EP2643582A1 - Verfahren zum betreiben eines kraftstoffsystems einer brennkraftmaschine - Google Patents
Verfahren zum betreiben eines kraftstoffsystems einer brennkraftmaschineInfo
- Publication number
- EP2643582A1 EP2643582A1 EP11758210.6A EP11758210A EP2643582A1 EP 2643582 A1 EP2643582 A1 EP 2643582A1 EP 11758210 A EP11758210 A EP 11758210A EP 2643582 A1 EP2643582 A1 EP 2643582A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- fuel
- operating
- internal combustion
- combustion engine
- 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
- 239000000446 fuel Substances 0.000 title claims abstract description 132
- 238000002485 combustion reaction Methods 0.000 title claims abstract description 32
- 238000000034 method Methods 0.000 title claims abstract description 29
- 230000001105 regulatory effect Effects 0.000 claims description 9
- 238000004590 computer program Methods 0.000 claims description 7
- 238000010438 heat treatment Methods 0.000 claims description 5
- 230000004913 activation Effects 0.000 claims description 4
- 230000006835 compression Effects 0.000 claims description 2
- 238000007906 compression Methods 0.000 claims description 2
- 238000005461 lubrication Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 4
- 230000007704 transition Effects 0.000 description 4
- 239000002828 fuel tank Substances 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000011144 upstream manufacturing Methods 0.000 description 2
- 208000034423 Delivery Diseases 0.000 description 1
- 230000000454 anti-cipatory effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 239000002737 fuel gas Substances 0.000 description 1
- 239000003502 gasoline Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000003860 storage Methods 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
- 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
- F02M59/36—Varying fuel delivery in quantity or timing by variably-timed valves controlling fuel passages to pumping elements or overflow passages
-
- 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
-
- 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
- F02M59/36—Varying fuel delivery in quantity or timing by variably-timed valves controlling fuel passages to pumping elements or overflow passages
- F02M59/366—Valves being actuated electrically
- F02M59/368—Pump inlet valves being closed when actuated
Definitions
- the invention relates to a method according to the preamble of claim 1, and a computer program and a control and / or regulating device according to the independent claims.
- HDP high-pressure piston pump
- Piston pump can be described as follows: If the HDP usually upstream quantity control valve for controlling the amount of fuel supplied for a longer period not driven, so is due to the lack of pressure difference (between a high-pressure delivery chamber to a pre-pressure applied so-called "step room") no
- Piston bush important. Additionally, as a result of the lack of or low pressure, the fuel may be at the comparatively high temperature in the HDP if necessary, evaporate already. Due to the lack of lubrication at the contact points between the piston and the piston bushing, the HDP can be permanently damaged ("piston seizure").
- Particularly critical in this regard may be bivalent propulsion systems in which the internal combustion engine is operated for longer intervals instead of with liquid fuel (gasoline or diesel) with gas (CNG).
- CNG liquid fuel
- HDP high-pressure pump
- hybrid systems can be critical in which the HDP is subjected to similar conditions during electrical operation as in the US Pat
- Can flow fuel pump wherein movable elements of the fuel pump, such as a piston, are lubricated by the flowing fuel. As a result, the fatigue strength of the fuel pump can be increased.
- inventive method alone by a modified control of a valve device of the fuel pump, ie by means
- the invention is based on the consideration that during operation of a
- Combustion chambers of the internal combustion engine is burned and no corresponding
- Fuel is pumped by the fuel pump.
- This can be the case, for example, in so-called “fuel cut-off” phases, or in such internal combustion engines, which are alternatively operated with liquid fuel or with gas, as well as in motor vehicles with hybrid drive.
- a first operating case of the fuel system may be defined, in which a normal delivery of fuel takes place in the pressure range, and a second operating case, in which no fuel is to be conveyed into the pressure range.
