EP1133637A1 - Dispositif d'alimentation en carburant d'un moteur a combustion interne, a injection directe - Google Patents
Dispositif d'alimentation en carburant d'un moteur a combustion interne, a injection directeInfo
- Publication number
- EP1133637A1 EP1133637A1 EP99960995A EP99960995A EP1133637A1 EP 1133637 A1 EP1133637 A1 EP 1133637A1 EP 99960995 A EP99960995 A EP 99960995A EP 99960995 A EP99960995 A EP 99960995A EP 1133637 A1 EP1133637 A1 EP 1133637A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- fuel
- pump
- tank
- conduit
- pressure
- 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
- F02M63/02—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
-
- 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
- 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
- F02M55/02—Conduits between injection pumps and injectors, e.g. conduits between pump and common-rail or conduits between common-rail and injectors
- F02M55/025—Common rails
Definitions
- the present invention relates to a fuel supply device for an internal combustion engine with direct injection and more particularly to such a device comprising a ) a fuel tank, b) first means for pumping the fuel contained in said tank, delivering fuel brought to a first pressure level higher than atmospheric pressure, c) second pumping means supplied by said first means and delivering fuel brought to a second pressure level, higher than the first, to at least one injector of said fuel in an engine cylinder and d) means for recycling excess fuel not injected into the engine to said second pumping means and said tank .
- the device shown comprises a fuel tank 1, a pump 2 supplied by the tank 1 and associated with a pressure regulator 3 for delivering fuel to a second pump 5, through a filter 4, the fuel delivered by the pump 2 being brought to a first pressure level higher than atmospheric pressure, but relatively low, hence the name of "low pressure pump” given to the pump 2.
- the second pump 5 still records the fuel pressure, up to a second level, higher than the first, suitable for supplying fuel injectors 6 1 , 6 2 , 6 5 , 6 4 mounted on a ramp 7 for supplying fuel to the cylinders of a combustion engine internal direct injection (not shown).
- Pump 2 is commonly driven by an electric motor powered by the vehicle battery, and pump 5 by the internal combustion engine itself.
- the pressure of the fuel delivered by the pump 5, called “high pressure pump”, is fixed by a regulator
- a sensor 10 delivers to the computer 9 a signal representative of the pressure of the fuel contained in the ramp 7, to allow the computer to regulate the fuel pressure in this ramp to the required predetermined level.
- the computer 9 is commonly constituted by the engine operating management computer, controlling among other things the injectors 6 ⁇ (i from 1 to 4 in the example shown).
- the fuel not delivered by the injectors 6i is returned to the tank to be recycled, through a conduit 11,12, brought to atmospheric pressure.
- a part 12 of this conduit also serves as a leakage conduit for the low pressure pump 2, when the pressure of the fuel which it delivers exceeds the level fixed by the regulator 3, a calibrated valve for example.
- the drawback of such a device is that, in addition to the overall loss of efficiency which results from the following, all of the fuel not delivered to the injectors is returned to the tank, which, taking into account the heating experienced by this fuel during its passage in the ramp 7, leads to a significant generation of fuel vapors in the tank.
- the flow of the high pressure pump is then carried out in a closed circuit with the exception of a supply of fuel from the low pressure pump compensating for the consumption of the injectors.
- This fuel then heats up considerably, and, when the engine stops, generates in particular at the inlet of the high pressure pump a "plug" of vapors.
- the high pressure pump 5 having only a low volumetric efficiency when the internal combustion engine which drives it runs at low speed, it is only when the liquid fuel supplied by the low pressure pump 2 has driven these vapors from the 'entry of the high pressure pump that it can supply the ramp 7 and the injectors 6i with a fuel at suitable high pressure.
- the present invention therefore aims to provide a fuel supply device for an internal combustion engine with direct injection of the type described in the preamble to this description, and which does not have the drawbacks set out above.
- a fuel supply device for an internal combustion engine with direct injection comprising a) a reservoir of fuel, b) first means for pumping the fuel contained in said tank, delivering fuel brought to a first pressure level higher than atmospheric pressure, c) second pumping means supplied by said first means and delivering fuel brought to a second pressure level, higher than the first, at least one injector of said fuel in a cylinder of the engine and, d) means for recycling excess fuel not injected into the engine to said second pumping means and said tank, this device being remarkable in that said recycling means comprise a conduit traversed simultaneously by said excess fuel and the fuel d delivered by said first pumping means and in that a pressure regulator forming part of said first pumping means is placed downstream of said conduit.
- the device according to the present invention combines the respective advantages of the devices of the prior art shown in Figures 1 and 2 of the accompanying drawing, while limiting the drawbacks.
- the conduit traversed simultaneously by the excess fuel and the fuel delivered by the first pumping means terminates on the inlet of a pump forming part of the second pumping means.
- FIGS. 1 and 2 are diagrams of fuel supply devices of the prior art, described in the preamble to this description, and
- FIGS. 3 and 4 are diagrams of first and second embodiments of the device according to one invention, respectively.
- a fuel tank 1 1, first pumping means constituted by a pump 2 and a "low pressure” regulator 3, a filter 4, second pumping means constituted by a pump 5 and a "high pressure” regulator 8, a fuel supply manifold 7 of a plurality of injectors 6i, a conduit 11 for recycling fuel not absorbed by the injectors, a computer 9 controlling the injectors 6 ⁇ and the regulator 8, the computer receiving to do this a signal from a fuel pressure sensor 10.
