EP1154142B1 - Method and apparatus for controlling fuel injection - Google Patents

Method and apparatus for controlling fuel injection Download PDF

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Publication number
EP1154142B1
EP1154142B1 EP01107985A EP01107985A EP1154142B1 EP 1154142 B1 EP1154142 B1 EP 1154142B1 EP 01107985 A EP01107985 A EP 01107985A EP 01107985 A EP01107985 A EP 01107985A EP 1154142 B1 EP1154142 B1 EP 1154142B1
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EP
European Patent Office
Prior art keywords
fuel
internal combustion
combustion engine
solenoid valve
power supply
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.)
Expired - Lifetime
Application number
EP01107985A
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German (de)
French (fr)
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EP1154142A3 (en
EP1154142A2 (en
Inventor
Rainer Pfau
Michael Schueller
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Robert Bosch GmbH
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Robert Bosch GmbH
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Publication of EP1154142A3 publication Critical patent/EP1154142A3/en
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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
    • 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
    • F02D41/20—Output circuits, e.g. for controlling currents in command coils
    • F02D2041/2003—Output circuits, e.g. for controlling currents in command coils using means for creating a boost voltage, i.e. generation or use of a voltage higher than the battery voltage, e.g. to speed up injector opening
    • F02D2041/2006—Output circuits, e.g. for controlling currents in command coils using means for creating a boost voltage, i.e. generation or use of a voltage higher than the battery voltage, e.g. to speed up injector opening by using a boost capacitor
    • 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
    • F02D2200/50—Input parameters for engine control said parameters being related to the vehicle or its components
    • F02D2200/503—Battery correction, i.e. corrections as a function of the state of the battery, its output or its type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D2250/00—Engine control related to specific problems or objectives
    • F02D2250/31—Control of the fuel pressure

