EP1226349A1 - Verfahren zum ablassen des kraftstoffdrucks in einem rücklauffreien kraftstoffversorgungssystem - Google Patents
Verfahren zum ablassen des kraftstoffdrucks in einem rücklauffreien kraftstoffversorgungssystemInfo
- Publication number
- EP1226349A1 EP1226349A1 EP00972628A EP00972628A EP1226349A1 EP 1226349 A1 EP1226349 A1 EP 1226349A1 EP 00972628 A EP00972628 A EP 00972628A EP 00972628 A EP00972628 A EP 00972628A EP 1226349 A1 EP1226349 A1 EP 1226349A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- fuel
- pressure
- supply system
- fuel supply
- internal combustion
- 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
- 239000000446 fuel Substances 0.000 title claims abstract description 164
- 238000000034 method Methods 0.000 title claims abstract description 26
- 238000002485 combustion reaction Methods 0.000 claims abstract description 57
- 230000009467 reduction Effects 0.000 claims abstract description 12
- 230000001105 regulatory effect Effects 0.000 claims abstract description 5
- 230000001276 controlling effect Effects 0.000 claims description 2
- 238000002347 injection Methods 0.000 abstract description 20
- 239000007924 injection Substances 0.000 abstract description 20
- 230000006870 function Effects 0.000 description 28
- 230000008439 repair process Effects 0.000 description 16
- 238000012423 maintenance Methods 0.000 description 13
- 239000002828 fuel tank Substances 0.000 description 12
- 239000003502 gasoline Substances 0.000 description 4
- 230000001419 dependent effect Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000008901 benefit Effects 0.000 description 1
- 238000010411 cooking Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
Classifications
-
- 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
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/22—Safety or indicating devices for abnormal conditions
- F02D41/221—Safety or indicating devices for abnormal conditions relating to the failure of actuators or electrically driven elements
-
- 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
- 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
- F02D41/3863—Controlling the fuel pressure by controlling the flow out of the common rail, e.g. using pressure relief valves
- F02D41/3872—Controlling the fuel pressure by controlling the flow out of the common rail, e.g. using pressure relief valves characterised by leakage flow in injectors
Definitions
- the present invention relates to a method for releasing the fuel pressure in a return-free one
- Fuel supply system of an internal combustion engine to a desired pressure value in which
- Fuel supply system is arranged at least one fuel pump.
- the invention also relates to a control of an internal combustion engine with a return-free
- Fuel supply system in which at least one
- Fuel pump is arranged.
- fuel is pumped from a fuel tank from a fuel pump via a pressure line to a fuel distributor with injection valves located on the internal combustion engine.
- a return line branches off from the fuel distributor and leads back into the fuel tank.
- the amount of fuel that is not required for the internal combustion engine flows through the fuel distributor and back into the fuel tank via the return line. This leads to an increase in the fuel temperature in the fuel tank during operation of the internal combustion engine.
- a high-pressure fuel accumulator is provided as a fuel distributor. From the fuel tank, fuel is first fed to a downstream high-pressure feed pump by a pre-feed pump designed as an electric fuel pump. The high-pressure feed pump delivers the fuel at a very high pressure into the high-pressure fuel reservoir, from where it leads to the
- Injectors trained injectors arrives.
- direct-injection diesel engines are operated with fuel pressures of up to 1,500 bar and direct-injection gasoline engines with fuel pressures of 50 to 100 bar.
- Pressure must be used for maintenance and repairs can be reduced to a lower pressure value.
- An unpressurized high-pressure fuel reservoir may even be necessary.
- Fuel supply system of an internal combustion engine if required, as quickly as possible and without being able to lower the pressure relief valves to a desired pressure value.
- the invention proposes, starting from the method for lowering the fuel pressure of the type mentioned at the outset, that the fuel supply system and the internal combustion engine are operated in a pressure-reducing operation in which at least one fuel pump of the internal combustion engine is controlled or regulated in such a way that the desired pressure value is set in the fuel supply system.
- the fuel pressure is reduced via the injection valves.
- the fuel supply system and the internal combustion engine are operated in a pressure reduction mode.
- At least one fuel pump of the fuel supply system is activated in such a way that the desired pressure value is set in the fuel supply system.
- Fuel supply system in particular in the fuel rail the desired pressure value.
- the method according to the invention has the advantage that the fuel pressure in a return-free fuel supply system can be quickly reduced to a desired pressure value without the use of additional pressure relief valves.
