EP2630355A1 - Procédé permettant de faire fonctionner un moteur à combustion interne - Google Patents

Procédé permettant de faire fonctionner un moteur à combustion interne

Info

Publication number
EP2630355A1
EP2630355A1 EP11764158.9A EP11764158A EP2630355A1 EP 2630355 A1 EP2630355 A1 EP 2630355A1 EP 11764158 A EP11764158 A EP 11764158A EP 2630355 A1 EP2630355 A1 EP 2630355A1
Authority
EP
European Patent Office
Prior art keywords
time
pressure
pressure value
signal
pressure signal
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.)
Withdrawn
Application number
EP11764158.9A
Other languages
German (de)
English (en)
Inventor
David Vitre
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP2630355A1 publication Critical patent/EP2630355A1/fr
Withdrawn legal-status Critical Current

Links

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
    • 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

Definitions

  • the invention relates to a method for operating an internal combustion engine according to the preamble of claim 1.
  • a metering unit for a high-pressure pump which may have an electrical or mechanical fault.
  • the internal combustion engine is turned off in such an error, whereby no further travel is possible.
  • the method makes it possible despite an error of the metering unit
  • the faulty metering unit is here in
  • High-pressure accumulator is not too high and not too low, but moves within certain limits. Overall, a shutdown of the internal combustion engine is thus prevented due to a faulty metering unit and allows driving on. This increases the availability of the
  • the determined pressure signal falls below a first pressure value at a time.
  • the first pressure value is less than a desired pressure value. This advantageously ensures that the prefeed pump is switched on to prevent too low a pressure.
  • Time duration for the next switching on the feed pump increases when the determined pressure signal does not exceed a second pressure value.
  • the second pressure value is greater than the desired pressure value.
  • Switch-on time of the prefeed pump is advantageously achieved that too low a pressure is prevented and thus injections of fuel can be carried out continuously.
  • Time for the next turn on the feed pump reduced when the detected pressure signal exceeds a third pressure value.
  • the third pressure value is greater than the second pressure value.
  • Time duration for the next switching on the feed pump is not changed when the determined pressure signal exceeds the second pressure value and does not exceed the third pressure value.
  • a further period of time is started at the time and the prefeed pump is switched on at the end of the further period of time.
  • the time duration for the next switching on of the prefeed pump is increased if the ascertained pressure signal o does not rise above the first pressure value within the further time duration.
  • the pre-feed pump is turned on for a longer time and too low pressure is thus additionally counteracted.
  • the further time duration is approximately 5 times a low-point time duration, wherein the low-point time period extends from the time to an expected low point of the determined pressure, and wherein the low-point time period consists of a weighted average value is determined.
  • the further time period is advantageously selected so that it can be detected whether the course of the determined pressure signal behaves as desired and increases or whether the profile of the determined pressure continuously moves in a low range. If the determined pressure is in the low range, it is advantageously possible to counteract and injections can be carried out. 5
  • Figure 1 is a simplified diagram of a fuel injection system of a
  • Figure 2 is a schematic block diagram with a unit for
  • Figures 3a-3d are each a schematic diagram with a time course of a detected pressure signal and a time course of a control signal for the prefeed pump.
  • FIG. 3e shows a schematic diagram for determining a time duration.
  • FIG. 1 shows a fuel injection system 1 of an internal combustion engine in a much simplified representation.
  • a fuel tank 9 is connected via a suction line 4, a prefeed pump 5 and a low-pressure line 7 with a (not explained in detail) high-pressure pump 3.
  • a suction line 4 is connected via a suction line 4, a prefeed pump 5 and a low-pressure line 7 with a (not explained in detail) high-pressure pump 3.
  • the prefeed pump 5 may also be arranged in the fuel tank 9, wherein the suction line 4 is not present accordingly.
  • the prefeed pump 5 can be designed in particular as an electric fuel pump.