Definitions

  • the invention relates to a method for controlling the fuel injection in an internal combustion engine according to the preamble of claim 1 and a device for controlling the fuel injection in an internal combustion engine according to the preamble of claim 7.
  • a method and apparatus for controlling fuel injection in an internal combustion engine are known from DE 197 46 980.
  • the fuel injection takes place by means of at least one Solenoid valve, which is controllable via an output stage of a control unit.
  • the Solenoid valve is a power supply device, in particular the on-board battery of a motor vehicle, intended.
  • the power supply can be stored via an electric charge Element done.
  • the power supply of the solenoid valve is preferably carried out alternately the power supply device and the element.
  • the element that exists as a capacitor can be recharged via the electromagnetic load of the solenoid valve.
  • the control of the solenoid valve during the opening period takes place as a function of at least one operating parameter. This can be, for example, the speed of the internal combustion engine.
  • a disadvantage of the known method or in the known device is that it in certain operating situations of the internal combustion engine to an unwanted fuel injection can come.
  • the method with the features mentioned in claim 1 and the device according to claim 7 offer the advantage that on the one hand the electric charge-storing element with its maximum allowable charging current can be charged, with unwanted fuel injections nevertheless surely avoided.
  • the invention is characterized in particular by the fact that in Dependence of at least one operating parameter of the internal combustion engine, the fuel supply pressure is reduced below a predetermined operating value.
  • the recharging of the electric charge storing element takes place by driving the electromagnetic Consumer of the solenoid valve, but the charging current is chosen so that the solenoid valve does not open yet. Especially at low voltages of the power supply device In conjunction with a high fuel supply pressure, it could be an unwanted Opening the solenoid valve come. This prevents the inventive method or the device according to the invention, since the fuel supply pressure is reduced. That is, the fuel supply pressure is reduced below a value for the operating point or the operating situation of the internal combustion engine would actually be necessary. By the Reduction of the fuel supply pressure can thus set the charging current for the element or be chosen to be in the permissible evaluation range of the control unit of the fuel injection lies.
  • the operating parameter for reducing the fuel supply pressure is the voltage level the power supply device. At low battery voltages will - for a quick recharge to reach the element - set the maximum allowable charging current. Yet is prevented by the reduction of the fuel supply pressure, that the solenoid valve during Reloading the item unintentionally opens. Particularly preferred is an embodiment in addition to the evaluation of the voltage level in addition the power supply device, the fuel supply pressure in dependence of Speed of the internal combustion engine is reduced. Especially at low speeds of the internal combustion engine Thus, the fuel supply pressure can be increased, the reloading the Elements plays a subordinate role, because a very fast reloading is not essential is. The charging current can thus be reduced, so that necessary for the start of the internal combustion engine Fuel supply pressure provided can be.
  • the amount of fuel in the fuel injection depending on the operating parameter the internal combustion engine with respect to a desired injection quantity of the fuel is reduced.
  • the control device would change the opening duration of the Increase the solenoid valve to the required amount of fuel provide. This could cause it a fuel injection outside of the the crankshaft position predetermined time window come.
  • the fuel quantity limitation according to the invention however, this reliably prevents, as the Limiting the amount of fuel over a shortened Opening control duration of the solenoid valve reached can be.
  • the opening time in particular depending on the speed of the internal combustion engine set. At very high speeds is the time window for fuel injection relatively short, because of the high speed the crankshaft of the internal combustion engine the Piston position, injected in the fuel can only be available for a short period of time. With the limitation of the fuel quantity respectively the opening drive duration is so prevents fuel against the cylinder wall squirts and thus no longer burn clean could, which could lead to engine damage.
  • the Fuel quantity depending on the reduced Fuel supply pressure and the speed of the Internal combustion engine set.
  • the fuel quantity depending the voltage level of the power supply device and the speed of the internal combustion engine to limit.
  • the following is purely an example of a Internal combustion engine with four cylinders. Of course, lower or higher numbers of cylinders possible. At least every cylinder is associated with a solenoid valve.
  • the internal combustion engine is particularly self-igniting, wherein the fuel supply preferably by means of So-called common rail technology can be done.
  • the device 1 shows a device 1 for controlling the fuel injection in a not shown here.
  • the device 1 comprises a control unit 2, which activates a power output stage 3, which in each case switches the load current I V (FIG. 2) of electromagnetic consumers 4 of solenoid valves 5.
  • the solenoid valves 5 By means of the solenoid valves 5, the fuel injection takes place in the cylinder of the internal combustion engine.
  • a pump 6 For the supply or promotion of fuel a pump 6 is provided, which consists of a Fuel tank 7 in a common supply line 8 promotes, to each of the solenoid valves. 5 connected. To the fuel pressure in the To be able to set supply line 8 is on Druckeinstellstoff 9 provided in the supply line 8 can be arranged and over the Control unit 2 according to the desired fuel supply pressure controllable and adjustable is.
  • the pressure adjusting means 9 may be for example, a pressure reducer or Pressure limiting device act. Alternatively or In addition, the pump power can also be varied become.
  • the electromagnetic consumers 4 are on the one hand via a power supply device 10 supplying, in particular, the on-board battery of the Motor vehicle is.
  • the electromagnetic Consumer 4 via an electrical charge storable element 11, in particular is designed as a capacitor 12.
