EP1448887B1 - Systeme d'injection pour moteur a combustion interne - Google Patents
Systeme d'injection pour moteur a combustion interne Download PDFInfo
- Publication number
- EP1448887B1 EP1448887B1 EP02803432A EP02803432A EP1448887B1 EP 1448887 B1 EP1448887 B1 EP 1448887B1 EP 02803432 A EP02803432 A EP 02803432A EP 02803432 A EP02803432 A EP 02803432A EP 1448887 B1 EP1448887 B1 EP 1448887B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- fuel
- accumulator
- injection
- pressure
- tank
- 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
Links
- 238000002347 injection Methods 0.000 title claims abstract description 40
- 239000007924 injection Substances 0.000 title claims abstract description 40
- 238000002485 combustion reaction Methods 0.000 title claims description 6
- 239000000446 fuel Substances 0.000 claims abstract description 43
- 238000000034 method Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 238000004904 shortening Methods 0.000 description 2
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 239000002828 fuel tank Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
Images
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
- 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
- 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
- F02M59/447—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 specially adapted to limit fuel delivery or to supply excess of fuel temporarily, e.g. for starting of 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
- F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
- F02M2200/40—Fuel-injection apparatus with fuel accumulators, e.g. a fuel injector having an integrated fuel accumulator
Definitions
- the invention relates to an injection system for internal combustion engine with a common rail fuel injection.
- One of the solutions envisaged by the manufacturers for reducing pollutant emissions means stopping the engine when it is not requested, such as for example Red fire. This technique is more commonly called “stop and start”. Indeed, stopping the engine will allow to lower fuel consumption and therefore reduce polluting discharges. This drop in releases is significant especially in the city where the high concentration of roadways forces to stop regularly and where it forms often plugs.
- Patent Application US5839413 discloses a system which reduces the startup time of a motor to common rail.
- the principle of this system is to make communicate the common rail not only to a pump high pressure but also to a low pressure circuit thanks to two calibrated check valves (a first bass pressure and a second high pressure).
- the low circuit pressure has a low pressure accumulator that allows to maintain a stable pressure lower than that delivered when the high pressure pump is at full load.
- the low pressure circuit already compresses the fuel in the common rail. Then, when the pump high pressure exerts a pressure greater than that prevailing in the low pressure circuit, the low pressure valve, which until then the low pressure flow, will close in favor of the second flap.
- the common rail is finally pressurized only by the high pump pressure.
- the purpose of the present invention is to mitigate all or the disadvantages encountered in the prior art. So, the invention proposes a constitution injection system simple for internal combustion engine allowing shorten the start-up time in order to adapt these engines at the "stop and start”.
- the invention relates to a system injection apparatus for an internal combustion engine comprising least one injection means, feed means of fuel under pressure, a common accumulator at each injection means containing pressurized fuel supplied by said feeding means characterized in that furthermore, between each injection means and said accumulator, a fuel storage device under pressure supplied by said accumulator, said device storer being fit when starting to release said fuel under pressure stored towards its associated injection means in to supply fuel under pressure more quickly than with said supply means alone.
- This system allows to keep the existing structure and adapt it "stop and start “by shortening the startup time.
- each fuel storage device under pressure comprises a first channel which, connecting said accumulator and one of said injection means, has at least one reservoir and at least two means controlled opening located respectively between the accumulator and the reservoir and between the reservoir and said injection means to selectively allow to fill the reservoir of pressurized fuel from said accumulator or to empty the reservoir for supplying said injection means.
- said opening means controlled are solenoid valves.
- Each storage device of fuel under pressure advantageously comprises, in addition to second channel which, in parallel with the first, authorizes only, thanks to a non-return valve, the passage of fuel from said accumulator to said injection means so to allow feeding of the injection means directly by said accumulator. This allows, after the phases of start, that the injection is carried out “normally”, that is to say that each injection means is fed by the same fuel tank under pressure.
- a injection system 1 intended to be used in an internal combustion engine. It consists mainly a high pressure pump 2, a ramp common 3, a storage device 4 and an injector 5. Only one injector 5 is visible but of course, the ramp common 3 may for example feed as much injector 5 than cylinders present in the engine.