  • the prefeed pump 5 is supplied with an actuating signal 26.
  • a high-pressure accumulator 13 (“common rail") is connected via a high-pressure line 1 1.
  • a metering unit 14 - hereinafter referred to as ZME - with an actuating device 15 is arranged hydraulically in the course of the low-pressure line 7 between the prefeed pump 5 and the high-pressure pump 3.
  • Other elements, such as valves of the high-pressure pump 3, are not shown in the figure 1.
  • the ZME 14 may be formed as a unit together with the high-pressure pump 3.
  • an intake valve of the high pressure pump 3 may be forcibly opened by the ZME 14.
  • the prefeed pump 5 promotes fuel from the fuel tank 9 into the low pressure line 7 and the
  • High-pressure pump 3 conveys the fuel into the high-pressure accumulator 13.
  • the ZME 14 determines the quantity of fuel supplied to the high-pressure pump 3.
  • a measurement of the pressure within the high pressure accumulator 13 is made by a pressure sensor 16 to the high pressure accumulator 13.
  • a value measured by this pressure sensor 16 is referred to as a pressure signal 22
  • the ZME 14 is supplied with a control signal 28. About the control signal 28, the opening of the ZME 14 can be influenced.
  • the ZME 14 generates an error signal 24.
  • the error signal 24 can be used to determine whether an error of the ZME 14 exists. On the other hand can be determined by the error signal 24, whether an electrical fault or a mechanical error of the ZME 14 is present.
  • An error of the ZME 14 can also be determined by a combination of further parameters. For example, an electrical fault exists when the ZME 14, e.g. through a disconnected plug, is no longer supplied with energy. In the event of an electrical fault, the ZME 14 usually transitions to an open state, so that fuel is conveyed unhindered from the prefeed pump 5 to the high-pressure pump 3. In the event of a mechanical fault, the ZME 14 may be fully open, fully closed or partially open.
  • Figure 2 shows a schematic block diagram with a unit 20 for
  • the unit 20, the pressure signal 22 and the error signal 24 are supplied. In a manner not shown, other variables, such as a speed of the internal combustion engine, the unit 20 are supplied.
  • the unit 20 generates the control signal 26. In a manner not shown, the unit 20 can also generate the control signal 28.
  • an error of the ZME 14 in particular in the case of a mechanical error, it can be determined via the analysis of the time profile of the pressure signal 22 whether the ZME 14 is sufficiently opened in order to convey fuel to the high-pressure pump 3 by means of the prefeed pump 5. If the increase in pressure in the case of a prefeed pump 5 that is switched on is not steep enough, it is possible to draw conclusions about a closed ZME 14.
  • the unit 20 is part of a control unit, not shown.
  • the control unit, not shown, is part of the internal combustion engine, in particular for a motor vehicle.
  • control signal 26 has two states. In the first state of the actuating signal 26, the prefeed pump 5 is switched on and delivers
  • the actuating signal 26 is formed substantially in response to the pressure signal 22 and the error signal 24.
  • FIG. 3 a shows a schematic diagram 30 a with a time profile of a determined pressure signal 22 a and a time profile of a
  • the pressure signal 22a corresponds to the pressure signal 22 from FIGS. 1 and 2.
  • the control signal 26a corresponds to the control signal 26 from FIGS. 1 and 2.
  • the times t1, t2, t3 are on a time axis t and t4 applied. On a
  • Pressure axis p are plotted a first pressure value pL, a target pressure value pS, a second pressure value pH1 and a third pressure value pH2.
  • the pressure values pL, pH 1 and pH2 are determined as a function of the desired pressure value pS, more precisely with a respective offset to the desired pressure value pS.
  • State axis z has two states z0 and z1 plotted.
  • the state zO corresponds to a switched-off prefeed pump 5 from FIG. 1.
  • the state z1 corresponds to a switched-on prefeed pump 5 from FIG. 1.
  • the pressure signal 22a falls short of the first pressure value pL in a region A at the time t1. After the time t2, the pressure signal 22a changes from a falling course to a rising course. The pressure signal 22a rises above the second pressure value pH1. However, the pressure signal 22a does not exceed the third pressure value pH2. The pressure signal 22a changes into a falling course. The pressure signal 22a falls short of the first pressure value pL in a region B at the time t3. This starts after time t4
