EP2640958A1 - Niederdruckkreislauf für ein kraftstoffeinspritzsystem sowie kraftstoffeinspritzsystem - Google Patents
Niederdruckkreislauf für ein kraftstoffeinspritzsystem sowie kraftstoffeinspritzsystemInfo
- Publication number
- EP2640958A1 EP2640958A1 EP11778635.0A EP11778635A EP2640958A1 EP 2640958 A1 EP2640958 A1 EP 2640958A1 EP 11778635 A EP11778635 A EP 11778635A EP 2640958 A1 EP2640958 A1 EP 2640958A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- pressure
- fuel
- pump
- low
- injection system
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
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
- 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
- F02M59/02—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type
- F02M59/04—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type characterised by special arrangement of cylinders with respect to piston-driving shaft, e.g. arranged parallel to that shaft or swash-plate type pumps
- F02M59/06—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type characterised by special arrangement of cylinders with respect to piston-driving shaft, e.g. arranged parallel to that shaft or swash-plate type pumps with cylinders arranged radially to driving shaft, e.g. in V or star arrangement
-
- 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
- F02M59/02—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type
- F02M59/08—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type characterised by two or more pumping elements with conjoint outlet or several pumping elements feeding one engine cylinder
-
- 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
- F02M59/205—Quantity of fuel admitted to pumping elements being metered by an auxiliary metering device
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
- F02M59/20—Varying fuel delivery in quantity or timing
- F02M59/34—Varying fuel delivery in quantity or timing by throttling of passages to pumping elements or of overflow passages, e.g. throttling by means of a pressure-controlled sliding valve having liquid stop or abutment
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- 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
- F02M63/0265—Pumps feeding 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
- F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
- F02M2200/27—Fuel-injection apparatus with filters
Definitions
- the invention relates to a low pressure circuit for a fuel injection system having the features of the preamble of claim 1. Furthermore, the invention relates to a fuel injection system with such a low pressure circuit.
- the fuel injection system described herein comprises a low pressure circuit with a high pressure pump having at least one pump element which is supplied via a differential pressure valve from a suction chamber of the high pressure pump with a first portion of an amount of fuel delivered by a low pressure pump.
- a controllable metering unit is arranged in a fuel path between the differential pressure valve and the low-pressure pump.
- the first part of the quantity of fuel supplied to the suction chamber can be reduced by the supply unit to such an extent that the supplied first part is insufficient to produce a pressure which opens the differential pressure valve, with fuel flowing out of the suction chamber only via at least one pump element. This precludes the use of a zero feed throttle, which serves to dissipate an undesirable leakage flow due to leakage of the
- the distribution of the fuel flow into a flow and a lubricating or cooling flow so that the flow before reaching the suction chamber does not have to be performed on the bearings of the high-pressure pump. This should cause a rapid start of the promotion of the high-pressure pump and thus a quick start of the engine at startup.
- the present invention has the object to provide a simplified and thus low-cost manufacturable low-pressure circuit for a fuel injection system.
- the arrangement of a zero-feed throttle should be dispensed with the arrangement of a zero-feed throttle.
- the proposed low-pressure circuit comprises a fuel tank and a prefeed pump, by means of which fuel from the fuel tank can be sucked and fed via a fuel line of a high-pressure pump.
- the quantity and pressure control takes place via a metering unit arranged outside the high-pressure pump and / or the prefeed pump, which is designed at least in this case as a regulated electric fuel pump, whereby the throttle is connected via a throttle connected in parallel to an inlet of a pump element of the high-pressure pump. or cooling the high-pressure pump is ensured.
