EP2449238A1 - Procédé et dispositif permettant de faire fonctionner un moteur à combustion interne - Google Patents

Procédé et dispositif permettant de faire fonctionner un moteur à combustion interne

Info

Publication number
EP2449238A1
EP2449238A1 EP10720183A EP10720183A EP2449238A1 EP 2449238 A1 EP2449238 A1 EP 2449238A1 EP 10720183 A EP10720183 A EP 10720183A EP 10720183 A EP10720183 A EP 10720183A EP 2449238 A1 EP2449238 A1 EP 2449238A1
Authority
EP
European Patent Office
Prior art keywords
internal combustion
combustion engine
time
injection valve
valve
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
Application number
EP10720183A
Other languages
German (de)
English (en)
Other versions
EP2449238B1 (fr
Inventor
Helerson Kemmer
Holger Rapp
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 EP2449238A1 publication Critical patent/EP2449238A1/fr
Application granted granted Critical
Publication of EP2449238B1 publication Critical patent/EP2449238B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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
    • F02D41/20—Output circuits, e.g. for controlling currents in command coils
    • 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

Definitions

  • the invention relates to a method for operating an internal combustion engine according to the preamble of claim 1.
  • the invention further relates to a computer program, an electrical storage medium and a control and / or regulating device.
  • Object of the present invention is to develop a method of the type mentioned, which further optimizes the fuel injection via the injectors. This object is achieved by a method having the features of claim 1. Further solutions are specified in the independent claims that relate to a computer program, an electrical storage medium and a control and / or regulating device. Advantageous developments of the invention are specified in subclaims. In addition, important features for the invention can be found in the following description and in the drawings. These features may be important for the invention both alone and in different combinations, without being explicitly referred to again.
  • an opening delay time of the injection valve is determined.
  • individual, differing inaccuracies of the valve elements, a valve seat and possibly also a magnet armature are taken into account, which lead to the opening delay time being subject to tolerances.
  • Actuator actuated injectors are not important to the process of the invention, i. the valve elements can both be firmly connected to the armature, or they can have a magnetic armature, which has a certain axial play with respect to the valve element.
  • the method according to the invention is based on the idea of determining that actuation duration at which a stroke movement of the valve element is no longer or just not possible and the valve thus remains closed. Thus, there is no valve opening time and no closing time.
  • the formula then reduces purely mathematically in:
  • Opening delay time activation duration (2) This means that for this case, the thus determined activation duration corresponds to the opening delay time, which can be regarded as constant irrespective of the actual activation duration during the driving operation in the simplest case.
  • the closing of the injection valve can be easily determined by various known methods, for example by means of sensors and / or by analysis of electrical or electromagnetic parameters. Some of these are already implemented to control and regulate the injectors. This therefore does not represent an additional cost factor.
  • the inventive method is particularly effective when the drive time is successively reduced until a closing of the injection valve just can not be determined, or the drive time is successively increased until a closing of the injection valve can be determined, and that the opening delay time for the Injection valve is determined from the time from the start of control until the last time or first closing.
  • a greater temporal jump can be carried out in the vicinity of the critical point and then approach the critical activation duration in small steps, in which the lifting and closing movement of the valve element is just recognized again is currently not recognized. It can be taken into account that with a minimal opening of the valve element, the closing can not be diagnosed and thus the diagnosed actuation time deviates from an exact value.
  • the determined value of the activation duration can be determined empirically
  • Adjustment values for example, from a test or test field, be corrected accordingly. It is also conceivable to approach the critical activation duration from both sides and then to form the exact critical activation time from both values determined according to a predetermined algorithm (for example by forming an average value).
  • the electrical operating variable is a time derivative (gradient) of a voltage of a magnetic coil of the electromagnetic actuator, and that is concluded from a minimum of the gradient on a closing of the injection valve.
  • the decaying electrical voltage of the electromagnetic actuator is influenced by a change in the mutual induction caused by the movement change of the valve element, so that a saddle-like voltage curve occurs, in which the point of inflection corresponds to the point of attachment of the valve element.
  • the time derivative (gradient) of the voltage curve is advantageous because the saddle-like course is transformed into an easily diagnosed minimum.
  • the first occurring minimum is to be considered after the end of the activation time, since, for example, further minima can be generated later by bouncing the valve element or the armature.
  • the implementation of the derivation of the voltage curve is possible in the control and / or regulating device easily and at low cost.
  • the method is repeated (for example, in each case after a certain operating time or a certain number of operating cycles)
  • the method can be carried out during operation of the internal combustion engine with multiple injections, in which case the change in the activation duration is carried out only in a single injection and compensated by changes in the control period of at least one other individual injection substantially torque and / or exhaust gas neutral. This means that the method does not disturb the operation of the internal combustion engine.
  • the method may also be performed in a coasting operation of the engine with a late firing angle.
  • This has the advantage that, for example, a fuel pressure can be freely varied as needed for a determination of the pressure dependence of the opening delay time.
  • the injection time can be increased gradually from the safe non-opening state of the injection valve until the first opening.
