EP2271833A1 - Verfahren zum bestimmen eines überdrucks in einem kraftstoffspeicher eines einspritzsystems einer brennkraftmaschine - Google Patents
Verfahren zum bestimmen eines überdrucks in einem kraftstoffspeicher eines einspritzsystems einer brennkraftmaschineInfo
- Publication number
- EP2271833A1 EP2271833A1 EP08874101A EP08874101A EP2271833A1 EP 2271833 A1 EP2271833 A1 EP 2271833A1 EP 08874101 A EP08874101 A EP 08874101A EP 08874101 A EP08874101 A EP 08874101A EP 2271833 A1 EP2271833 A1 EP 2271833A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- pressure
- overpressure
- fuel
- detected
- time
- 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 50
- 238000002347 injection Methods 0.000 title claims abstract description 35
- 239000007924 injection Substances 0.000 title claims abstract description 35
- 238000000034 method Methods 0.000 title claims abstract description 25
- 238000002485 combustion reaction Methods 0.000 title claims abstract description 10
- 238000004590 computer program Methods 0.000 claims description 12
- 238000005259 measurement Methods 0.000 description 6
- 230000007547 defect Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 230000036962 time dependent Effects 0.000 description 4
- 239000002828 fuel tank Substances 0.000 description 3
- 238000001514 detection method Methods 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 239000000969 carrier Substances 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 230000015654 memory Effects 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 239000000243 solution Substances 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D2200/00—Input parameters for engine control
- F02D2200/02—Input parameters for engine control the parameters being related to the engine
- F02D2200/06—Fuel or fuel supply system parameters
- F02D2200/0602—Fuel pressure
-
- 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
- F02M63/023—Means for varying pressure in common rails
Definitions
- the present invention relates to a method for determining an overpressure in a fuel accumulator of an injection system of an internal combustion engine, a corresponding computer program and a corresponding computer program product.
- FIG. 1 shows an injection system 100 for an internal combustion engine on which the present invention is based.
- the injection system 100 comprises a fuel tank 110, from which fuel is conveyed to a metering unit (ZME) 130 by means of an electric fuel pump 120 (EKP).
- the metering unit 130 provides in response to a control signal z of a control unit 180 a certain amount of fuel for a downstream high-pressure pump 140 ready.
- the high pressure pump 140 pumps the fuel into a common rail 150 in which the fuel is stored under high pressure to be available on demand for injection valves (injectors) 160.
- the fuel reservoir 150 is equipped with a pressure sensor 170 (rail pressure sensor, RDS), which is used to determine the pressure in the fuel reservoir.
- the pressure sensor 170 transmits the measured pressure in the fuel accumulator 150 in the form of a measurement signal p to the control unit 180 of the injection system 100.
- the measurement signal can be digital or analog.
- Conventional (rail) pressure sensors deliver a measuring signal at the output, which is proportional to the measured (rail) pressure.
- pressure sensors are used, the one output the maximum measurement signal that corresponds to a pressure value that is approx. 200 bar above the normal operating pressure of an injection system. It is thus not possible for the connected control unit to determine pressures above the maximum outputable pressure value. Thus, the control unit is so far not able to detect overpressures or harmful pressures quickly enough. For this reason, in known injection systems additional elements such as pressure relief valves are used to avoid harmful pressures in the fuel tank
- the high-pressure pump or the fuel accumulator may be equipped with a pressure regulating valve (DRV), which returns an excess flow to the fuel tank.
- DVR pressure regulating valve
- injectors are also used which have no such overpressure functionality or in which leakage takes place only at pressures that are already harmful to the system.
- a pressure limiting valve DBV
- this measure has the disadvantage that the injection system must be equipped with an additional pressure relief valve.
- the invention makes it possible to safely operate an injection system, in particular a common rail system as shown, for example, in FIG. 1, and to detect an overpressure quickly and reliably without having to use, for example, a pressure regulating valve or a pressure limiting valve. It is possible to determine an undesirable overpressure in injection systems which are equipped with a pressure sensor whose maximum signal value which can be output even, in particular, does not yet correspond to any undesired overpressure. In particular, in the method according to the invention, a pressure threshold value is used whose exceeding alone does not represent any overpressure. Thus, pressure sensors can be used which comprise a limited measuring range.
- an overpressure in the fuel accumulator is detected only when the detected pressure exceeds the predetermined pressure threshold within a predetermined first period of time after the derivative of the detected pressure after the time has exceeded the predetermined gradient threshold for the last time.
- the predetermined first time duration can be zero or arbitrarily small.
- an overpressure is detected when the gradient threshold value is exceeded until the pressure threshold value is exceeded.
- a time interval can be provided as harmless for the detection of overpressure.