  • the energy supply the electromagnetic consumer 4 Preferably takes place alternately from the power supply device 10 and the electric charge storing element 11.
  • the element 11 is charged via a charging circuit 13 via the electromagnetic load 4.
  • the released energy is transferred into the capacitor 12 with a reduction or switching off of the load current I V by the electromagnetic consumer. 4 Due to losses in the electrical control lines and the power amplifier 3 or the charging circuit 13, it is necessary to recharge the element 11 after the actuation of one of the solenoid valves 5.
  • the electromagnetic load 4 with a charging current I L ( Figure 2) is applied, which is below a maximum allowable opening current at which the solenoid valve 5 would open and inject fuel into the combustion chamber of the internal combustion engine.
  • the capacitor 12 is in turn charged, since the energy stored in the electromagnetic consumer 4 is released and transferred to the capacitor 12.
  • a drive cycle for one of the electromagnetic loads 4 during an injection process will be described below.
  • the electromagnetic load 4 from the element 11 is supplied with electrical energy.
  • the voltage U C of the capacitor 12 is substantially higher in comparison to the voltage U BAT of the power supply device 10 and may be, for example, 70 volts. Due to this high voltage U C occurs during the switch-on phase E to a large and rapid change in current, in which the load current I V increases to the attraction value I A , to open the solenoid valve 5 quickly.
  • the load current I V is lowered during the tightening phase A by opening and closing the power amplifier 3 and again raised to the value I A , so regulated.
  • a first rapid quenching phase S is activated, in which the load current I V is taken back to the holding value I H.
  • the fast-quenching phase S is followed by a holding phase H, during which the consumer current I V is kept essentially constant at the holding value I H by switching the output stage 3 on and off. If the injection process is completed, the power amplifier 3 is disabled.
  • a subsequent second rapid quenching phase S causes the load current I V to drop substantially to zero.
  • the energy stored in the consumer 4 is in turn stored back into the element 11.
  • the element 11 does not have the same state of charge as at the beginning of the switch-on phase E. It may therefore be necessary to recharge the element 11 fully.
  • the load 4 is supplied with a charging current I L, which, however, is chosen such that the solenoid valve 5 does not open.
  • the charging current I L is so often turned on and off during the charging phase L until the desired state of charge of the element 11 is reached, that is, the desired capacitor voltage U C is present.
  • the charging phase L must be chosen short enough so that the element 11 can deliver sufficient electrical charge when driving another consumer 4 . In order to accelerate the loading of the element 11, it will therefore be attempted to select the charging current I L as high as possible. If, however, the voltage level of the energy supply device 10 has dropped below its setpoint in this case, the current increase during the charging phase L is slower. The loading time would thus increase. If, at the same time, a very high charging current I V is chosen in order to require charging cycles Z as little as possible during the charging phase L, there is the risk that the solenoid valve 5 will open, although no fuel injection should take place. In order to prevent this, it is now advantageously provided to reduce the fuel supply pressure in the supply line 8.
  • the device 1 has a first evaluation device 14, to which the rotational speed n and the magnitude of the voltage U BAT of the energy supply device 10 are supplied as input variables.
  • the speed signal n can also reflect the averaged over a time interval speed of the internal combustion engine.
  • the first evaluation device 14 selects from a characteristic field the value for the fuel supply pressure, which can be reduced by means of the pressure adjustment means.
  • the Druckeinstellstoff 9 is driven accordingly to be able to adjust in the supply line 8, the reduced fuel supply pressure can.
  • a second evaluation device 15 which determines the maximum permissible opening activation duration for the solenoid valve 5 from a characteristic field as a function of the rotational speed n of the internal combustion engine and the voltage level U BAT of the energy supply device 10. This prevents fuel being injected into the internal combustion engine beyond a predetermined crankshaft rotation angle.
  • the control unit 2 thus limits the opening duration of the solenoid valve 5 as a function of the value determined by the second evaluation device 15. This means that the duration of the tightening phase A and the holding phase H are limited to a maximum permissible value for this operating situation of the internal combustion engine.
  • the holding and / or tightening phase can therefore be shorter than that shown in the diagram according to FIG.
  • the first and second evaluation devices 14 and 15 recognize this.
  • the control unit 2 is thus again communicated that normal operating conditions or parameters are present and the fuel supply pressure returns to the desired value for the Operating point or load state of the engine raised and the opening duration limit of the solenoid valve 5 can be canceled.
  • the pressure adjustment means 9 By appropriate activation of the pressure adjustment means 9, the desired fuel supply pressure in the supply line 8 can thus be set again.
  • the exemplary embodiment according to FIG. 3 of a device 1 differs from the exemplary embodiment according to FIG. 1 only in that the second evaluation device 15 now has the rotational speed n of the internal combustion engine and the fuel supply pressure in the line 8 as the input parameter.
  • a size converter can be provided, which converts the mechanical quantity "pressure" into a corresponding electrical variable.
  • the fuel injection quantity limitation is now controlled as a function of the engine speed n and the fuel supply pressure. At low voltage U BAT of the power supply device 10 so the fuel supply pressure in the supply line 8 is lowered.
  • the second evaluation device 15 can additionally have an evaluation input for the battery voltage U BAT .
  • the first evaluation device 14 controls the second evaluation device 15 accordingly.
  • the first evaluation device 14 could output a reset signal to the second evaluation unit 15 (represented by dashed lines) so that it cancels the fuel quantity limitation, ie the limited opening drive duration of the solenoid valve 5.