  • Pressure signal 22a rise again and exceeds the first pressure value pL.
  • the control signal 26a remains in state z0 until time t1, rises to state z1 at time t1, remains in state z1 until time t2, and returns to state z0 at time t2.
  • the control signal 26a remains in state z0 until time t3, rises to state z1 at time t3, stays in state z1 until time t4, and returns to state z0 at time t4.
  • the determined pressure signal 22a in each case falls short of the first pressure value pL at the times t1 and t3.
  • the undershooting of the first pressure value pL causes the pressure signal 26a to be transferred from the state zO to the state z1. If, therefore, the determined pressure signal 22a drops below the first pressure value pL, the prefeed pump 5 of FIG. 1 is switched on.
  • a time duration d (n + 1) for the next switching on of the prefeed pump 5 of Figure 1 is selected equal to the time duration d (n), since the pressure signal 22a the second pressure value exceeds pH1 after the time t1 and before the time t3 and the pressure signal 22a does not exceed the third pressure value pH2 after the time t1 and before the time t3.
  • the times t1, t2, etc. depend on the course of the pressure signal 22a.
  • the value range of the durations d (n) and d (n + 1) is limited by a minimum value and a maximum value.
  • a cycle usually starts when the pressure value pL is undershot by the pressure signal 22 or here 22a.
  • the cycle n begins with the pressure value pL falling below the pressure signal 22a in the region A at the time t1 and ends with the pressure value pL falling below the pressure signal 22a in the region B at the time t3.
  • the cycle n + 1 starts when the pressure value pL is undershot by the pressure signal 22a in the region B at the time
  • an additional pressure value is provided below the first pressure value pL, wherein the additional pressure value is independent of other pressure values, such as the desired pressure value pS, and is constant. If the pressure signal 22 or 22a drops below this additional pressure value, then regardless of whether the prefeed pump 5 is switched on or off, i. irrespective of the state of the actuating signal 26 or 26a, the prefeed pump 5 is switched on, which corresponds to the state z1 of the actuating signal 26 or 26a. If the pressure signal 22 or 22a exceeds this additional pressure value, the previously deactivated process parts or the previously deactivated process are reactivated.
  • a further pressure value is provided above the first pressure value pL, wherein the further pressure value is independent of the other pressure values, such as the desired pressure value pS, and is constant. If the pressure signal 22 or 22a exceeds the further pressure value, then regardless of whether the prefeed pump 5 is switched on or off, i. regardless of the state of the control signal 26 or 26 a, the
  • Pre-feed pump 5 is turned off, which the state zO of the control signal 26 or
  • FIG. 3b shows a schematic diagram 30b with a time profile of a determined pressure signal 22b and a time profile of a
  • the pressure signal 22b corresponds to the pressure signal 22 of Figures 1 and 2.
  • the control signal 26b corresponds to the control signal 26 of Figures 1 and 2.
  • Times t5, t6, t7, t8 and t9 are plotted on the time axis t.
  • the pressure signal 22b falls below the first pressure value pL in the region A at the time t5.
  • the pressure signal 22b continues to fall to rise again after time t6.
  • the pressure signal 22b reaches a high point between the desired pressure value pS and the second pressure value pH1 and then begins to decrease again to fall below the first pressure value pL in the region B at the time t7.
  • the pressure signal 22b rises again above the first pressure value pL.
  • the actuating signal 26b rises from the state zO to the state z1.
  • the actuating signal 26b lingers in the state z1 and returns to the state z0 at the time t6. Until the time t7, the control signal 26b remains in the state zO and jumps to the state z1 at the time t7. The control signal 26b remains in the state z1 until the time t9 and returns to the state z0 at the time t9.
  • the time period d (n + 1) becomes the next Cycle n + 1 starting from the time duration d (n) from the previous cycle by one
  • the prefeed pump 5 from FIG. 1 can be switched on again at an earlier point in time, such as at time t7, which corresponds to a transition of the actuating signal 26b from the state zO to the state z1. This may be between reaching the high point of the pressure signal 22b and the beginning of the next cycle, i. between times t6 and t7, with the pressure signal 22b decreasing. Trigger for the renewed switching on the feed pump 5, for example, the expiration of a time period explained below, which runs from the time t5 be.