- an overpressure can also be detected during short-term (corresponding to the first time duration) falling below the gradient threshold value before exceeding the pressure threshold value.
- an overpressure in the fuel accumulator is only detected if the detected pressure exceeds the predetermined pressure threshold value longer than a predetermined second one - A -
- an overpressure in the fuel accumulator is detected only if the derivative of the detected pressure after the time exceeds the predetermined gradient threshold value for longer than a predetermined third period of time.
- the first, second and third time periods can be selected independently of one another, so that an advantageous combination of the time durations can be provided for the respective injection system to be treated.
- An advantageous value for the second time period is, for example, 10 ms.
- the pressure threshold must be exceeded min. 10 ms to determine an overpressure.
- a fuel pump which provides the fuel of a metering unit and / or a high-pressure pump, which pumps the fuel into the fuel storage, are turned off when an overpressure is detected. This can reduce the likelihood of damage to the injection system.
- fuel is discharged from the fuel storage when an overpressure is detected.
- This can preferably be done non-momentarily effective on the injectors, as described in DE 196 36 397 Al. This further reduces the likelihood of damage to the injection system.
- an error count is provided, which is increased, preferably by one, when an overpressure is detected.
- a metering unit is not defective at the first occurrence of overpressure.
- an error count threshold value can be provided, at which point a defect is detected.
- the invention also relates to a control device for a motor vehicle, which is adapted to carry out a method according to the invention.
- the invention also relates to a computer program with program code means which are suitable for carrying out a method according to the invention when the computer program is executed on a computer or a corresponding arithmetic unit, in particular a control unit according to the invention.
- the computer program product provided according to the invention comprises program code means stored on a computer-readable data carrier which are suitable for carrying out a method according to the invention when the computer program is executed on a computer or a corresponding computing unit, in particular a control unit according to the invention.
- Suitable data carriers are, in particular, floppy disks, hard disks, flash memories, EEPROMs, CD-ROMs, DVDs and the like. It is also possible to download a program via computer networks (Internet, intranet, etc.).
- FIG. 1 shows a schematic representation of an injection system for an internal combustion engine.
- FIG. 2 shows schematically a dependence of a measured rail pressure on time.
- FIG. 3 shows schematically a dependence of a rail pressure as well as a low pressure on time.
- FIG. 4 schematically shows a dependence of a rail pressure, a low pressure and an injection quantity on time.
- FIG. 2 schematically shows the course of a measured signal 210 of a measured rail pressure versus time in a diagram 200.
- the measurement signal is as voltage value U in the
- Plot 200 is plotted on a first y-axis 202 versus time t on an x-axis 201.
- a pressure value p is shown, which corresponds to the output
- a sensor can also output a digital measurement signal representing the pressure value.
- the measurement signal 210 of the rail pressure increases over time until it becomes saturated at a time t ⁇ . At time t ⁇ , the maximum signal output value that can be output by means of the exemplary rail pressure sensor is thus reached.
- this measured signal value corresponds to a rail pressure value of approximately 2000 bar.
- overpressure i. in particular a harmful pressure
- a predetermined slope value is shown schematically in the diagram 200 as a straight line 210.
- the signal course 210 (depending on the configuration, either directly or temporally delayed) to exceed the threshold value 210 to exceed a signal threshold value 220.
- a short circuit or other defect of the sensor usually delivers a signal value that is significantly above the maximum signal value that can be output under operating conditions.
- an output value in the case of a sensor defect could be 5 V, for example.
- FIG. 3 shows in a diagram 300 time-dependent pressure profiles 310, 320, 330 and 340.
- the pressure profiles are shown as pressure values p on a y-axis 302 against the time t on an x-axis 301.
- the pressure curve 310 corresponds to a rail pressure curve in the event of a fault in which the metering unit remains in the open state in the case of an adjuster system described above. It can be seen that the rail pressure curve 310 has a value of about 3800 bar for a long time, which usually leads to damage to the injection system.
- Another pressure curve 330 shows the associated pressure curve in the low-pressure region, i. For example, in the area in front of the high-pressure pump 340 according to FIG. 1.
- the rail pressure curve 320 corresponds to a pressure curve, in which the overpressure is detected using the method according to the invention, and then advantageously the electric fuel pump 120 is switched off. It can be seen that the rail pressure profile 320 drops back to a maximum at about 3600 bar and tapers to a value of about 3000 bar. Thus, the probability of damage to the injection system can already be reduced.
- the rail pressure profile 320 is associated with the low-pressure profile 340.
- FIG. 4 shows in a diagram 400 time-dependent pressure profiles 410, 430 as well as a time-dependent injection quantity profile 440.