Description

Die Erfindung betrifft ein Verfahren zur Steuerung der Kraftstoffeinspritzung in eine Brennkraftmaschine gemäss Oberbegriff des Anspruchs 1 sowie eine Vorrichtung zur Steuerung der Kraftstoffeinspritzung in eine Brennkraftmaschine gemäss Oberbegriff des Anspruchs 7.The invention relates to a method for controlling the fuel injection in an internal combustion engine according to the preamble of claim 1 and a device for controlling the fuel injection in an internal combustion engine according to the preamble of claim 7.

Stand der TechnikState of the art

Ein Verfahren und eine Vorrichtung zur Steuerung der Kraftstoffeinspritzung in eine Brennkraftmaschine sind aus der DE 197 46 980 bekannt. Die Kraftstoffeinspritzung erfolgt mittels zumindest eines Magnetventils, das über eine Endstufe von einer Steuereinheit ansteuerbar ist. Für die Versorgung des Magnetventils ist eine Energieversorgungseinrichtung, insbesondere die Bordbatterie eines Kraftfahrzeugs, vorgesehen. Außerdem kann die Energieversorgung über ein elektrische Ladung speicherndes Element erfolgen. Die Energieversorgung des Magnetventils erfolgt vorzugsweise abwechselnd aus der Energieversorgungseinrichtung und dem Element. Das Element, das als Kondensator vorliegen kann, wird über den elektromagnetischen Verbraucher des Magnetventils wieder geladen. Die Ansteuerung des Magnetventils während der Öffnungsdauer erfolgt in Abhängigkeit zumindest eines Betriebsparameters. Dieser kann beispielsweise die Drehzahl der Brennkraftmaschine sein.A method and apparatus for controlling fuel injection in an internal combustion engine are known from DE 197 46 980. The fuel injection takes place by means of at least one Solenoid valve, which is controllable via an output stage of a control unit. For the supply of the Solenoid valve is a power supply device, in particular the on-board battery of a motor vehicle, intended. In addition, the power supply can be stored via an electric charge Element done. The power supply of the solenoid valve is preferably carried out alternately the power supply device and the element. The element that exists as a capacitor can be recharged via the electromagnetic load of the solenoid valve. The control of the solenoid valve during the opening period takes place as a function of at least one operating parameter. This can be, for example, the speed of the internal combustion engine.

Nachteilig bei dem bekannten Verfahren beziehungsweise bei der bekannten Vorrichtung ist, dass es in bestimmten Betriebssituationen der Brennkraftmaschine zu einer ungewollten Kraftstoffeinspritzung kommen kann.A disadvantage of the known method or in the known device is that it in certain operating situations of the internal combustion engine to an unwanted fuel injection can come.

In der DE 197 31 102 ist ein Kraftstoffversorgungssystem für eine Brennkraftmaschine beschrieben. Hierbei handelt es sich um eine sogenannte direkteinspritzende Benzinbrennkraftmaschine. Dort ist vorgesehen, dass im Schubbetrieb, d. h. abhängig von der Drehzahl der Brennkraftmaschine die Pumpleistung der Hochdruckpumpe reduziert wird, da im Schubbetrieb ein niedrigerer Kraftstoffdruck ausreichend ist, da dort kein Schichtladungsbetrieb vorgesehen ist.In DE 197 31 102 a fuel supply system for an internal combustion engine is described. This is a so-called direct injection gasoline engine. There is provided that in overrun, d. H. depending on the speed of the internal combustion engine Pumping power of the high-pressure pump is reduced because in the overrun lower fuel pressure is sufficient, since there is no stratified charge operation is provided.

Aus der DE 39 01 660 ist ebenfalls eine Steuervorrichtung für eine Kraftstoffeinspritzung bekannt. Dort werden Einspritzventile von einer Kraftstoffpumpe mit Kraftstoff versorgt. Ein Abfall der Spannungsversorgung hat zur Folge, dass der Kraftstoffdruck sinkt. Um dies zu korrigieren, werden die Ansteuerdauem der Injektoren verlängert. From DE 39 01 660 a control device for a fuel injection is also known. There injectors are supplied by a fuel pump with fuel. A drop in the power supply As a result, the fuel pressure drops. To correct this, the Activation duration of the injectors extended.