- a valve device which measures an amount of fuel supplied to the fuel pump, in the second operating case at least temporarily so controlled that in a first phase of the working movement of the fuel pump fuel from the upstream
- Remaining amount of fuel between movable elements of the fuel pump and the guide or storage is pressed to lubricate this.
- the three phases in particular the transition from the second to the third or the third to the second phase, according to the invention by means of
- a controllable inlet valve is the Valve device opened during the first two phases, and closed during the third phase.
- the third phase begins shortly before reaching the top dead center of the piston and ends with the reaching of the top dead center.
- the three phases can be repeated cyclically with the movement of the piston.
- Valve device takes place in the second operating case periodically with each stroke of the fuel pump.
- This maximum lubrication, for example, the piston can be achieved, whereby the fatigue strength of the fuel pump can be significantly increased.
- a further embodiment of the method provides that the control of the valve device takes place occasionally or periodically in the second operating case, and that no activation takes place in intervening intervals. This can - depending on a specific embodiment of the fuel pump - a sufficient lubrication are made possible, at the same time an unwanted promotion of fuel in the pressure range of the fuel system - and thus a possible exceeding of a limit pressure - is unlikely.
- Pressure range is promoted (zero conveying angle), taking into account at least one operating variable of the internal combustion engine is determined. This can be achieved depending on the at least one operating variable, on the one hand sufficiently lubricated the fuel pump and on the other hand, an unwanted promotion of fuel is avoided.
- the method can be performed more precisely if the zero-feed angle is determined taking into account a plurality of operating variables using at least one characteristic map.
- a large number of operating variables can be used to control the valve device, with further information being available without the additional computational outlay of a control and / or regulating device of the internal combustion engine or of the motor vehicle through the use of one or more characteristic maps. This generally improves the performance of the method, saves computing time and reduces costs.
- the zero-feed angle is determined taking into account at least one of the following variables:
- the first operating case can be distinguished from the second operating case by means of these variables, and thus a "switch-on condition" for the method can be derived.
- these quantities are used to precisely determine the time for the transition from the second to the third phase, so that a sufficient lubrication of the fuel pump can be achieved and at the same time the unwanted promotion of fuel in the pressure range can be prevented.
- the zero-feed angle is changed so far that the rate remains below the limit value. So that can so to speak "anticipatory" the zero conveying angle can be adjusted, so that the security against an unwanted delivery of fuel can be reduced and the probability of exceeding a limit pressure in the pressure range can be minimized.
- the control of the valve device for carrying out the method is further improved if a pressure increase due to heating of the fuel in the pressure range with increasing operating time is taken into account. This makes it easier to distinguish whether the pressure increase has arisen or arises as a result of an unwanted delivery of fuel or as a result of the heating of the fuel. As far as the pressure increase is due to the heating of the fuel, the zero feed angle need not be further reduced, whereby an optimal lubrication of the fuel pump can be maintained.
- Figure 1 is a simplified diagram of a fuel system of a
- FIG. 2 is a schematic of a fuel pump of the fuel system of Figure 1;
- FIG. 3 shows a time diagram with different phases of the working movement of the fuel pump
- FIG. 4 shows a flowchart for a computer program for processing in a control and / or regulating device of the internal combustion engine.
- FIG. 1 shows a fuel system 1 of an internal combustion engine in a greatly simplified schematic representation.
- a fuel tank 9 is connected via a suction line 4, a prefeed pump 5 and a low pressure line 7 with a Fuel pump 3 connected.
- To the fuel pump 3 is via a
- High pressure line 11 a high pressure accumulator 13 ("common rail") connected.
- the high pressure line 1 1 and the high pressure accumulator 13 together form a pressure region 16 of the fuel system 1.
- Electromagnet 15 denotes - is arranged hydraulically in the course of the low-pressure line 7 between the prefeed pump 5 and the fuel pump 3.
- the electromagnet 15 is controlled by a computer program 8 of a control and / or regulating device 19 using maps 6.
- the fuel pump 3 comprises a cam 17 arranged on a drive shaft 10, which can vertically move a piston 18 in the drawing.