- the pressure profiles are plotted as pressure values p on a first y-axis 402 against the time t on an x-axis 401.
- the injection quantity course 440 is plotted as an injection quantity m on a second y-axis 403 against the time t on the x-axis 401.
- FIG. 4 shows a rail pressure curve 410 when, as an additional measure, non-momentum-effective injections (emergency injections) are activated. It may be appropriate, instead of a large injection quantity per injector and cycle several small Injecting quantities per injector to control a larger amount of control into the low pressure. These ensure that the rail pressure does not rise above a permissible value when the fuel pump is switched off at the same time. Shutting down the fuel pump serves to limit the amount of fuel needed to reduce the pressure.
- the rail pressure curve 410 is the low-pressure curve 430 associated.
- the rail pressure curve 410 initially has a value of approximately 1850 bar. At a time tl, which is about 0.81 s, an error occurs in the metering unit of the injection system, so that the metering unit remains in an open state. As a result, the rail pressure increases sharply until it exceeds a threshold 420 at a time t ⁇ . Furthermore, the slope of the rail pressure curve between the times tl and t ⁇ is above a predetermined gradient threshold.
- the method used in FIG. 4 is preferably designed so that an overpressure is detected if the predetermined pressure threshold value is exceeded for longer than a predetermined period of time after exceeding the predetermined gradient threshold value. In Figure 4, this period corresponds to the distance t ⁇ -t2 between the times t ⁇ and t2.
- Injection amount course 440 can be seen. It can be seen that the rail pressure can be limited below 2400 bar in comparison with FIG. 3 under the same boundary conditions.
- Exhaust gas recirculation valve EGR valve
- EGR valve Exhaust gas recirculation valve
- the throttle should be closed as far as possible. It should be noted that depending on the operating point of the engine in the air system, a significant negative pressure may occur. When the throttle valve is completely closed, the air intake tract can be destroyed and thus uncontrolled air intake, which is therefore to be avoided.
- a harmful overpressure in an injection system of an internal combustion engine can be detected quickly and, as a consequence, can also be reduced rapidly.
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)
- Combined Controls Of Internal Combustion Engines (AREA)
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102008001444A DE102008001444A1 (de) | 2008-04-29 | 2008-04-29 | Verfahren zum Bestimmen eines Überdrucks in einem Kraftstoffspeicher eines Einspritzsystems einer Brennkraftmaschine |
PCT/EP2008/067912 WO2009132721A1 (de) | 2008-04-29 | 2008-12-18 | Verfahren zum bestimmen eines überdrucks in einem kraftstoffspeicher eines einspritzsystems einer brennkraftmaschine |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2271833A1 true EP2271833A1 (de) | 2011-01-12 |
EP2271833B1 EP2271833B1 (de) | 2011-10-05 |
Family
ID=40511920
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP08874101A Active EP2271833B1 (de) | 2008-04-29 | 2008-12-18 | Verfahren zum bestimmen eines überdrucks in einem kraftstoffspeicher eines einspritzsystems einer brennkraftmaschine |
Country Status (7)
Country | Link |
---|---|
US (1) | US20110166803A1 (de) |
EP (1) | EP2271833B1 (de) |
KR (1) | KR101519181B1 (de) |
CN (1) | CN102016276B (de) |
AT (1) | ATE527441T1 (de) |
DE (1) | DE102008001444A1 (de) |
WO (1) | WO2009132721A1 (de) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102017204827B4 (de) | 2017-03-22 | 2019-08-08 | Continental Automotive Gmbh | Verfahren zur Fehlererfassung bei einem analogen Drucksensor |
DE102018206826A1 (de) * | 2018-05-03 | 2019-11-07 | Robert Bosch Gmbh | Verfahren und Vorrichtung zur Bestimmung des absoluten Drucks und/oder einer Druckänderung in einem Druckbehälter, Druckbehälter |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102010031220A1 (de) * | 2010-07-12 | 2012-01-12 | Robert Bosch Gmbh | Verfahren und Vorrichtung zum Betreiben eines Kraftstoffeinspritzsystems |