Vorteile der ErfindungAdvantages of the invention

Das Verfahren mit den in Anspruch 1 genannten Merkmalen sowie die Vorrichtung gemäss Anspruch 7 bieten demgegenüber den Vorteil, dass einerseits das elektrische Ladung speichernde Element mit seinem maximal zulässigen Ladestrom geladen werden kann, wobei ungewollte Kraftstoffeinspritzungen dennoch sicher vermieden sind. Die Erfindung zeichnet sich insbesondere dadurch aus, dass in Abhängigkeit zumindest eines Betriebsparameters der Brennkraftmaschine der Kraftstoffversorgungsdruck unter einen vorgebbaren Betriebswert reduziert wird.The method with the features mentioned in claim 1 and the device according to claim 7 offer the advantage that on the one hand the electric charge-storing element with its maximum allowable charging current can be charged, with unwanted fuel injections nevertheless surely avoided. The invention is characterized in particular by the fact that in Dependence of at least one operating parameter of the internal combustion engine, the fuel supply pressure is reduced below a predetermined operating value.

Das Wiederaufladen des elektrische Ladung speichernden Elements erfolgt durch Ansteuern des elektromagnetischen Verbrauchers des Magnetventils, wobei jedoch der Ladestrom so gewählt wird, dass das Magnetventil noch nicht öffnet. Insbesondere bei niedrigen Spannungen der Energieversorgungseinrichtung in Verbindung mit einem hohen Kraftstoffversorgungsdruck könnte es also zu einem ungewollten Öffnen des Magnetventils kommen. Dies verhindert das erfindungsgemäße Verfahren beziehungsweise die erfindungsgemäße Vorrichtung, da der Kraftstoffversorgungsdruck reduziert wird. Das heißt, der Kraftstoffversorgungsdruck wird unter einen Wert reduziert, der für den Arbeitspunkt beziehungsweise die Betriebssituation der Brennkraftmaschine eigentlich notwendig wäre. Durch die Reduzierung des Kraftstoffversorgungsdruckes kann also der Ladestrom für das Element so eingestellt beziehungsweise gewählt werden, dass er im zulässigen Auswertebereich der Steuereinheit der Kraftstoffeinspritzung liegt.The recharging of the electric charge storing element takes place by driving the electromagnetic Consumer of the solenoid valve, but the charging current is chosen so that the solenoid valve does not open yet. Especially at low voltages of the power supply device In conjunction with a high fuel supply pressure, it could be an unwanted Opening the solenoid valve come. This prevents the inventive method or the device according to the invention, since the fuel supply pressure is reduced. That is, the fuel supply pressure is reduced below a value for the operating point or the operating situation of the internal combustion engine would actually be necessary. By the Reduction of the fuel supply pressure can thus set the charging current for the element or be chosen to be in the permissible evaluation range of the control unit of the fuel injection lies.

Der Betriebsparameter für die Reduzierung des Kraftstoffversorgungsdruckes ist die Spannungshöhe der Energieversorgungseinrichtung. Bei niedrigen Batteriespannungen wird - um eine schnelle Nachladung des Elements erreichen zu können - der maximal zulässige Ladestrom eingestellt. Dennoch wird durch die Reduzierung des Kraftstoffversorgungsdruckes verhindert, dass das Magnetventil beim Nachladen des Elements ungewollt öffnet. Besonders bevorzugt wird eine Ausführungsform, bei der zusätzlich neben der Auswertung der Spannungshöhe der Energieversorgungseinrichtung der Kraftstoffversorgungsdruck in Abhängigkeit der Drehzahl der Brennkraftmaschine reduziert wird. Insbesondere bei niedrigen Drehzahlen der Brennkraftmaschine kann somit der Kraftstoffversorgungsdruck erhöht werden, wobei das Nachladen des Elements eine untergeordnete Rolle spielt, da ein sehr schnelles Nachladen nicht unbedingt erforderlich ist. Der Ladestrom kann somit reduziert werden, so dass der für den Start der Brennkraftmaschine notwendige Kraftstoffversorgungsdruck bereitgestellt werden kann.The operating parameter for reducing the fuel supply pressure is the voltage level the power supply device. At low battery voltages will - for a quick recharge to reach the element - set the maximum allowable charging current. Yet is prevented by the reduction of the fuel supply pressure, that the solenoid valve during Reloading the item unintentionally opens. Particularly preferred is an embodiment in addition to the evaluation of the voltage level in addition the power supply device, the fuel supply pressure in dependence of Speed of the internal combustion engine is reduced. Especially at low speeds of the internal combustion engine Thus, the fuel supply pressure can be increased, the reloading the Elements plays a subordinate role, because a very fast reloading is not essential is. The charging current can thus be reduced, so that necessary for the start of the internal combustion engine Fuel supply pressure provided can be.