- the high pressure pump 2 supplies the common rail 3 in fuel under pressure. This configuration is very used and well known will not be more detailed in this patent.
- the device of storage 4 connects the common rail 3 and the injector 5 by two channels 6, 7 joining before reaching the injector 5.
- the first channel 6 is provided with a non-return valve 8, preventing the flow of fuel from the injector 5 to the common ramp 3 but allowing the reverse flow.
- the second channel 7 comprises a reservoir 9, a sensor of pressure 10 and two solenoid valves 11, 12. In the example illustrated in Figure 1, these last 11, 12, located respectively on the one side and the other side of the tank 9, selectively and independently of each other the opening part of the channel 7.
- the sensor 10 detects the pressure prevailing in the tank 9.
- the sensor 10 When the engine is first started, the reservoir 9 being empty, the sensor 10 indicates that there is no pressure. The solenoid valve 10 is then placed in its open position and the second 11 in its closed position. When the pump is high pressure 2 supplies the common rail 3 with fuel under pressure, fuel will go into channel 6 and channel 7 of each storage device 4 associated with an injector 5.
- the solenoid valve 10 being open, the fuel will then to enter the tank 9 without being able to go further, the solenoid valve 11 being closed.
- the fuel that is in the channel 6 passes through the nonreturn valve 8 and so feeds the injector 5.
- the high pressure pump 2 goes as far as possible the pressure to provide, after a moment, a pressure high enough to reach the minimum pressure of injector operation 5.
- a pressure sensor (no shown) located in each injector 5 allows determine said minimum pressure and then control injection. The engine can then be started.
- the sensor 10 of the storage device 4 of the same way detects if the pressure needed in the tank 9 (which may be much greater than that quoted in previous) is reached.
- the solenoid valve 10 at this time will be placed in its closed position and will therefore imprison fuel under pressure in the tank 9.
- the engine is now ready to operate in "stop and start” mode.
- the solenoid valve 12 When the start command is again actuated and that the sensor 10 detects pressure, the solenoid valve 12 is placed in the open position and release therefore fuel under pressure to its associated injector. indeed, the non-return valve 8 prevents this fuel goes up along the canal 6 towards the common ramp 3.
- the high pressure pump 2 being partially fed in energy from the engine timing belt (no represented), the start of the latter will have an effect accelerator at the pressure rise of the high pump pressure 2. The shortening of the boot will therefore be still multiplied.
- the high pressure pump 2 goes provide a higher pressure in the common rail 3 by compared to that prevailing at the inlet of the injector 5.
- the flap anti-return 8 will then let the fuel flow through from channel 6 to the injector 5.
- the solenoid valve 12 is returned to the closed position and the solenoid valve 11 is reopened.
- the normal fuel injection cycle can then be take place.
- the solenoid valve 11 closes and imprisons new fuel under pressure in the tank 9.
- the restart cycle quoted and repeated several times allows, thanks to this injection system, an engine equipped with a common rail to operate in "stop and start".
- the fact that he there is a storage device 4 for each injector 5 allows a reservoir volume 9 small compared to that of the common rail 3.
- the tank 9 will be sized preferentially so that two injections can be before the high-pressure pump 2 takes the relay.
- channel 7 configurations with a single solenoid valve or a different technology solenoid valves can be considered.
- strategy of the first start-up may be different, for example by filling in the tank 9 only after a few injections.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fuel-Injection Apparatus (AREA)
- Cylinder Crankcases Of Internal Combustion Engines (AREA)
Description
Claims (4)
- Système d'injection (1) pour moteur à combustion interne comprenant au moins un moyen d'injection (5), des moyens d'alimentation de carburant sous pression (2), un accumulateur (3) commun à chaque moyen d'injection (5) contenant du carburant sous pression fourni par lesdits moyens d'alimentation caractérisé en ce qu'il comporte de plus, entre chaque moyen d'injection (5) et ledit accumulateur, un dispositif stockeur de carburant sous pression (4) alimenté par ledit accumulateur, ledit dispositif stockeur étant apte lors du démarrage à libérer ledit carburant sous pression stocké vers son moyen d'injection associé en vue de lui fournir du carburant sous une pression suffisante plus rapidement qu'avec lesdits moyens d'alimentation seuls.