  • FIG. 3 c shows a schematic diagram 30 c with a time profile of a determined pressure signal 22 c and a time profile of a
  • Times t10, t11, t12, t13 and t14 are plotted on the time axis t.
  • the pressure signal 22c falls below the first pressure value pL in the region A at the time t10.
  • the pressure signal 22c begins to rise again after the time t11 and reaches a high point above the third pressure value pH2. Thereafter, the pressure signal 22c drops and falls below the
  • the actuating signal 26c jumps from the state zO to the state z1 at the time t10.
  • the control signal 26c jumps from the state z1 to the state z0.
  • the control signal 26c jumps from the state zO to the state z1.
  • the control signal 26c jumps from the state z1 to the state z0.
  • the time duration d (n + 1) can not be reduced when the pressure signal 22c exceeds the third pressure value pH2 a first time and then falls below again. If the time duration d (n + 1) has not been reduced during this first crossing, the procedure is as described above for a subsequent second exceeding of the third pressure value pH2.
  • the exceeding of the third pressure value pH 2 when the prefeed pump 5 of FIG. 1 is switched on causes the prefeed pump 5 to be switched off.
  • FIG. 3d shows a schematic diagram 30d with a time profile of a determined pressure signal 22d and a time profile of a
  • Times t15, t16, t17, t18, t19, t20, t21, t22, t23, and t24 are plotted on the time axis t.
  • the time t18 is generally referred to as additional time.
  • the pressure signal 22d falls below the first pressure value pL in the region A at the time t15.
  • additional time t18 is the
  • Pressure signal 22d in a range C continues below the first pressure value pL. After the time t19, the pressure signal 22d rises, reaches a high point after the time t21 and before the time t22, and then drops to rise again after the time t24.
  • the control signal 26d rises from the state zO to the state z1 at the time t15. At time t16, the control signal 26d falls back from state z1 to state z0. At the additional time t18, the actuating signal 26d rises from the state zO to the state z1. At time t19, the actuating signal 26d falls back from state z1 to state z0. At the time t22, the actuating signal 26d rises from the state zO to the state z1. At the instant t24, the actuating signal 26d falls back from the state z1 to the state z0.
  • a second time period del2 and a third time duration dell start to run.
  • the second time period del2 is essentially twice the third time duration d1.
  • the determination of the third time duration d1c is explained below with reference to FIG. 3e.
  • Control signal 26d from the state zO in the state z1 transferred i. the prefeed pump 5 is turned on for the period of time d (n), and the time duration d (n + 1) for the next cycle n + 1 to be executed is increased from the time d (n) of the previous cycle n by a period dinc2.
  • the third time period dell and the second time duration del2 start to run with the following subsequent steps above,
  • FIG. 3e shows a schematic diagram 30e for determining the third time duration d. Time points t25, t26, t27 and t28 are plotted on the time axis t.
  • the pressure signal 22e falls short of the first pressure value pL in the region A at the time t25.
  • the pressure signal 22e continues to fall to rise again after time t26.
  • the pressure signal 22e is on a low point and then starts to rise again.
  • the pressure signal 22e reaches a high point between the first pressure value pH2 and the second pressure value pH1 and then begins to decrease again to fall below the first pressure value pL in the region B at the time t27.
  • the pressure signal 22e rises again above the first pressure value pL.
  • the pressure signal 22e is at a low point.
  • a time del1 (n) starts at time t25 and ends at time t26.
  • a time period del1 (n + 1) starts at time t27 and ends at time t28.
  • the first one becomes
  • Determination i. the time duration del1 (n), equated to the third time duration dell
  • the time duration del1 (n + 1) from the following cycle n + 1 is weighted into the third time duration dell.
  • a determined time period del1 (n + z) from a following cycle n + z is weighted into the third time period dell as weighted above.
  • a first determination of the third duration dell can also be carried out by averaging two or more time periods del1 (n), del1 (n + 1), etc.