- Other elements, such as an exhaust valve of the fuel pump 3, are not shown in FIG.
- the valve device 14 may be formed as a unit with the fuel pump 3.
- the valve device 14 may be designed as a forcibly openable inlet valve of the fuel pump 3 in the sense of a so-called "quantity control valve". During operation of the fuel system 1 promotes the feed pump 5 fuel from
- FIG. 2 shows the fuel pump 3 of Figure 1 in a somewhat more detailed, but also schematic representation.
- the fuel pump 3 has a
- the fuel pump 3 comprises an inlet 28 connected to the low-pressure line 7 with an inlet valve 30, and one with the
- Inlet valve 30 includes a valve spring 31 and a valve body 33.
- the valve body 33 can be moved by means of a horizontally displaceable in the drawing and coupled to the armature 24 valve needle 35. If the electromagnet 15 is energized, the inlet valve 30 can be closed by the force of the valve spring 31. If the electromagnet 15 is not energized, the inlet valve 30 can be forced by the force of the armature spring 26 be opened.
- the piston 18 is arranged vertically movable in the drawing. The piston 18 can be moved by means of a roller 40 of the - in this case elliptical - cam 17 in a cylinder 37.
- the cylinder 37 is formed in a portion of the housing 20.
- Inlet valve 30 is hydraulically connected via an opening 38 with the delivery chamber 36.
- the fuel pump 3 delivers fuel from the inlet 28 to the outlet 32, wherein the outlet valve 34 opens or closes according to a respective pressure difference between the delivery chamber 36 and the outlet 32.
- the inlet valve 30 is at
- FIG. 3 shows a second operating case of the fuel system 1, in which the fuel pump 3 is intended to convey or convey no fuel into the pressure region 16.
- the fuel pump 3 is intended to convey or convey no fuel into the pressure region 16.
- the lower part of the drawing is a time diagram with two
- Time t in the coil 22 flowing current I applied to the ordinate In the upper coordinate system, a stroke 44 of the piston 18 between a bottom dead center UT and a top dead center OT is plotted on the ordinate in the same time scale over the time t.
- a suction phase PH1 a suction phase PH1
- a gearströmphase PH2 a delivery phase PH3
- the funding phase PH3 corresponds to one
- the transition from the remindström phase PH2 in the delivery phase PH3 is too a time t1.
- the sum of the phases PH1 to PH3 shown in FIG. 3 between the two top dead centers OT shown corresponds to a period of the working movement of the piston 18, which in this case corresponds to half a revolution of the cam 17 or the drive shaft 10.
- a hatched area 48 additionally illustrates the delivery phase PH3.
- the suction phase PH1 In the second operating case of the fuel system 1 starts from the left in the drawing top dead center OT, the suction phase PH1.
- the coil 22 of the electromagnet 15 is not energized.
- the inlet valve 30 is opened under pressure control and the outlet valve 34 is closed.
- fuel may flow from the inlet 28 through the opened inlet valve 30 and through
- Opening 38 in the delivery chamber 36 flow.
- the delivery chamber 36 is simultaneously increased.
- the arranged within the housing 20 volumes of the fuel pump 3 are also filled in the second operating case substantially with fuel.
- the suction phase PH1 ends at bottom dead center UT.
- the fuel located in the delivery chamber 36 is at least partially pushed out through the opening 38 and the inlet valve 30 along an arrow 56 and into the low-pressure line 7.
- the remindströmphase PH2 ends at time t1.
- the transition from the remindströmphase PH2 in the subsequent delivery phase PH3 is triggered by the coil 22 is energized.
- the current I has, for example, the course shown in Figure 3 in the lower coordinate system.
- the piston 18 is located shortly before the top dead center OT continues in the upward movement.
- the armature 24 and the valve needle 35 are in the
- the conveyor angle 46 is dimensioned so that the exhaust valve 34 remains closed in all phases PH1 to PH3 and thus just no fuel in the
- Pressure range 16 is conveyed, provided that in the delivery chamber 36 of the pressure prevailing in the pressure chamber 16 hydraulic pressure is not exceeded.