  • an impairment on the exhaust gas is mi nimal. If the activation is assigned a later firing angle, the combustion of the injected fuel takes place substantially neutral in terms of torque. This measure also serves to ensure that normal operation of the internal combustion engine is not hindered by the method.
  • Opening delay time for all injectors of an internal combustion engine is determined - reduced, which saves fuel and causes a homogenization of the operation of the internal combustion engine. Furthermore, it is proposed that the method be carried out for different fuel pressures and that a characteristic map be formed from the results of the method. This can then be used for example for a controlled or controlled operation of the fuel injection valves.
  • an embodiment of the invention will be explained in more detail with reference to the drawing. Show it:
  • Figure 1 is a schematic representation of an internal combustion engine with several
  • Figure 2 is a schematic representation of an injection valve of Figure 1;
  • FIG. 3 shows two diagrams in which, on the one hand, a drive current of the injection valve from FIG. 2 and, on the other hand, its effect on a stroke of the injection valve are plotted over time;
  • FIG. 4 shows three diagrams in which the drive current, the stroke and the derivative of the coil voltage are plotted over time (during normal operation of the internal combustion engine);
  • FIG. 5 shows three diagrams similar to FIG. 3, but with a control reduced in comparison to FIG. 3;
  • FIG. 6 shows three diagrams similar to FIG. 4, but with an activation shortened again compared to FIG. 4;
  • FIG. 7 shows a flow chart of a method for operating the internal combustion engine of FIG. 1.
  • an internal combustion engine bears the reference numeral 10 as a whole. It comprises a tank 12, from which a delivery system 14 delivers fuel into a common rail 16. To this several injectors 18a to 18d are connected, which inject the fuel directly into them associated combustion chambers 20a to 2Od. The operation of the internal combustion engine 10 is controlled or regulated by a control and regulating device 22 which, among other things, also controls the injection valves 18a to 18d.
  • the injection valve 18a is shown in greater detail by way of example. It comprises an electromagnetic actuator 24, which in turn comprises an electromagnetic coil 26 and a magnet armature 30 on a valve needle 28.
  • the armature 30 is firmly connected to the valve needle 28. It is also possible that between magnet armature 30 and valve needle
  • the injection valve 18a operates in principle as follows:
  • the injection valve 18a is shown in FIG. 2 in a closed state, ie the valve needle 28 bears against a valve seat 32.
  • an electrical voltage (“drive voltage”) is applied to an actuation of the magnet armature 30 via the control of the control and regulating device 22 and an output stage, which energizes the coil 26 and the valve needle 28 with appropriate strength and duration lifted from the valve seat 32.
  • FIG. 3 shows a schematic representation of such an activation of the injection valve 18a (as an exemplary example) and the effect on an opening time of the injection valve 18 over time.
  • FIG. 3 consists of two diagrams, the upper diagram showing the time profile of a drive current I and the lower diagram showing the stroke H of the injection valve 18a caused thereby.
  • the course of the drive current I in the upper diagram shows an initially rapid increase (see reference numeral 40), which is then kept constant over a certain period of time, in order then to drop by about half (see reference numeral 42). This current level is held until the end of the control period t.
  • the end of the drive duration t is characterized in that the current I is switched off (see reference numeral 44).
  • the valve needle 28 of the injection valve 18a lifts off after the beginning of the activation only after a certain opening delay time tu (compare reference number 46). If the valve needle 28 has reached its maximum stroke, a lesser drive current I is sufficient to maintain this level.
  • valve needle 28 If the drive current I is switched off, the valve needle 28 returns to the valve seat 32, but also with a delay (see reference numeral 48). The period of time from the switching off of the drive current I until complete closure is defined as the closing time t from the valve needle 28. The entire valve opening duration is identified by T op . Purely mathematically, then:
  • FIGS. 4 to 6 show three scenarios when the injection valve 18 is actuated at activation times t,. Each figure shows three diagrams. The upper diagram shows in each case the course of the drive current I, the middle diagram shows the course of the valve lift H and the lower diagram shows the course of a temporally first derivative ("time gradient") of the coil voltage after termination of the control decaying voltage UM at the magnetic coil 26
  • Figure 4 shows a scenario as it takes place, for example, in a normal operation.
  • opening delay time tu can be determined by the principle of a successive shortening of the activation duration.
  • Opening delay time tu allows the control and regulation of the single-point valves 18a to 18d and thereby to refine the entire injection process.
  • the starting point is a normal driving operation with the control duration t 1 (reference numeral 100) predetermined by the control and regulating device 22.
  • the control unit 22 checks in step 1 10 whether the external conditions of the internal combustion engine 10 allow a shortening of the drive time t, for at least one injection valve 18, without the driving operation of the internal combustion engine 10 is impaired. This would be, for example, given in a push operation. If this is possible, the activation period t 1 is reduced in step 120 for the selected injection valve 18. At the same time, the first derivative of the voltage curve U M for the associated magnetic coil 26 is formed.
  • step 130 If a minimum 50 is detected in the course of the first derivation (reference numeral 130), the actuation period t is further reduced (jump to step 120). If a minimum is no longer recognized, the critical actuation time t is reached. In this case, in step 140, the opening delay time tu is calculated from the difference between the drive start and drive end. If necessary, correction factors can also be incorporated. In step 150, the measured injection valve 18 in the control and
  • Control device characterized in that at the next measurement cycle, another injection valve 18 can be selected.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
  • Fuel-Injection Apparatus (AREA)