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

L'invention concerne un procédé permettant de faire fonctionner un moteur à combustion interne. Le carburant est amené à partir d'un réservoir de carburant (9) à un accumulateur haute pression (13) par l'intermédiaire d'une pompe de pré-alimentation (5), d'une unité de dosage (14) et d'une pompe haute pression (3). La pompe de pré-alimentation (5) peut être activée pour le refoulement du carburant. Un signal de pression (22) de la pression régnant dans l'accumulateur haute pression (13) est déterminé. Une erreur de l'unité de dosage (14) est déterminée. L'unité de dosage (14) est sensiblement ouverte. Une durée est déterminée en fonction du signal de pression (22) déterminé. Un moment est déterminé en fonction du signal de pression (22) déterminé. La pompe de pré-alimentation (5) est activée audit moment pour ladite durée.
EP11764158.9A 2010-10-21 2011-09-28 Procédé permettant de faire fonctionner un moteur à combustion interne Withdrawn EP2630355A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE102010042732 2010-10-21
DE102011005592.4A DE102011005592B4 (de) 2010-10-21 2011-03-16 Verfahren zum Betreiben einer Brennkraftmaschine
PCT/EP2011/066857 WO2012052264A1 (fr) 2010-10-21 2011-09-28 Procédé permettant de faire fonctionner un moteur à combustion interne

Publications (1)

Publication Number Publication Date
EP2630355A1 true EP2630355A1 (fr) 2013-08-28

Family

ID=45923301

Family Applications (1)

Application Number Title Priority Date Filing Date
EP11764158.9A Withdrawn EP2630355A1 (fr) 2010-10-21 2011-09-28 Procédé permettant de faire fonctionner un moteur à combustion interne

Country Status (4)

Country Link
EP (1) EP2630355A1 (fr)
CN (1) CN103201486B (fr)
DE (1) DE102011005592B4 (fr)
WO (1) WO2012052264A1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105781770A (zh) * 2015-01-12 2016-07-20 罗伯特·博世有限公司 用于燃料喷射系统的燃料计量单元及其操作方法
DE102016200716A1 (de) * 2016-01-20 2017-07-20 Robert Bosch Gmbh Verfahren und Vorrichtung zur Steuerung eines Kraftstoffzumesssystems einer Brennkraftmaschine
DE102016200715A1 (de) * 2016-01-20 2017-07-20 Robert Bosch Gmbh Verfahren und Vorrichtung zur Steuerung eines Kraftstoffzumesssystems einer Brennkraftmaschine
DE102017210065A1 (de) 2017-06-14 2018-12-20 Robert Bosch Gmbh Verfahren zum Betreiben einer Förderpumpe eines Kraftstoffzumesssystems

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Publication number Priority date Publication date Assignee Title
DE19548280A1 (de) * 1995-12-22 1997-06-26 Bosch Gmbh Robert Verfahren und Vorrichtung zur Steuerung einer Brennkraftmaschine
DE19757655C2 (de) * 1997-12-23 2002-09-26 Siemens Ag Verfahren und Vorrichtung zur Funktionsüberwachung eines Drucksensors
JP2005344573A (ja) * 2004-06-01 2005-12-15 Denso Corp 内燃機関用燃料噴射装置
CN2895762Y (zh) * 2006-04-25 2007-05-02 中国船舶重工集团公司第七一一研究所 柴油机燃油喷射系统
US7395814B1 (en) * 2006-09-11 2008-07-08 Brunswick Corporation Electronic voltage regulation for a marine returnless fuel system
DE102008024545A1 (de) * 2008-05-21 2009-11-26 Continental Automotive Gmbh Verfahren und Vorrichtung zur Diagnose eines Fehlers, insbesondere in einem Niederdruckbereich eines Kraftstoff-Einspritzsystems eines Verbrennungsmotors
DE102008053808B4 (de) * 2008-10-29 2022-05-25 Andreas Stihl Ag & Co. Kg Verfahren und Vorrichtung zum Fluten einer Kraftstoffzumesseinrichtung
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

Non-Patent Citations (2)

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Title
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See also references of WO2012052264A1 *

Also Published As

Publication number Publication date
WO2012052264A1 (fr) 2012-04-26
DE102011005592B4 (de) 2025-05-08
DE102011005592A1 (de) 2012-04-26
CN103201486B (zh) 2016-10-19
CN103201486A (zh) 2013-07-10

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