- the low pressure pump 2 is driven by an electric motor while the high pressure pump 5 is driven by the internal combustion engine with direct injection supplied by the device according to the invention.
- the excess fuel, not absorbed by the injectors 6i is recycled directly into the inlet of the high pressure pump 5 through a conduit 15, through the filter 4, and not returned directly to the tank.
- the low pressure pump 2 itself delivers fresh fuel from the tank into the duct 15 upstream of the filter 4.
- a fuel return pipe to the tank is supplied in parallel with the "high pressure" pump 5.
- this duct 14 starts from the inlet 13 of the pump 5 to return fuel 1 not absorbed by this "high pressure” pump to the tank 1, the regulator 3 "low pressure” being placed in this conduit 14.
- the return duct 14 ′ is “pitted” in the low pressure part of the body of the pump 5.
- the high pressure pump is supplied with a mixture of "hot” fuel coming from the rail 7 supplied with high pressure fuel and "fresh” fuel at low pressure, from tank 1 and this in both the embodiment of FIG. 3 and that of the Figure 4.
- the fuel mixture thus established is delivered to pump 5, at a low pressure adjusted by regulator 3 associated with pump 2.
- the injection of fuel by the pump 2 into the pipe 11 for "leaking" the excess hot fuel coming from the rail 7 causes condensation of the fuel vapors possibly contained in the fuel coming from the rail.
- the high pressure pump 5 is then supplied with a fuel at least largely purged of fuel vapors, which allows rapid priming of this pump when the engine starts, and this whether the latter is hot or cold.
- the fuel contained in the rail 7 or in the duct 11 contains residual fuel vapors which would not have been fully condensed by the fresh fuel injected by the pump 2 in the duct 11, these vapors are evacuated quickly through line 14 at low pressure ( Figure 3) or through line 14 '( Figure 4) to tank 1 at atmospheric pressure.
- the fuel circuit between the rail 7 and the high pressure pump 5, does not contain parts at atmospheric pressure. Upstream of the pump 5, the fuel remains at the low pressure set by the regulator 3, even after the engine has stopped
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 (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR9814975 | 1998-11-27 | ||
FR9814975A FR2786534B1 (fr) | 1998-11-27 | 1998-11-27 | Dispositif d'alimentation en carburant d'un moteur a combustion interne, a injection directe |
PCT/EP1999/009075 WO2000032929A1 (fr) | 1998-11-27 | 1999-11-22 | Dispositif d'alimentation en carburant d'un moteur a combustion interne, a injection directe |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1133637A1 true EP1133637A1 (fr) | 2001-09-19 |
EP1133637B1 EP1133637B1 (fr) | 2002-09-25 |
Family
ID=9533277
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP99960995A Expired - Lifetime EP1133637B1 (fr) | 1998-11-27 | 1999-11-22 | Dispositif d'alimentation en carburant d'un moteur a combustion interne, a injection directe |
Country Status (6)
Country | Link |
---|---|
EP (1) | EP1133637B1 (fr) |
JP (1) | JP2002531753A (fr) |
KR (1) | KR20010080540A (fr) |
DE (1) | DE69903191T2 (fr) |
FR (1) | FR2786534B1 (fr) |
WO (1) | WO2000032929A1 (fr) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10059012A1 (de) * | 2000-11-28 | 2002-06-13 | Bosch Gmbh Robert | Kraftstoffeinspritzsystem mit Kraftstoffvorwärmung und kraftstoffgekühltem Druckregelventil |
DE10205186A1 (de) * | 2002-02-08 | 2003-08-21 | Bosch Gmbh Robert | Kraftstoffeinspritzeinrichtung für eine Brennkraftmaschine |
GB0205965D0 (en) | 2002-03-14 | 2002-04-24 | Delphi Tech Inc | Fuel system |
CN105143094B (zh) * | 2013-03-14 | 2019-06-14 | 德卡产品有限公司 | 产品配制系统 |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19539885A1 (de) * | 1995-05-26 | 1996-11-28 | Bosch Gmbh Robert | Kraftstoffversorgungsanlage und Verfahren zum Betreiben einer Brennkraftmaschine |
JPH09158766A (ja) * | 1995-12-07 | 1997-06-17 | Nissan Motor Co Ltd | 筒内直接噴射式火花点火内燃機関の燃料噴射装置 |
-
1998
- 1998-11-27 FR FR9814975A patent/FR2786534B1/fr not_active Expired - Fee Related
-
1999
- 1999-11-22 KR KR1020017006453A patent/KR20010080540A/ko not_active Application Discontinuation
- 1999-11-22 DE DE69903191T patent/DE69903191T2/de not_active Expired - Fee Related
- 1999-11-22 JP JP2000585546A patent/JP2002531753A/ja active Pending
- 1999-11-22 WO PCT/EP1999/009075 patent/WO2000032929A1/fr not_active Application Discontinuation
- 1999-11-22 EP EP99960995A patent/EP1133637B1/fr not_active Expired - Lifetime
Non-Patent Citations (1)
Title |
---|
See references of WO0032929A1 * |
Also Published As
Publication number | Publication date |
---|---|
FR2786534B1 (fr) | 2000-12-29 |
KR20010080540A (ko) | 2001-08-22 |
FR2786534A1 (fr) | 2000-06-02 |
WO2000032929A1 (fr) | 2000-06-08 |
JP2002531753A (ja) | 2002-09-24 |
EP1133637B1 (fr) | 2002-09-25 |
DE69903191T2 (de) | 2003-02-13 |
DE69903191D1 (de) | 2002-10-31 |
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