- the arrangement of the metering unit outside of the high-pressure pump allows the use of a simple compared to a high-pressure pump with integrated metering unit and inexpensive high-pressure pump. Regardless of the selected pressure control concept, that is, regardless of whether the volume and pressure control via the metering unit and / or a regulated
- Electric fuel pump is carried out, also a structurally identical high-pressure pump can be used. This reduces the manufacturing costs, since the pump design for different flow and pressure control concepts is standardized. Furthermore, the zero feed throttle can be omitted, since in the absence of quantity query by the high pressure pump and / or leakage in the metering unit of the fuel via the parallel throttle of the high-pressure pump for lubrication and / or cooling is supplied. In addition, a simple metering unit with a larger maximum allowable leakage can be used. The maximum permissible leakage is preferably of the order of magnitude of the quantity of fuel required for lubrication and / or cooling of the high-pressure pump. Due to the simple design of the metering unit and the elimination of the zero feed throttle, the low pressure circuit can be further simplified.
- the use of the pre-feed pump for volume and pressure control is based on the principle of the Fuel Pump Control (FPC).
- FPC Fuel Pump Control
- Prerequisite for this is the formation of the prefeed pump as a regulated electric fuel pump and the connection of the feed pump with a control electronics.
- the regulated electric fuel pump can be used as an alternative or in addition to a metering unit for volume and pressure control. If the quantity and pressure control takes place solely via the metering unit, a simple, inexpensive prefeed pump can be selected, for example an impeller pump.
- a return line branches off from the fuel line, which connects the fuel line to the fuel tank. The amount of fuel delivered via the pre-feed pump can then be fed back into the tank via the return line in the absence of metering or lack of quantity inquiry.
- the return line comprises a spring-loaded valve, in particular a check valve or an overflow valve, and / or a throttle.
- the spring-loaded valve ensures that the valve opens and the fuel returns to the tank via the return line only after a specified limit pressure. When using a spill valve this can be easily formed, which in turn has a favorable effect on the cost. If the quantity and pressure control via a regulated electric fuel pump and dispenses with the arrangement of a metering unit, it is sufficient if only a throttle is formed in the return line.
- the spring-loaded valve in particular the overflow valve, is arranged in a housing with the metering unit for forming a fuel control unit (FCU). This allows a compact arrangement of the components of the low-pressure circuit.
- FCU fuel control unit
- the spring-loaded valve is integrated in a filter which is connected upstream of the metering unit or an FCU.
- a low-pressure region of the high-pressure pump is connected via a further return line to the fuel tank.
- the low-pressure region comprises an engine room of the high-pressure pump, so that the amount of fuel flowing out via the return line is guided via the bearings of the high-pressure pump for lubrication and / or cooling thereof.
- the also proposed for solving the problem set fuel injection system for injecting fuel into the combustion chamber of an internal combustion engine further comprises a low pressure circuit according to the invention further high pressure pump for pressurizing the fuel to be injected with high pressure and to promote the high pressure fuel in a high-pressure accumulator and at least one the high-pressure accumulator connected fuel injection valve.
- the high-pressure pump can be designed as a radial piston pump with cam or eccentric drive.
- 1 is a schematic representation of a known fuel injection system with a known low-pressure circuit
- FIG. 2 shows a schematic representation of a first fuel injection system according to the invention
- Fig. 3 is a schematic representation of a second fuel injection system according to the invention.
- Fig. 4 is a schematic representation of a third fuel injection system according to the invention.
- the known fuel injection system shown in FIG. 1 comprises a fuel tank 1 and a prefeed pump 2, which sucks fuel from the tank 1 and supplies via a fuel line 3 to a high-pressure pump 4.
- a metering unit 5 for metering the fuel is integrated in the high-pressure pump 4.
- an overflow valve 18 is arranged in the flow direction in front of the metering unit 5.
- the overflow valve 18 is integrated in the high-pressure pump 4.
- an amount of fuel delivered by the prefeed pump 2 is supplied to a low-pressure region 14 of the high-pressure pump 4 for lubrication and / or cooling, in particular for lubricating and / or cooling the bearings of the high-pressure pump 4.