In einer Weiterbildung der Erfindung ist vorgesehen, dass die Kraftstoffmenge bei der Kraftstoffeinspritzung in Abhängigkeit des Betriebsparameters der Brennkraftmaschine gegenüber einer Soll-Einspritzmenge des Kraftstoffs reduziert ist. Jede Betriebssituation beziehungsweise jeder Arbeitspunkt der Brennkraftmaschine erfordert eine bestimmte Kraftstoffmenge, die beispielsweise über die Öffnungsdauer des Magnetventils eingestellt wird. Da durch die Reduzierung des Kraftstoffversorgungsdruckes und bei gleicher Öffnungsdauer eine geringere Kraftstoffmenge zugemessen werden würde, würde die Steuereinrichtung die Öffnungsdauer des Magnetventils erhöhen, um die erforderliche Kraftstoffmenge bereitzustellen. Dadurch könnte es zu einer Kraftstoffeinspritzung außerhalb des durch die Kurbelwellenstellung vorgegebenen Zeitfensters kommen. Die erfindungsgemäße Kraftstoffmengenbegrenzung verhindert dies jedoch zuverlässig, da die Begrenzung der Kraftstoffmenge über eine verkürzte Öffnungs-Ansteuerdauer des Magnetventils erreicht werden kann.In a further development of the invention, it is provided that the amount of fuel in the fuel injection depending on the operating parameter the internal combustion engine with respect to a desired injection quantity of the fuel is reduced. each Operating situation or each operating point the internal combustion engine requires a certain Fuel quantity, for example, over set the opening duration of the solenoid valve becomes. Because by reducing the fuel supply pressure and with the same opening duration one lower fuel quantity would be attributed the control device would change the opening duration of the Increase the solenoid valve to the required amount of fuel provide. This could cause it a fuel injection outside of the the crankshaft position predetermined time window come. The fuel quantity limitation according to the invention However, this reliably prevents, as the Limiting the amount of fuel over a shortened Opening control duration of the solenoid valve reached can be.

Um die verkürzte Öffnungs-Ansteuerdauer des Magnetventils zu realisieren, wird die Öffnungsdauer insbesondere in Abhängigkeit der Drehzahl der Brennkraftmaschine eingestellt. Bei sehr hohen Drehzahlen ist das Zeitfenster für die Kraftstoffeinspritzung relativ kurz bemessen, da durch die hohe Drehzahl der Kurbelwelle der Brennkraftmaschine die Kolbenstellung, bei der Kraftstoff eingespritzt werden kann, nur für einen kurzen Zeitraum vorliegt. Mit der Begrenzung der Kraftstoffmenge beziehungsweise der Öffnungs-Ansteuerdauer wird also verhindert, dass Kraftstoff gegen die Zylinderwand spritzt und somit nicht mehr sauber verbrennen könnte, was zu einem Motorschaden führen könnte.To the shortened opening-driving duration of the solenoid valve To realize, the opening time in particular depending on the speed of the internal combustion engine set. At very high speeds is the time window for fuel injection relatively short, because of the high speed the crankshaft of the internal combustion engine the Piston position, injected in the fuel can only be available for a short period of time. With the limitation of the fuel quantity respectively the opening drive duration is so prevents fuel against the cylinder wall squirts and thus no longer burn clean could, which could lead to engine damage.

In besonders bevorzugter Ausführungsform wird die Kraftstoffmenge in Abhängigkeit des reduzierten Kraftstoffversorgungsdruckes und der Drehzahl der Brennkraftmaschine eingestellt. Alternativ ist es jedoch auch möglich, die Kraftstoffmenge in Abhängigkeit der Spannungshöhe der Energieversorgungseinrichtung und der Drehzahl der Brennkraftmaschine zu begrenzen.In a particularly preferred embodiment, the Fuel quantity depending on the reduced Fuel supply pressure and the speed of the Internal combustion engine set. Alternatively it is but also possible, the fuel quantity depending the voltage level of the power supply device and the speed of the internal combustion engine to limit.

Weitere Ausgestaltungen ergeben sich aus den Unteransprüchen.Further embodiments emerge from the subclaims.

