EP1117929A1 - Fuel injection system - Google Patents
Fuel injection systemInfo
- Publication number
- EP1117929A1 EP1117929A1 EP99970151A EP99970151A EP1117929A1 EP 1117929 A1 EP1117929 A1 EP 1117929A1 EP 99970151 A EP99970151 A EP 99970151A EP 99970151 A EP99970151 A EP 99970151A EP 1117929 A1 EP1117929 A1 EP 1117929A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- fuel
- injection system
- pump
- filter
- common rail
- 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
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D33/00—Controlling delivery of fuel or combustion-air, not otherwise provided for
- F02D33/003—Controlling the feeding of liquid fuel from storage containers to carburettors or fuel-injection apparatus ; Failure or leakage prevention; Diagnosis or detection of failure; Arrangement of sensors in the fuel system; Electric wiring; Electrostatic discharge
- F02D33/006—Controlling the feeding of liquid fuel from storage containers to carburettors or fuel-injection apparatus ; Failure or leakage prevention; Diagnosis or detection of failure; Arrangement of sensors in the fuel system; Electric wiring; Electrostatic discharge depending on engine operating conditions, e.g. start, stop or ambient conditions
-
- 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
-
- 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
- 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
Definitions
- the invention relates to a fuel injection system for an internal combustion engine according to the preamble of patent claim 1 and a method for controlling an injection system according to the preamble of patent claim 9.
- the fuel is drawn in from a fuel tank via a pre-feed pump and brought up to the pressure required in the common rail of, for example, 1,400 bar via a downstream high-pressure pump.
- the pressure in the common rail is limited by a pressure control valve, via which the excess, pressurized fuel can be returned to the fuel tank.
- the high-pressure pump is designed as a variable displacement pump, different types, for example a suction-restricted pump, a pump driven by an electric motor at different speeds, one Pump with adjustable stroke ring or with adjustable swash plate can be used.
- the pressure control in the common rail is often carried out via a volume flow control valve (suction throttle valve) upstream of the variable displacement pump, while the pressure control valve which limits the pressure in the common rail is only used for rapid pressure reduction.
- a volume flow control valve suction throttle valve
- CFPP classes cold filter plugging point
- electrically heated fuel filters are used in conventional common rail systems, but they are comparatively complex and can only be operated with a considerable amount of energy.
- the invention has for its object a fuel injection system and a method for To create control of an injection system in which the cold start behavior is improved at low temperatures.
- the measure of having a return line opening in the line area between the fuel tank and the fuel filter branch off between the common rail and the high-pressure pump enables a partial fuel flow heated by the action of the high-pressure pump and possibly a suction throttle valve to be returned to the inlet of the filter, so that a The fuel filter is only clogged at significantly lower temperatures than in the prior art. This means that the partial return of a heated amount of fuel to the filter enables the engine to be started well below the CFPP of the fuel used.
- the high-pressure pump is actuated during the cold start in such a way that it delivers a maximum delivery quantity, so that the fuel volume flow returned through the return line is correspondingly maximum.
- the variable displacement pump is practically operated as a constant pump with maximum delivery capacity and heated fuel is essentially introduced directly into the filter.
- the returned fuel can also be fed into the swirl pot of the tank or into another line area between the fuel tank and filter.
- the variable pump is preferably controlled as a function of the fuel temperature measured in the area of the filter. The duration of this cold start control can then be determined either as a function of a predetermined time interval or according to the temperature profile in the filter area.
- the pressure control valve for limiting the pressure in the common rail is arranged in the return line, so that the circuitry complexity is minimized.
- the leakage of the common rail injectors can either be fed into the return line or directly into the fuel tank.
- the return line can be assigned a valve device via which the return line can be connected either to the fuel tank or to the line area between the fuel tank and filter, so that the amount of fuel not required by the common rail is directly in when the engine is warm the fuel tank is returned.
- the single figure shows a hydraulic circuit diagram of a common rail diesel injection system, which is also referred to as an accumulator injection system.
- the common rail system 1 according to the invention has a conventional type of diesel fuel tank 2. This is equipped with a baffle from which the diesel fuel is pumped out.
- the fuel tank 2 is connected to a fuel line 4, through which the diesel fuel can be pumped out of the fuel tank 2 by means of a pre-feed pump 6.
- a fuel filter 8 for example a sieve or paper filter, is provided between the fuel tank 2 and the prefeed pump 6, via which solids, for example dirt or paraffin precipitates, can be removed from the diesel fuel.
- the diesel fuel pressurized via the prefeed pump 6 is led to the suction side of a high-pressure pump 10, which in the exemplary embodiment shown is designed as a variable displacement pump.
- a high-pressure pump 10 which in the exemplary embodiment shown is designed as a variable displacement pump.
- Modern common rail injection systems require maximum pressures of up to 2,000 bar, so that radial piston pumps are preferably used as high pressure pumps.