Abstract

L'invention concerne un procédé permettant de faire fonctionner un moteur à combustion interne (10), procédé selon lequel le carburant parvient dans au moins une chambre de combustion (20), par l'intermédiaire d'au moins une soupape d'injection (18) comprenant un dispositif de commande électromagnétique (24). En faisant varier une durée d'actionnement de la soupape d'injection (18), et en analysant un profil d'un paramètre de fonctionnement électrique de la soupape d'injection, caractérisant un déplacement d'un élément de soupape (28) de ladite soupape d'injection (18), on détermine un temps de retard d'ouverture de la soupape d'injection (18).
EP10720183.2A 2009-06-30 2010-06-01 Appareil et procédé de commande d'un moteur à combustion interne Active EP2449238B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE200910027311 DE102009027311A1 (de) 2009-06-30 2009-06-30 Verfahren zum Betreiben einer Brennkraftmaschine
PCT/EP2010/057647 WO2011000650A1 (fr) 2009-06-30 2010-06-01 Procédé et dispositif permettant de faire fonctionner un moteur à combustion interne

Publications (2)

Publication Number Publication Date
EP2449238A1 true EP2449238A1 (fr) 2012-05-09
EP2449238B1 EP2449238B1 (fr) 2017-04-26

Family

ID=42313709

Family Applications (1)

Application Number Title Priority Date Filing Date
EP10720183.2A Active EP2449238B1 (fr) 2009-06-30 2010-06-01 Appareil et procédé de commande d'un moteur à combustion interne

Country Status (6)

Country Link
US (1) US9026342B2 (fr)
EP (1) EP2449238B1 (fr)
JP (1) JP5784013B2 (fr)
CN (1) CN102472187B (fr)
DE (1) DE102009027311A1 (fr)
WO (1) WO2011000650A1 (fr)

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DE102012211585A1 (de) * 2012-07-04 2014-01-09 Robert Bosch Gmbh Verfahren zum Betreiben eines Fahrzeuges während eines Ausrollens
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US10557445B2 (en) * 2015-01-21 2020-02-11 Hitachi Automotive Systems, Ltd High-pressure fuel supply device for internal combustion engine
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DE102015219383B3 (de) * 2015-10-07 2017-02-09 Continental Automotive Gmbh Bestimmung eines Zeitpunktes, zu welchem sich ein Kraftstoffinjektor in einem vorbestimmten Zustand befindet
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Also Published As

Publication number Publication date
DE102009027311A1 (de) 2011-01-05
US9026342B2 (en) 2015-05-05
WO2011000650A1 (fr) 2011-01-06
CN102472187A (zh) 2012-05-23
CN102472187B (zh) 2014-11-12
US20120166069A1 (en) 2012-06-28
JP5784013B2 (ja) 2015-09-24
JP2012531561A (ja) 2012-12-10
EP2449238B1 (fr) 2017-04-26

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