- a return line with a zero feed throttle 19 which in the absence of quantity query the high-pressure pump 4 the
- the zero-feed throttle 19 thus prevents any leakage quantity of the metering unit 5 from being undesirably conveyed by the high-pressure pump 4 into a high-pressure accumulator 16 connected to the high-pressure pump 4.
- the zero-feed throttle 19 is integrated into the high-pressure pump 4.
- the fuel injection system according to the invention allows the use of a simply constructed high-pressure pump, since the metering unit 5 and the overflow valve 18 - if present - are outsourced.
- the zero-feed throttle 19 can be omitted.
- a high-pressure pump 4 of the same design can be used independently of the respectively selected quantity and pressure control concept.
- the high-pressure pump can be designed, for example, as a radial piston pump with cam or eccentric drive.
- the volume and pressure control via a metering unit 5, which is connected upstream of the high-pressure pump 4 as a fuel control unit 12.
- a filter 13 and a spring-loaded valve 10 designed as a check valve are further arranged.
- the check valve is integrated into the housing of the filter 13, so that the filter 13 and the check valve form a compact unit.
- the check valve connects the fuel line 3 with a return line 9, which directs excess fuel back into the fuel tank 1.
- the metered via the metering unit 5 fuel is divided in front of the high-pressure pump 4 in a flow and a lubricating or cooling flow.
- the lubricating or cooling flow is fed via a throttle 8 to a low-pressure region 14 of the high-pressure pump 4.
- the throttle 8 thus ensures that a certain amount of leakage of the metering unit 5 is not unintentionally promoted via the high pressure pump 4 to high pressure and the high-pressure accumulator 16 is supplied.
- the throttle 8 replaces a zero feed throttle 19 according to the prior art shown in FIG.
- the leakage amount of the metering unit 5 is not supplied to a return, but used for lubrication and / or cooling of the high-pressure pump 4. Since the leakage amount of the metering unit 5 serves to lubricate and / or cool the high-pressure pump 4, some leakage is desired. It can therefore be a simple, that is less dense metering unit 5 are used, which in turn has a favorable effect on the cost.
- the low-pressure region 14 of the high-pressure pump 4 can in turn be connected to the fuel tank 1 via a return line 15.
- the delivery flow is supplied via the inlets 6 and inlet valves 20 used therein to the pump working chambers 21 of the two pump elements 7 of the high-pressure pump 4. There, the fuel is compressed to high pressure and discharged via exhaust valves 22 to a high-pressure accumulator 16. The high-pressure fuel is then injected into the combustion chamber of an internal combustion engine via at least one fuel injection valve 17 connected to the high-pressure accumulator 16.
- FIG. 3 differs from that of FIG. 2 only in that the spring-loaded valve 10 embodied as a check valve is not integrated in the filter 13 but in the fuel control unit 12.
- the metering unit 5 and the valve 10 form a compact unit, which also includes all the essential components for volume and pressure control.
- Such designed fuel control unit 12 can be combined in a simple manner with different pump concepts.
- the embodiment shown in FIG. 4 differs from those of FIGS. 2 and 3 in that the quantity and pressure control is effected via a regulated electric fuel pump used as a prefeed pump 2.
- a metering unit 5 or a fuel control unit 12 can thus be dispensed with.