- This conveyor angle 46 is also referred to as "zero conveyor angle" below which no
- Fuel pump 3 can be effected, and on the other hand, an unwanted promotion of fuel in the pressure region 16 can be avoided.
- the zero-feed angle may be based on the angle of the drive shaft 10 of the fuel pump 3.
- control of the electromagnet 15 can be done for example with each stroke 44 of the fuel pump 3.
- the drive may only be occasional or periodic, with no drive at intervening intervals.
- Yet another alternative is to control the valve device 14 over a first limited number of times
- FIG. 4 shows a flowchart for the execution of the method in FIG.
- a query block 72 it is decided in a query block 72 whether there is a switch-on condition for carrying out the method.
- the first operating case is distinguished from the second operating case by means of the above-mentioned operating variables. However, this is not shown in detail in FIG. If the engine is currently in the first operating condition, there is no power-on condition and the program branches back to the start block 70.
- the delivery angle 46 (zero-conveying angle) is determined in a subsequent block 74 from a characteristic diagram 6 and also taking into account the above-mentioned operating variables.
- the electromagnet 15 is actuated in the second operating case and thus the fuel pump 3 is operated in a manner comparable to that shown in FIG.
- a pressure in the pressure region 16 is detected, from which a rate or a gradient of the pressure is determined.
- a possible pressure increase due to heating of the fuel in the pressure region 16 can be taken into account in addition with increasing duration of the second operating case.
- Exhaust valve 34 is thus acted upon more strongly in the closed position. The risk that unintentionally fuel is conveyed into the pressure region 16, thus becomes smaller. Thereafter, the program branches back to the start block 70 and the program continues there.
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 (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102010061810A DE102010061810A1 (de) | 2010-11-23 | 2010-11-23 | Verfahren zum Betreiben eines Kraftstoffsystems einer Brennkraftmaschine |
PCT/EP2011/066416 WO2012069230A1 (de) | 2010-11-23 | 2011-09-21 | Verfahren zum betreiben eines kraftstoffsystems einer brennkraftmaschine |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2643582A1 true EP2643582A1 (de) | 2013-10-02 |
EP2643582B1 EP2643582B1 (de) | 2019-02-27 |
Family
ID=44654122
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP11758210.6A Active EP2643582B1 (de) | 2010-11-23 | 2011-09-21 | Verfahren zum betreiben eines kraftstoffsystems einer brennkraftmaschine |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP2643582B1 (de) |
KR (1) | KR101835301B1 (de) |
CN (1) | CN103221678B (de) |
DE (1) | DE102010061810A1 (de) |
WO (1) | WO2012069230A1 (de) |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2015206266A (ja) * | 2014-04-17 | 2015-11-19 | 株式会社デンソー | 燃料供給制御装置 |
DE102014221674A1 (de) * | 2014-10-24 | 2016-04-28 | Robert Bosch Gmbh | Verfahren zur Ansteuerung eines elektrisch ansteuerbaren Saugventils |