Zeichnungdrawing

Die Erfindung wird nachfolgend anhand von Ausführungsbeispielen mit Bezug auf die Zeichnung näher erläutert. Es zeigen:

Figur 1
ein erstes Ausführungsbeispiel einer Vorrichtung zur Steuerung der Kraftstoffeinspritzung,
Figur 2
über der Zeit den Verbraucherstrom eines elektromagnetischen Verbrauchers und
Figur 3
ein zweites Ausführungsbeispiel einer Vorrichtung zur Steuerung der Kraftstoffeinspritzung.
The invention will be explained in more detail with reference to embodiments with reference to the drawings. Show it:
FIG. 1
a first embodiment of a device for controlling the fuel injection,
FIG. 2
over time the consumer current of an electromagnetic consumer and
FIG. 3
A second embodiment of a device for controlling the fuel injection.

Beschreibung der AusführungsbeispieleDescription of the embodiments

Im Folgenden wird rein beispielhaft von einer Brennkraftmaschine mit vier Zylindern ausgegangen. Selbstverständlich sind niedrigere oder höhere Zylinderzahlen möglich. Jedem Zylinder ist zumindest ein Magnetventil zugeordnet. Die Brennkraftmaschine ist insbesondere selbstzündend ausgebildet, wobei die Kraftstoffversorgung vorzugsweise mittels der sogenannten Common-Rail-Technik erfolgen kann.The following is purely an example of a Internal combustion engine with four cylinders. Of course, lower or higher numbers of cylinders possible. At least every cylinder is associated with a solenoid valve. The internal combustion engine is particularly self-igniting, wherein the fuel supply preferably by means of So-called common rail technology can be done.

Figur 1 zeigt eine Vorrichtung 1 zur Steuerung der Kraftstoffeinspritzung in eine hier nicht dargestellte. Brennkraftmaschine. Die Vorrichtung 1 umfasst eine Steuereinheit 2, die eine Leistungsendstufe 3 ansteuert, die jeweils den Verbraucherstrom IV (Figur 2) von elektromagnetischen Verbrauchern 4 von Magnetventilen 5 schaltet. Mittels der Magnetventile 5 erfolgt die Kraftstoffeinspritzung in die Zylinder der Brennkraftmaschine.1 shows a device 1 for controlling the fuel injection in a not shown here. Internal combustion engine. The device 1 comprises a control unit 2, which activates a power output stage 3, which in each case switches the load current I V (FIG. 2) of electromagnetic consumers 4 of solenoid valves 5. By means of the solenoid valves 5, the fuel injection takes place in the cylinder of the internal combustion engine.

Für die Kraftstoffversorgung beziehungsweise -förderung ist eine Pumpe 6 vorgesehen, die aus einem Kraftstofftank 7 in eine gemeinsame Versorgungsleitung 8 fördert, an die jedes der Magnetventile 5 angeschlossen ist. Um den Kraftstoffdruck in der Versorgungsleitung 8 einstellen zu können, ist ein Druckeinstellmittel 9 vorgesehen, das in der Versorgungsleitung 8 angeordnet sein kann und über die Steuereinheit 2 entsprechend dem gewünschten Kraftstoffversorgungsdruck ansteuer- und einstellbar ist. Bei dem Druckeinstellmittel 9 kann es sich beispielsweise um eine Druckminder- beziehungsweise Druckbegrenzungseinrichtung handeln. Alternativ oder zusätzlich kann auch die Pumpleistung variiert werden.For the supply or promotion of fuel a pump 6 is provided, which consists of a Fuel tank 7 in a common supply line 8 promotes, to each of the solenoid valves. 5 connected. To the fuel pressure in the To be able to set supply line 8 is on Druckeinstellmittel 9 provided in the supply line 8 can be arranged and over the Control unit 2 according to the desired fuel supply pressure controllable and adjustable is. The pressure adjusting means 9 may be for example, a pressure reducer or Pressure limiting device act. Alternatively or In addition, the pump power can also be varied become.

Die elektromagnetischen Verbraucher 4 sind einerseits über eine Energieversorgungseinrichtung 10 versorgbar, die insbesondere die Bordbatterie des Kraftfahrzeugs ist. Außerdem sind die elektromagnetischen Verbraucher 4 über ein elektrische Ladung speicherndes Element 11 versorgbar, das insbesondere als Kondensator 12 ausgebildet ist. Die Energieversorgung der elektromagnetischen Verbraucher 4 erfolgt vorzugsweise abwechselnd aus der Energieversorgungseinrichtung 10 und dem elektrische Ladung speichernden Element 11.The electromagnetic consumers 4 are on the one hand via a power supply device 10 supplying, in particular, the on-board battery of the Motor vehicle is. In addition, the electromagnetic Consumer 4 via an electrical charge storable element 11, in particular is designed as a capacitor 12. The energy supply the electromagnetic consumer 4 Preferably takes place alternately from the power supply device 10 and the electric charge storing element 11.