- return-free high-pressure fuel supply systems have demand-controlled pressure control.
- the pressure control in the pressure reduction mode can be controlled in such a way that the desired pressure value is set in the fuel supply system.
- the internal combustion engine is operated, for example, in idle mode or in another operating state.
- the operating state of the internal combustion engine depends on the type of maintenance or repair cycle that is to be carried out during the pressure reduction operation.
- the at least one fuel pump delivers fuel from the fuel tank with the desired pressure value into the fuel supply system.
- the fuel pressure in the fuel supply system drops from the operating pressure to the desired pressure value over time.
- Fuel supply system the desired pressure value. However, the fuel pressure can only be reduced to such an extent that it is still sufficient to inject fuel. As soon as the fuel pressure in the fuel supply system becomes too low to inject fuel into the combustion chamber, the internal combustion engine stops.
- the method according to the invention is particularly suitable for use in high-pressure fuel supply systems.
- the prefeed pump is controlled in a targeted manner. Then a lowering of the fuel pressure in the fuel supply system is also a desired one
- the pre-feed pump can be activated until the pre-feed pump is switched off. Then the fuel pressure in the fuel supply system can be reduced to the ambient pressure. The internal combustion engine will run out as soon as sufficient fuel injection is no longer possible due to the low fuel pressure.
- the lowering of the fuel pressure in the fuel supply system to such a low value serves, for example, in workshops to lower the fuel pressure as far as possible in order to enable the high-pressure circuit of the fuel supply system to be opened safely for repair purposes.
- a quantity control valve of the high-pressure feed pump be actuated to control the high-pressure feed pump.
- the pressure control controls the quantity control valve on the high-pressure feed pump in such a way that the desired one Sets pressure in the fuel supply system.
- the pressure reduction operation be controlled by a controller
- the pressure reduction operation is preferably initiated and / or ended by applying one or a sequence of predetermined control commands to the control of the internal combustion engine.
- the control commands represent, for example, a request from a mechanic or another person to go through a selected maintenance or repair cycle with the internal combustion engine and to convert the fuel supply system to the pressure reduction mode for this purpose.
- the fuel supply system and the internal combustion engine can be operated in the pressure-reducing operation.
- the additional function can, for example, be integrated in the control unit software.
- the additional function of the control of the internal combustion engine can be requested and called up by a mechanic or another person.
- the method according to the invention can then run automatically controlled by the control of the internal combustion engine.
- the fuel pump is controlled accordingly.
- the process ends when the pressure release operation is completed.
- the completion of the pressure release operation can in turn be reported to the fault by the mechanic or another person by one or a sequence of predefined control commands.
- FIG. 1 is a flowchart ⁇ in ⁇ s invention
- FIG. 2 shows a flowchart of a method according to the invention in accordance with a second preferred
- the method according to the invention serves to lower the fuel pressure in a return-free fuel supply system of an internal combustion engine to a desired pressure value.
- the method can be carried out during operation of the internal combustion engine in order to adapt the fuel pressure to the respective operating point of the internal combustion engine. Usually, however, the process is carried out by one in a workshop
- the fuel supply system is preferably a common rail storage injection system for a direct injection internal combustion engine, in particular a gasoline engine.
- fuel is made from one
- Fuel tank is conveyed via a high-pressure line to high-pressure accumulator located on the internal combustion engine.
- the fuel from the fuel tank is pumped into a high-pressure fuel reservoir by means of a pre-feed pump, which is preferably designed as an electric fuel pump, and a downstream, demand-controlled high-pressure feed pump. Since it is a return-free fuel supply system, there is no return line from the high-pressure fuel accumulator to the fuel tank, from which
- a functional block 1 in FIG. 1 represents normal operation of the internal combustion engine at operating pressure.
- ⁇ in ⁇ m query block 2 it is checked whether there is a request to lower the fuel pressure. This requirement can be triggered, for example, by a mechanic or another person for maintenance or repair purposes of the internal combustion engine. This request can be carried out, for example, by applying one or a sequence of predetermined control commands to the control of the internal combustion engine. If there is no requirement to lower the fuel pressure, the system branches to function block 1 and normal operation of the internal combustion engine continues.
- the method according to the invention is started in function block 3.
- the desired pressure value is determined, to which the fuel pressure in the fuel supply system is to be lowered starting from the working pressure.
- the desired pressure value can, for example, be controlled by the
- Internal combustion engine can be specified, it can be selected by the person who requested the lowering of the fuel pressure, or it is determined by the selection of a specific maintenance or repair cycle when the method according to the invention is called up.