GB2517165A (en) * | 2013-08-13 | 2015-02-18 | Gm Global Tech Operations Inc | Method of estimating the injection pressure of an internal combustion engine |
DE102014206717B4 (de) | 2014-04-08 | 2022-10-20 | Vitesco Technologies GmbH | Druckspeichereinrichtung für ein Kraftfahrzeug-Kraftstoff-Einspritzsystem, sowie Verfahren zum Betrieb einer derartigen Druckspeichereinrichtung |
US9657653B2 (en) | 2014-06-09 | 2017-05-23 | Caterpillar Inc. | Gas pressure high and low detection |
FR3087887B1 (fr) * | 2018-10-31 | 2020-10-09 | Safran Aircraft Engines | Dispositif et procede de surveillance de duree de vie d'un equipement hydraulique d'un aeronef |
Family Cites Families (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0585746B1 (de) * | 1992-08-20 | 1999-11-10 | Toyota Jidosha Kabushiki Kaisha | Kraftstoffeinspritzungsregler für Brennkraftmaschine |
DE19513158A1 (de) * | 1995-04-07 | 1996-10-10 | Bosch Gmbh Robert | Einrichtung zur Erkennung eines Lecks in einem Kraftstoffversorgungssystem |
DE59610232D1 (de) | 1995-09-23 | 2003-04-24 | Bosch Gmbh Robert | Verfahren und Vorrichtung zur Steuerung einer Brennkraftmaschine |
DE19626689C1 (de) * | 1996-07-03 | 1997-11-20 | Bosch Gmbh Robert | Verfahren und Vorrichtung zur Überwachung eines Einspritzsystems |
DE19746492A1 (de) * | 1997-10-22 | 1999-04-29 | Bosch Gmbh Robert | Kraftstoffeinspritzanlage für eine Brennkraftmaschine |
US6076504A (en) * | 1998-03-02 | 2000-06-20 | Cummins Engine Company, Inc. | Apparatus for diagnosing failures and fault conditions in a fuel system of an internal combustion engine |
JP3503584B2 (ja) * | 2000-02-14 | 2004-03-08 | トヨタ自動車株式会社 | 燃料蒸気パージシステムの故障診断装置 |
DE10020627A1 (de) * | 2000-04-27 | 2001-11-08 | Bosch Gmbh Robert | Verfahren zum Betreiben eines Kraftstoffversorgungssystems für eine Brennkraftmaschine insbesondere eines Kraftfahrzeugs |
DE10147189A1 (de) * | 2001-09-25 | 2003-04-24 | Bosch Gmbh Robert | Verfahren zum Betreiben eines Kraftstoffversorgungssystems für einen Verbrennungsmotor eines Kraftfahrzeugs |
DE10360332A1 (de) * | 2003-12-20 | 2005-07-21 | Robert Bosch Gmbh | Verfahren und Vorrichtung zum Bestimmen eines Förderintervalls einer Hochdruckpumpe |
DE102004007048A1 (de) * | 2004-02-13 | 2005-09-01 | Robert Bosch Gmbh | Verfahren und Vorrichtung zur Steuerung einer Brennkraftmaschine |
DE102006040441B3 (de) * | 2006-08-29 | 2008-02-21 | Mtu Friedrichshafen Gmbh | Verfahren zum Erkennen des Öffnens eines passiven Druck-Begrenzungsventils |
DE102006053950B4 (de) * | 2006-11-15 | 2008-11-06 | Continental Automotive Gmbh | Verfahren zur Funktionsüberprüfung einer Druckerfassungseinheit eines Einspritzsystems einer Brennkraftmaschine |
-
2008
- 2008-04-29 DE DE102008001444A patent/DE102008001444A1/de not_active Withdrawn
- 2008-12-18 CN CN200880128907.9A patent/CN102016276B/zh active Active
- 2008-12-18 EP EP08874101A patent/EP2271833B1/de active Active
- 2008-12-18 WO PCT/EP2008/067912 patent/WO2009132721A1/de active Application Filing
- 2008-12-18 AT AT08874101T patent/ATE527441T1/de active
- 2008-12-18 US US12/989,908 patent/US20110166803A1/en not_active Abandoned
- 2008-12-18 KR KR1020107024184A patent/KR101519181B1/ko active IP Right Grant
Non-Patent Citations (1)
Title |
---|
See references of WO2009132721A1 * |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102017204827B4 (de) | 2017-03-22 | 2019-08-08 | Continental Automotive Gmbh | Verfahren zur Fehlererfassung bei einem analogen Drucksensor |
DE102018206826A1 (de) * | 2018-05-03 | 2019-11-07 | Robert Bosch Gmbh | Verfahren und Vorrichtung zur Bestimmung des absoluten Drucks und/oder einer Druckänderung in einem Druckbehälter, Druckbehälter |
Also Published As
Publication number | Publication date |
---|---|
DE102008001444A1 (de) | 2009-11-05 |
KR101519181B1 (ko) | 2015-05-11 |
CN102016276A (zh) | 2011-04-13 |
ATE527441T1 (de) | 2011-10-15 |
US20110166803A1 (en) | 2011-07-07 |
EP2271833B1 (de) | 2011-10-05 |
CN102016276B (zh) | 2014-03-12 |
WO2009132721A1 (de) | 2009-11-05 |
KR20110008197A (ko) | 2011-01-26 |
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