- the regulated electric fuel pump can be controlled via a control unit (not shown), which ensures demand-based volume and pressure control.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fuel-Injection Apparatus (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE201010043923 DE102010043923A1 (de) | 2010-11-15 | 2010-11-15 | Niederdruckkreislauf für ein Kraftstoffeinspritzsystem sowie Kraftstoffeinspritzsystem |
| PCT/EP2011/069428 WO2012065863A1 (de) | 2010-11-15 | 2011-11-04 | Niederdruckkreislauf für ein kraftstoffeinspritzsystem sowie kraftstoffeinspritzsystem |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP2640958A1 true EP2640958A1 (de) | 2013-09-25 |
| EP2640958B1 EP2640958B1 (de) | 2017-01-11 |
Family
ID=44906157
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP11778635.0A Not-in-force EP2640958B1 (de) | 2010-11-15 | 2011-11-04 | Niederdruckkreislauf für ein kraftstoffeinspritzsystem sowie kraftstoffeinspritzsystem |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP2640958B1 (de) |
| CN (1) | CN103210205B (de) |
| DE (1) | DE102010043923A1 (de) |
| WO (1) | WO2012065863A1 (de) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102012224408A1 (de) | 2012-12-27 | 2014-07-17 | Robert Bosch Gmbh | Kraftstoffeinspritzsystem |
| IN2013CH00451A (de) * | 2013-02-01 | 2015-07-31 | Bosch Ltd | |
| CN105332886B (zh) * | 2014-06-26 | 2020-07-10 | 罗伯特·博世有限公司 | 泵组件 |
| DE102015212121A1 (de) * | 2015-06-30 | 2017-01-05 | Robert Bosch Gmbh | Verfahren zum Ermitteln von Betriebsparametern einer Kraftstoffpumpe |
| CN109386415B (zh) * | 2017-06-16 | 2022-06-03 | 罗伯特·博世有限公司 | 燃料喷射系统 |
| DE102017221293A1 (de) * | 2017-11-28 | 2019-05-29 | Robert Bosch Gmbh | Verfahren zum Betreiben eines Kraftstoffzumesssystems |
| CN108266294A (zh) * | 2017-12-27 | 2018-07-10 | 潍柴动力股份有限公司 | 发动机燃油系统及发动机 |
| CN111219279B (zh) * | 2020-01-08 | 2021-07-09 | 一汽解放汽车有限公司 | 一种具有自保护功能的燃料喷射系统及压力控制方法 |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10146740A1 (de) * | 2001-09-22 | 2003-04-10 | Bosch Gmbh Robert | Kraftstoffeinspritzeinrichtung für eine Brennkraftmaschine |
| EP1321663A3 (de) * | 2001-12-19 | 2003-07-02 | Robert Bosch Gmbh | Kraftstoffeinspritzeinrichtung für eine Brennkraftmaschine |
| JP4450211B2 (ja) * | 2005-01-28 | 2010-04-14 | 株式会社デンソー | 燃料供給装置 |
| ATE467045T1 (de) * | 2006-11-16 | 2010-05-15 | Fiat Ricerche | Verbessertes kraftstoffeinspritzungssystem für einen verbrennungsmotor |
| DE602007004729D1 (de) * | 2007-09-11 | 2010-03-25 | Fiat Ricerche | Kraftstoffeinspritzeinrichtung mit einer Hochdruckkraftstoffpumpe mit variabler Durchflussmenge |
| US7669570B2 (en) * | 2007-09-28 | 2010-03-02 | Gm Global Technology Operations, Inc. | Diesel fuel injection priming system |
| JP2009185623A (ja) * | 2008-02-04 | 2009-08-20 | Nissan Motor Co Ltd | 内燃機関の燃料供給装置 |
-
2010
- 2010-11-15 DE DE201010043923 patent/DE102010043923A1/de not_active Withdrawn
-
2011
- 2011-11-04 WO PCT/EP2011/069428 patent/WO2012065863A1/de not_active Ceased
- 2011-11-04 CN CN201180054553.XA patent/CN103210205B/zh active Active
- 2011-11-04 EP EP11778635.0A patent/EP2640958B1/de not_active Not-in-force
Non-Patent Citations (1)
| Title |
|---|
| See references of WO2012065863A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103210205B (zh) | 2017-02-15 |
| DE102010043923A1 (de) | 2012-05-16 |
| WO2012065863A1 (de) | 2012-05-24 |
| EP2640958B1 (de) | 2017-01-11 |
| CN103210205A (zh) | 2013-07-17 |
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