- control signals for ⁇ in ⁇ or several fuel pumps of the fuel supply system are determined.
- the control signals are dependent on the desired pressure value determined in function block 4.
- the control signals are determined in such a way that when the internal combustion engine is operating in a pressure-reducing mode (function block 7), after some time the desired
- control signals for the high-pressure delivery pumps of the common rail storage injection system are determined.
- Control signals for the pre-feed pump can also be determined. This is necessary if the fuel pressure in the fuel supply system, in particular in the cooking pressure accumulator, is to be reduced to a value below which the fuel pressure is dependent on the pre-feed pump, for example for repair purposes.
- a function block 6 the pre-feed pump and the high-pressure feed pump of the common rail memory injection system are actuated with the actuation signals determined in function block 5, so that the desired pressure value determined in function block 4 is set in the com-on-rail injection system.
- the internal combustion engine is controlled in a function block 7 such that the selected repair or maintenance cycle can be carried out.
- the internal combustion engine is running in the embodiment operated.
- the fuel supply system and the internal combustion engine are thus operated in the pressure-lowering mode.
- a query block 8 checks whether the selected repair or maintenance cycle has been completed and whether the lowering of the fuel pressure in the fuel supply system can be ended. If the repair or maintenance cycle has not yet been completed, the function blocks 6 and 7 are branched off and the pressure reduction operation is continued. If the selected repair or maintenance cycle has been completed, the method according to the invention is ended in function block 9. Subsequently, the function block 1 is used and the internal combustion engine is operated in normal operation.
- FIG. 2 shows an alternative embodiment of the method according to the invention.
- a setpoint pressure for regulating the fuel pressure prevailing in the high-pressure fuel accumulator is calculated in a function block 10.
- a subsequent query block 11 it is checked whether there is a request to lower the fuel pressure. If there is no request to lower the fuel, the desired pressure calculated in function block 10 is forwarded to the control for the fuel pressure in the high-pressure fuel reservoir in function block 12.
- a further query block 13 checks whether the internal combustion engine is operated in the pressure lowering mode, in particular in idle mode. Will the
- the setpoint pressure in the function block 10 is also passed on to the control of the fuel pressure in the high-pressure fuel accumulator in function block 12.
- the setpoint pressure is set equal to the desired pressure value to which the fuel pressure is to be reduced in the course of the required repair or maintenance cycle.
- the control of the fuel pressure in the high-pressure fuel reservoir in function block 12 then supplies the desired pressure value from function block 14 as the desired pressure.
- the control then triggers the pre-feed pump and the high-pressure feed pump of the fuel supply system accordingly in order to achieve the desired pressure value in the fuel supply system.
- the fuel pressure in the high-pressure fuel reservoir is then regulated in function block 12 to the set pressure from function block 10 (normal operation of the internal combustion engine) or from function block 14 (pressure reduction operation).
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fuel-Injection Apparatus (AREA)
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19951132A DE19951132A1 (de) | 1999-10-23 | 1999-10-23 | Verfahren zum Ablassen des Kraftstoffdrucks in einem rücklauffreien Kraftstoffversorgungssystem |
| DE19951132 | 1999-10-23 | ||
| PCT/DE2000/003562 WO2001031185A1 (de) | 1999-10-23 | 2000-10-11 | Verfahren zum ablassen des kraftstoffdrucks in einem rücklauffreien kraftstoffversorgungssystem |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP1226349A1 true EP1226349A1 (de) | 2002-07-31 |