DE102015219153B4 (de) * | 2015-10-05 | 2017-12-21 | Continental Automotive Gmbh | Kraftstoffhochdruckpumpe und Verfahren zur Reduktion von Ungleichförmigkeiten in der Antriebskraft einer Kraftstoffhochdruckpumpe |
EP3346121B1 (de) * | 2017-01-10 | 2019-09-11 | Continental Automotive GmbH | Magnetventil für ein kraftstoffeinspritzsystem und kraftstoffhochdruckpumpe |
DE102018200715A1 (de) * | 2018-01-17 | 2019-07-18 | Robert Bosch Gmbh | Kraftstofffördereinrichtung für kryogene Kraftstoffe |
DE102018211338A1 (de) * | 2018-07-10 | 2020-01-16 | Robert Bosch Gmbh | Kraftstofffördereinrichtung für kryogene Kraftstoffe und Verfahren zum Betreiben einer Kraftstofffördereinrichtung |
Family Cites Families (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19834121A1 (de) | 1998-07-29 | 2000-02-03 | Bosch Gmbh Robert | Kraftstoffversorgungsanlage einer Brennkraftmaschine |
JP4123729B2 (ja) * | 2001-03-15 | 2008-07-23 | 株式会社日立製作所 | 燃料供給装置の制御方法 |
JP2005146882A (ja) | 2003-11-11 | 2005-06-09 | Toyota Motor Corp | 内燃機関の燃料噴射装置 |
DE102004019152B4 (de) * | 2004-04-21 | 2007-05-31 | Robert Bosch Gmbh | Verfahren zum Betreiben eines Magnetventils zur Mengensteuerung |
EP1781917B1 (de) | 2004-06-15 | 2012-11-28 | Toyota Jidosha Kabushiki Kaisha | Steuervorrichtung für ein entlüftungssystem eines zweidüsen-kraftstoffsystems für einen brennkraftmotor |
JP4375164B2 (ja) | 2004-08-23 | 2009-12-02 | トヨタ自動車株式会社 | 内燃機関の点火時期制御方法 |
JP4466340B2 (ja) | 2004-11-18 | 2010-05-26 | トヨタ自動車株式会社 | 燃料供給装置 |
DE102004056665A1 (de) * | 2004-11-24 | 2006-06-01 | Robert Bosch Gmbh | Verfahren, Computerprogramm und Steuer- und/oder Regelgerät zum Betreiben einer Brennkraftmaschien, sowie Brennkraftmaschine |
JP4603867B2 (ja) * | 2004-12-07 | 2010-12-22 | 日立オートモティブシステムズ株式会社 | 可変容量式燃料ポンプの制御装置及び燃料供給システム |
JP4492351B2 (ja) | 2005-01-04 | 2010-06-30 | トヨタ自動車株式会社 | デュアル噴射型内燃機関 |
JP4552694B2 (ja) | 2005-03-02 | 2010-09-29 | トヨタ自動車株式会社 | 車両の燃料供給装置 |
DE102005033638A1 (de) * | 2005-07-19 | 2007-01-25 | Robert Bosch Gmbh | Kraftstoff-Fördereinrichtung, insbesondere für eine Brennkraftmaschine |
JP4455470B2 (ja) * | 2005-10-19 | 2010-04-21 | 日立オートモティブシステムズ株式会社 | 高圧燃料ポンプ、及び高圧燃料ポンプのノーマルクローズ型の電磁弁のコントローラ |
JP4572950B2 (ja) * | 2008-04-10 | 2010-11-04 | 株式会社デンソー | コモンレール圧制御装置およびそれを用いた燃料噴射システム |
US8033268B2 (en) | 2009-01-21 | 2011-10-11 | GM Global Technology Operations LLC | Asynchronous control of high-pressure pump for direct injection engines |
-
2010
- 2010-11-23 DE DE102010061810A patent/DE102010061810A1/de not_active Ceased
-
2011
- 2011-09-21 WO PCT/EP2011/066416 patent/WO2012069230A1/de active Application Filing
- 2011-09-21 KR KR1020137013061A patent/KR101835301B1/ko active IP Right Grant
- 2011-09-21 CN CN201180055747.1A patent/CN103221678B/zh active Active
- 2011-09-21 EP EP11758210.6A patent/EP2643582B1/de active Active
Also Published As
Publication number | Publication date |
---|---|
CN103221678B (zh) | 2016-06-15 |
KR20140004085A (ko) | 2014-01-10 |
EP2643582B1 (de) | 2019-02-27 |
KR101835301B1 (ko) | 2018-03-08 |
CN103221678A (zh) | 2013-07-24 |
WO2012069230A1 (de) | 2012-05-31 |
DE102010061810A1 (de) | 2012-05-24 |
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