return, the throughput and thus the lubrication and / or cooling capacity can be increased.
  • a throttle may be provided, which is slotted parallel to a lubricating and / or cooling line.
  • a throttle may also be arranged to limit the flow.
  • the specified fuel injection system is suitable for carrying out the method according to the invention described above.
  • the advantages mentioned in connection with the method accordingly apply accordingly to the fuel injection system.
  • Fig. 1 is a schematic representation of a fuel injection system according to a first embodiment of the invention.
  • Fig. 2 is a schematic representation of a fuel injection system according to a second embodiment of the invention.
  • a fuel injection device comprises a piston pump designed as a high-pressure pump 1, which is supplied via a low-pressure circuit 2 with fuel.
  • a high-pressure pump 1 with a pump piston 5 is shown.
  • the high-pressure pump 1 can also be designed as a multi-piston pump.
  • the piston is or are preferably arranged radially around a drive shaft with a cam or eccentric 1 1 and supported on a roller 12 and / or a plunger body on the cam or eccentric 1 1, so that rotation of the drive shaft, a lifting movement of the Koll o bens 10 or the piston causes.
  • the illustrated injection system further comprises an electric motor-driven feed pump 3, which is used in the present case for the delivery of fuel and for controlling the flow rate.
  • a separate metering unit is thus
  • the pressure is controlled by a pressure control valve 5, which on the
  • Suction side of the high-pressure pump 1 is arranged.
  • the intended for compression of fuel passes through the pressure control valve 5 and designed as a check valve inlet valve 13 into a pump working chamber 14 of the high-pressure pump. 1 There, the fuel is released by the lifting movement of the piston 10.
  • High pressure pump 1 no fuel supplied for compression. Nevertheless, sufficient lubrication and / or cooling of the high-pressure pump 1 is ensured via the low-pressure circuit 2 and the electromotive-operated feed pump 3. Because even in the closed position of the pressure control valve 5 passes
  • the illustrated fuel injection system allows the use of a high pressure pump 1, which is dependent on a constant fuel supply, for example, for lubrication and / or cooling of their components. Since such is ensured by the inventive connection of the pressure control valve, the electric motor-driven feed pump 3 can be controlled as needed, ie the subsidized high-pressure amount may be reduced to zero without the high-pressure pump 1 takes damage.
  • Fig. 2 shows another embodiment of a fuel injection system according to the invention.
  • the pressure control valve 5 is constructed in two stages by a connection of the pressure control valve 5 is provided to the return line 17 via a throttle 6. If, in a certain switching position of the pressure regulating valve 5, at least a partial flow of the delivery quantity is supplied via the throttle 6 to the return line 17, the quantity requirement and thus the lubricating and / or cooling capacity increases.
  • a further throttle 6 can be used, which is connected in parallel.

Landscapes

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

Abstract

L'invention concerne un procédé d'alimentation d'une pompe haute pression (1) en carburant dans un système d'injection de carburant d'un moteur à combustion interne, une pompe de refoulement (3) à fonctionnement électromoteur et disposée dans un circuit basse pression (2) étant utilisée pour le refoulement et le réglage de la quantité de refoulement. Ladite pompe permet d'amener, en fonction de la vitesse de rotation du moteur respectivement sélectionnée, une quantité définie de carburant à la pompe haute pression (1) dans laquelle le carburant est tout d'abord comprimé puis amené à un réservoir de carburant haute pression (4). Selon l'invention, le carburant haute pression est régulé sur le côté aspiration de la pompe haute pression (1) au moyen d'une soupape de régulation de pression (5), une alimentation de la pompe haute pression (1) en carburant pour le graissage et/ou le refroidissement étant de surcroît garantie, lorsque la soupape de régulation de pression (5) est en position de fermeture, par l'intermédiaire du circuit basse pression (2) et de la pompe de refoulement (3). L'invention concerne en outre un système d'injection de carburant.
EP11700514.0A 2010-02-11 2011-01-03 Procédé d'alimentation d'une pompe haute pression en carburant dans un système d'injection de carburant d'un moteur à combustion interne et système d'injection de carburant Not-in-force EP2534363B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102010001834A DE102010001834A1 (de) 2010-02-11 2010-02-11 Verfahren zur Versorgung einer Hochdruckpumpe in einem Kraftstoffeinspritzsystem einer Brennkraftmaschine mit Kraftstoff sowie Kraftstoffeinspritzsystem
PCT/EP2011/050017 WO2011098305A1 (fr) 2010-02-11 2011-01-03 Procédé d'alimentation d'une pompe haute pression en carburant dans un système d'injection de carburant d'un moteur à combustion interne et système d'injection de carburant

Publications (2)

Publication Number Publication Date
EP2534363A1 true EP2534363A1 (fr) 2012-12-19
EP2534363B1 EP2534363B1 (fr) 2016-08-10

Family

ID=43707840

Family Applications (1)

Application Number Title Priority Date Filing Date
EP11700514.0A Not-in-force EP2534363B1 (fr) 2010-02-11 2011-01-03 Procédé d'alimentation d'une pompe haute pression en carburant dans un système d'injection de carburant d'un moteur à combustion interne et système d'injection de carburant

Country Status (5)

Country Link
US (1) US9004044B2 (fr)
EP (1) EP2534363B1 (fr)
CN (1) CN102753810B (fr)
DE (1) DE102010001834A1 (fr)
WO (1) WO2011098305A1 (fr)

Cited By (1)

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Publication number Priority date Publication date Assignee Title
EP2999871A4 (fr) * 2013-05-23 2017-01-25 Scania CV AB Procédé et système pour commander un circuit de basse pression

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DE102012203257A1 (de) 2012-03-01 2013-09-05 Bayerische Motoren Werke Aktiengesellschaft Betriebsverfahren für ein Brennkraftmaschinen-Kraftstoffsystem
DE102013210036A1 (de) * 2013-05-29 2014-12-04 Robert Bosch Gmbh Hochdruckpumpe für ein Kraftstoffeinspritzsystem
FR3013395B1 (fr) 2013-11-19 2015-12-11 Renault Sas Procede et systeme d'alimentation en gazole d'un vehicule automobile.
US10161346B2 (en) * 2014-06-09 2018-12-25 Ford Global Technologies, Llc Adjusting pump volume commands for direct injection fuel pumps
US11504927B2 (en) 2018-03-23 2022-11-22 TurnCare, Inc. Systems and methods for controlling and monitoring inflatable perfusion enhancement apparatus for mitigating contact pressure
US11980565B2 (en) 2018-03-23 2024-05-14 TurnCare, Inc. Inflatable perfusion enhancement apparatuses and associated devices, systems and methods
DE102018211173A1 (de) * 2018-07-06 2020-01-09 Robert Bosch Gmbh Verfahren zum Betreiben einer Kraftstofffördereinrichtung für kryogene Kraftstoffe, Kraftstofffördereinrichtung für kryogene Kraftstoffe

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Cited By (2)

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Publication number Priority date Publication date Assignee Title
EP2999871A4 (fr) * 2013-05-23 2017-01-25 Scania CV AB Procédé et système pour commander un circuit de basse pression
US10436143B2 (en) 2013-05-23 2019-10-08 Scania Cv Ab Method for controlling a low pressure circuit by employing future conditions

Also Published As

Publication number Publication date
US20130025569A1 (en) 2013-01-31
CN102753810A (zh) 2012-10-24
WO2011098305A1 (fr) 2011-08-18
CN102753810B (zh) 2016-06-08
US9004044B2 (en) 2015-04-14
EP2534363B1 (fr) 2016-08-10
DE102010001834A1 (de) 2011-08-11

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