| EP1226349B1 EP1226349B1 (de) | 2004-12-29 |
Family
ID=7926665
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP00972628A Expired - Lifetime EP1226349B1 (de) | 1999-10-23 | 2000-10-11 | Verfahren zum ablassen des kraftstoffdrucks in einem rücklauffreien kraftstoffversorgungssystem |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US6655360B1 (de) |
| EP (1) | EP1226349B1 (de) |
| JP (1) | JP4465138B2 (de) |
| DE (2) | DE19951132A1 (de) |
| WO (1) | WO2001031185A1 (de) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7275524B2 (en) | 2002-12-07 | 2007-10-02 | Robert Bosch Gmbh | Non-return fuel supply system |
| JP4909973B2 (ja) | 2008-11-14 | 2012-04-04 | 日立オートモティブシステムズ株式会社 | 内燃機関の制御装置 |
| DE102009017472B4 (de) | 2009-04-15 | 2021-08-26 | Bayerische Motoren Werke Aktiengesellschaft | Verfahren zum Absenken des Kraftstoffdrucks in einem rücklauffreien Kraftstoffversorgungssystem |
| EP2333283A1 (de) * | 2009-12-04 | 2011-06-15 | Perkins Engines Company Limited | Verfahren und Vorrichtung zur Steuerung des Drucks in einem Common Rail System |
| FR2976025B1 (fr) * | 2011-06-06 | 2013-06-28 | Peugeot Citroen Automobiles Sa | Procede de decharge de la pression dans une rampe commune d'un moteur thermique a injection directe |
| US10851719B2 (en) | 2014-05-29 | 2020-12-01 | Cummins Power Generation Ip, Inc. | Systems for supplying fuel to fuel-injected engines in gensets |
Family Cites Families (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CH671609A5 (de) * | 1985-06-24 | 1989-09-15 | Mitsui Shipbuilding Eng | Vorrichtung zum verhindern eines uebermaessigen durchflusses von gasfoermigem brennstoff durch eine einspritzduese eines dieselmotors. |
| US4782808A (en) * | 1986-08-13 | 1988-11-08 | Ashland Oil, Inc. | Process and apparatus for reducing port fuel injector deposits |
| US5074272A (en) * | 1986-08-13 | 1991-12-24 | Ashland Oil, Inc. | Process and apparatus for reducing port fuel injector deposits |
| JP3033214B2 (ja) | 1991-02-27 | 2000-04-17 | 株式会社デンソー | 複数の燃料圧送手段による蓄圧式燃料供給方法及び装置と、複数の流体圧送手段を有する機器における異常判断装置 |
| JPH06200857A (ja) * | 1993-01-08 | 1994-07-19 | Fuji Heavy Ind Ltd | 高圧噴射式エンジンの燃料圧力制御方法 |
| JP3133586B2 (ja) * | 1993-11-18 | 2001-02-13 | 富士重工業株式会社 | 高圧燃料噴射式エンジンの燃料圧力制御装置 |
| DE4445586A1 (de) * | 1994-12-20 | 1996-06-27 | Bosch Gmbh Robert | Verfahren zur Reduzierung des Kraftstoffdruckes in einer Kraftstoffeinspritzeinrichtung |
| DE19539883B4 (de) * | 1995-05-26 | 2011-06-01 | Robert Bosch Gmbh | Kraftstoffversorgungsanlage und Verfahren zum Betreiben einer Brennkraftmaschine |
| JPH08338335A (ja) * | 1995-06-09 | 1996-12-24 | Nippondenso Co Ltd | 内燃機関の燃料供給装置 |
| DE19640826B4 (de) * | 1995-10-03 | 2004-11-25 | Nippon Soken, Inc., Nishio | Speicherkraftstoffeinspritzvorrichtung und Druckregelvorrichtung hierfür |
| DE19613184C2 (de) * | 1996-04-02 | 1998-01-22 | Daimler Benz Ag | Verfahren zum Erkennen von Betriebsstörungen in einer Kraftstoffeinspritzanlage |
| DE19632753A1 (de) * | 1996-08-14 | 1998-02-19 | Bosch Gmbh Robert | Vorrichtung und Verfahren zur Kraftstoffzumessung bei einem Kraftfahrzeug |
-
1999
- 1999-10-23 DE DE19951132A patent/DE19951132A1/de not_active Withdrawn
-
2000
- 2000-10-11 EP EP00972628A patent/EP1226349B1/de not_active Expired - Lifetime
- 2000-10-11 DE DE50009140T patent/DE50009140D1/de not_active Expired - Lifetime
- 2000-10-11 WO PCT/DE2000/003562 patent/WO2001031185A1/de not_active Ceased
- 2000-10-11 US US10/111,208 patent/US6655360B1/en not_active Expired - Lifetime
- 2000-10-11 JP JP2001533304A patent/JP4465138B2/ja not_active Expired - Fee Related
Non-Patent Citations (1)
| Title |
|---|
| See references of WO0131185A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| US6655360B1 (en) | 2003-12-02 |
| JP2003513194A (ja) | 2003-04-08 |
| JP4465138B2 (ja) | 2010-05-19 |
| EP1226349B1 (de) | 2004-12-29 |
| WO2001031185A1 (de) | 2001-05-03 |
| DE50009140D1 (de) | 2005-02-03 |
| DE19951132A1 (de) | 2001-05-10 |
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