- Système d'injection (1) selon la revendication 1, caractérisé en ce que chaque dispositif stockeur de carburant sous pression (4) comporte un premier canal (7) qui, reliant ledit accumulateur et un desdits moyens d'injection, comporte au moins un réservoir (9) et au moins deux moyens d'ouverture pilotée (11, 12) respectivement situé entre l'accumulateur (3) et le réservoir (9) et entre le réservoir (9) et ledit moyen d'injection pour permettre sélectivement de remplir le réservoir de carburant sous pression (9) venant dudit accumulateur ou de vider le réservoir (9) pour alimenter ledit moyen d'injection.
- Système d'injection (1) selon la revendication 2, caractérisé en ce que lesdits moyens d'ouverture pilotée sont des électrovannes.
- Système d'injection (1) selon la revendication 2 ou 3, caractérisé en ce que chaque dispositif stockeur de carburant sous pression (4) comporte en plus un deuxième canal (6) qui, en parallèle du premier (7), autorise uniquement, grâce à un clapet anti-retour (8), le passage du carburant dudit accumulateur vers ledit moyen d'injection afin de permettre l'alimentation des moyens d'injection (5) directement par ledit accumulateur.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR0114896A FR2832462B1 (fr) | 2001-11-19 | 2001-11-19 | Systeme d'injection pour moteur a combustion interne |
FR0114896 | 2001-11-19 | ||
PCT/FR2002/003806 WO2003044360A1 (fr) | 2001-11-19 | 2002-11-07 | Systeme d'injection pour moteur a combustion interne |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1448887A1 EP1448887A1 (fr) | 2004-08-25 |
EP1448887B1 true EP1448887B1 (fr) | 2005-04-06 |
Family
ID=8869505
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP02803432A Expired - Lifetime EP1448887B1 (fr) | 2001-11-19 | 2002-11-07 | Systeme d'injection pour moteur a combustion interne |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP1448887B1 (fr) |
AT (1) | ATE292755T1 (fr) |
DE (1) | DE60203643T2 (fr) |
FR (1) | FR2832462B1 (fr) |
WO (1) | WO2003044360A1 (fr) |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5787863A (en) * | 1996-01-23 | 1998-08-04 | Caterpillar Inc. | Fuel system having priming actuating fluid accumulator |
US5839413A (en) | 1997-04-28 | 1998-11-24 | The Rexroth Corporation | Quick start HEUI system |
DE19858095C2 (de) * | 1998-12-16 | 2000-10-19 | Siemens Ag | Vorrichtung zur Verbesserung des Startverhaltens von Verbrennungsmotoren mit Speichereinspritzsystemen |
JP2001182639A (ja) * | 1999-12-27 | 2001-07-06 | Toyota Motor Corp | 高圧燃料供給装置 |
US6234128B1 (en) * | 2000-03-13 | 2001-05-22 | General Motors Corporation | Fuel accumulator with pressure on demand |
-
2001
- 2001-11-19 FR FR0114896A patent/FR2832462B1/fr not_active Expired - Fee Related
-
2002
- 2002-11-07 WO PCT/FR2002/003806 patent/WO2003044360A1/fr not_active Application Discontinuation
- 2002-11-07 EP EP02803432A patent/EP1448887B1/fr not_active Expired - Lifetime
- 2002-11-07 AT AT02803432T patent/ATE292755T1/de not_active IP Right Cessation
- 2002-11-07 DE DE60203643T patent/DE60203643T2/de not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
DE60203643T2 (de) | 2006-03-09 |
ATE292755T1 (de) | 2005-04-15 |
FR2832462A1 (fr) | 2003-05-23 |
WO2003044360A1 (fr) | 2003-05-30 |
FR2832462B1 (fr) | 2004-01-02 |
DE60203643D1 (de) | 2005-05-12 |
EP1448887A1 (fr) | 2004-08-25 |
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