- the fuel can also be drawn in via a fuel pump which is arranged directly on or in the fuel tank 2 and is, for example, electrically driven. With such a construction, the prefeed pump 6 can be omitted.
- variable pump 10 is not important.
- it can be designed as a suction-throttled pump (similar to the construction in EP 0299337A2) or by an electric motor with different speeds or as a piston pump with an adjustable stroke.
- a volume flow control valve 12 is provided in the fuel line 4.
- adjustable 2/2-way valve is executed.
- the volume flow control valve 12 By correspondingly controlling the volume flow control valve 12, the amount of diesel fuel delivered by the prefeed pump 6 to the suction side of the high-pressure pump 10 is throttled as a function of the load on the engine, so that the optimum delivery amount is always delivered into the common rail 14 arranged downstream of the high-pressure pump 10.
- the volume flow control valve 12 can be brought into a blocking position, so that the fuel supply to the high-pressure pump 10 and thus to the common rail 14 is interrupted.
- the volume flow control valve 12 and / or the variable displacement pump 10 are controlled via a control unit 16, via which injectors 18 of the common rail 14 can also be controlled for fuel injection into the combustion chamber.
- the control of the variable displacement pump 10 or of the volume flow control valve 12 takes place, inter alia, as a function of the fuel temperature, which is detected by a temperature sensor 20. This can be arranged, for example, in the area of the fuel filter 8, so that the diesel fuel temperature is measured when the filter 8 flows through it.
- the aforementioned common rail 14 is connected to the pressure side of the high-pressure pump 10 via a pressure line 22.
- a return line 24 branches off from the pressure line 22 and opens into the fuel line 4 in the area of the inlet of the filter 8.
- a pressure control valve 26 is provided in the return line 24, via which the pressure in the common rail 14 can be limited to a maximum value (for example approximately 1,500 bar).
- the amount of leakage in the injectors 18 and the excess amount of the common rail 14 is indicated by a dashed line. indicated connection line 28 fed into the return line 24 or into a tank line 30.
- a cooling line 32 branches off from the fuel line 4 in the area between the prefeed pump 6 and the high-pressure pump 10 and leads to cooling connections of the high-pressure pump 10. This means that a subset of the diesel fuel supplied by the prefeed pump 6 is used to cool the high-pressure pump 10.
- the diesel fuel partial flow used for cooling is led via a cooling outlet line 34 into the tank line 30 and thus back to the fuel tank 2.
- this partial quantity could also be introduced into the return line 24, since the partial flow emerging from the high-pressure pump 10 and used for cooling has a higher temperature than the diesel fuel in the fuel tank 2, and thus contributes to suppressing the paraffin excretion.
- the volume flow control valve 12 When the engine is cold started, the volume flow control valve 12 is first brought into a flow position, which is selected via the control unit 16 as a function of the operating state of the engine.
- the diesel fuel is sucked out of the fuel tank 2 via the prefeed pump 6 and conveyed through the filter 8 to the suction side of the high-pressure pump 10.
- the fuel temperature in the area of the filter 8 is measured via the temperature sensor 20 and a corresponding signal is supplied to the control unit 16.
- the control unit 16 emits control signals to the volume flow control valve 12 and / or the adjustment device of the high-pressure pump 10.
- the high pressure pump 10 and / or the volume flow control valve til 12 set such that a maximum flow of diesel fuel to the common rail 10 is promoted.
- the relatively large-sized variable displacement pump (high-pressure pump 10) is operated as a constant pump with a maximum delivery rate, so that an excess amount is led to the common rail 14.
- the diesel fuel flowing to the common rail 14 has a substantially higher temperature than the fuel taken directly from the cold fuel tank 2.
- a portion of this heated diesel fuel is returned to the inlet of the filter 8, so that the temperature at the filter 8 rises to a range above the CFPP.
- a paraffin excretion is thus reliably prevented, so that a cold start is also possible below the CFPP.
- a signal is sent to the adjusting pump 10 and / or the volume flow control valve 12 via the control unit 16, so that the delivery quantity to the common rail is reduced and practically only that required diesel fuel volume flow must be compressed by the high pressure pump 10.
- the changeover of the injection system from the cold-run control to the warm-up process can be time-dependent or temperature-dependent.
- the prescribed cold run control is maintained during a predetermined time interval, this time interval being selected such that the warm-up phase is reached even under unfavorable operating conditions.
- the cold run Control as a function of the filter temperature that is to say the "normal" control of the variable pump 10 takes place only after the filter temperature has exceeded an upper limit value.
- the return line 24 does not necessarily have to open into the input area of the filter 8, but can be provided practically anywhere between the fuel tank 2 and the filter 8.
- the return line 24 can open into the surge chamber of the fuel tank 2 mentioned at the beginning. It is essential that the returned diesel fuel partial flow only releases its thermal energy to a negligible extent to the other fuel in the fuel tank 2 or to other materials, so that a comparatively high filter temperature is ensured.
- a valve device could also be provided in the return line 24, via which the returning partial flow can optionally be returned to the input area of the filter 8 or directly into the fuel tank 2.
- a fuel injection system for an internal combustion engine and a method for controlling an injection system in which fuel that is not required by a common rail is returned via a return line to a fuel line area between a fuel filter and a fuel tank. This return causes the fuel to be heated so that the filter can be prevented from clogging when the CFPP is undershot.
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 |
---|---|---|---|
DE19845556 | 1998-10-02 | ||
DE19845556A DE19845556A1 (en) | 1998-10-02 | 1998-10-02 | Fuel injection system |
PCT/DE1999/002896 WO2000020754A1 (en) | 1998-10-02 | 1999-09-13 | Fuel injection system |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1117929A1 true EP1117929A1 (en) | 2001-07-25 |
EP1117929B1 EP1117929B1 (en) | 2002-12-11 |
Family
ID=7883276
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP99970151A Expired - Lifetime EP1117929B1 (en) | 1998-10-02 | 1999-09-13 | Fuel injection system |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP1117929B1 (en) |
DE (2) | DE19845556A1 (en) |
WO (1) | WO2000020754A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR100828224B1 (en) * | 2001-01-10 | 2008-05-07 | 로베르트 보쉬 게엠베하 | Fuel-injection system comprising pressure regulation in the return line |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10038560B4 (en) * | 2000-08-03 | 2006-06-29 | Robert Bosch Gmbh | Fuel supply system for an internal combustion engine, in particular of a motor vehicle |
DE10059012A1 (en) * | 2000-11-28 | 2002-06-13 | Bosch Gmbh Robert | Fuel injection system with fuel preheating and fuel-cooled pressure control valve |
DE10253481B4 (en) | 2002-11-13 | 2007-11-15 | Voco Gmbh | Composite material and use of a composite material |
JP2007285235A (en) * | 2006-04-18 | 2007-11-01 | Honda Motor Co Ltd | Fuel supply device for diesel engine |
US7954477B2 (en) | 2006-06-27 | 2011-06-07 | Georg Gruber | Diesel cycle internal combustion engine |
DE102017214123B4 (en) * | 2017-08-14 | 2021-11-25 | Volkswagen Aktiengesellschaft | Method for controlling an injection device for an internal combustion engine |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3710807A1 (en) * | 1987-03-31 | 1988-10-13 | Daimler Benz Ag | LOW-PRESSURE FUEL CIRCUIT WITH FUEL PREHEATING FOR AN AIR COMPRESSING INJECTION COMBUSTION ENGINE |
CH674243A5 (en) * | 1987-07-08 | 1990-05-15 | Dereco Dieselmotoren Forschung | |
DE4013839C1 (en) * | 1990-04-30 | 1991-08-29 | Mercedes-Benz Aktiengesellschaft, 7000 Stuttgart, De | Fuel supply installation for fuel injected diesel engine - has heat exchanger accepting returned fuel and cooperating with flame start installation |
DE4032377A1 (en) * | 1990-10-12 | 1992-04-16 | Daimler Benz Ag | Compression-ignition engine fuel system - has changeover valve in by=pass pipe downstream of lift pump |
DE9421142U1 (en) * | 1994-06-08 | 1995-08-24 | Georgsdorf, Kraft Herbert, 81673 München | Fuel line system for diesel engines, especially for winter operation |
DE4420043C1 (en) * | 1994-06-08 | 1995-09-14 | Kraft Herbert Georgsdorf | Diesel engine fuel injection system |
DE19632753A1 (en) * | 1996-08-14 | 1998-02-19 | Bosch Gmbh Robert | Device and method for metering fuel in a motor vehicle |
-
1998
- 1998-10-02 DE DE19845556A patent/DE19845556A1/en not_active Withdrawn
-
1999
- 1999-09-13 WO PCT/DE1999/002896 patent/WO2000020754A1/en active IP Right Grant
- 1999-09-13 DE DE59903782T patent/DE59903782D1/en not_active Expired - Lifetime
- 1999-09-13 EP EP99970151A patent/EP1117929B1/en not_active Expired - Lifetime
Non-Patent Citations (1)
Title |
---|
See references of WO0020754A1 * |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR100828224B1 (en) * | 2001-01-10 | 2008-05-07 | 로베르트 보쉬 게엠베하 | Fuel-injection system comprising pressure regulation in the return line |
Also Published As
Publication number | Publication date |
---|---|
DE19845556A1 (en) | 2000-04-06 |
DE59903782D1 (en) | 2003-01-23 |
EP1117929B1 (en) | 2002-12-11 |
WO2000020754A1 (en) | 2000-04-13 |
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