Das Element 11 wird über eine Ladeschaltung 13 über die elektromagnetischen Verbraucher 4 aufgeladen. Dazu ist vorgesehen, dass bei einer Reduzierung beziehungsweise Abschaltung des Verbraucherstroms IV durch die elektromagnetischen Verbraucher 4 die freiwerdende Energie in den Kondensator 12 umgeladen wird. Durch Verluste in den elektrischen Ansteuerleitungen und der Endstufe 3 beziehungsweise der Ladeschaltung 13 ist es jedoch notwendig, nach der Betätigung eines der Magnetventile 5 das Element 11 nachzuladen. Hierbei wird der elektromagnetische Verbraucher 4 mit einem Ladestrom IL (Figur 2) beaufschlagt, der unterhalb eines maximal zulässigen Öffnungsstroms liegt, bei dem das Magnetventil 5 öffnen und Kraftstoff in den Brennraum der Brennkraftmaschine einspritzen würde. Durch Zurücknahme oder Abschalten des Ladestroms IL wird wiederum der Kondensator 12 aufgeladen, da die im elektromagnetischen Verbraucher 4 gespeicherte Energie freigegeben und in den Kondensator 12 umgeladen wird.The element 11 is charged via a charging circuit 13 via the electromagnetic load 4. For this purpose, it is provided that the released energy is transferred into the capacitor 12 with a reduction or switching off of the load current I V by the electromagnetic consumer. 4 Due to losses in the electrical control lines and the power amplifier 3 or the charging circuit 13, it is necessary to recharge the element 11 after the actuation of one of the solenoid valves 5. Here, the electromagnetic load 4 with a charging current I L (Figure 2) is applied, which is below a maximum allowable opening current at which the solenoid valve 5 would open and inject fuel into the combustion chamber of the internal combustion engine. By withdrawing or switching off the charging current I L , the capacitor 12 is in turn charged, since the energy stored in the electromagnetic consumer 4 is released and transferred to the capacitor 12.

Anhand von Figur 2 wird im Folgenden ein Ansteuerzyklus für einen der elektromagnetischen Verbraucher 4 während eines Einspritzvorganges beschrieben. Während der Einschaltphase E wird der elektromagnetische Verbraucher 4 aus dem Element 11 mit elektrischer Energie versorgt. Die Spannung UC des Kondensators 12 ist im Vergleich zu der Spannung UBAT der Energieversorgungseinrichtung 10 wesentlich höher und kann beispielsweise 70 Volt betragen. Durch diese hohe Spannung UC kommt es während der Einschaltphase E zu einer großen und schnellen Stromänderung, bei der der Verbraucherstrom IV auf den Anzugswert IA ansteigt, um das Magnetventil 5 schnell öffnen zu können. Am Ende der Einschaltphase E beziehungsweise am Anfang einer Anzugsphase A erfolgt die Energieversorgung des Verbraucher über die Energieversorgungseinrichtung 10. Der Verbraucherstrom IV wird während der Anzugsphase A durch Öffnen und Schließen der Endstufe 3 abgesenkt und wieder auf den Wert IA angehoben, also geregelt. Am Ende der Anzugsphase A wird eine erste Schnelllöschphase S aktiviert, bei der der Verbraucherstrom IV auf den Haltewert IH zurückgenommen wird. Während der Schnelllöschphase S wird die im elektromagnetischen Verbraucher 4 gespeicherte Energie in das Element 11 rückgespeist. An die Schnelllöschphase S schließt sich eine Haltephase H an, während der der Verbraucherstrom IV im Wesentlichen auf dem Haltewert IH durch Ein- und Ausschalten der Endstufe 3 konstant gehalten wird. Ist der Einspritzvorgang abgeschlossen, wird die Endstufe 3 gesperrt. Eine anschließende zweite Schnelllöschphase S lässt den Verbraucherstrom IV im Wesentlichen auf Null absinken. Dabei wird die im Verbraucher 4 gespeicherte Energie wiederum in das Element 11 rückgespeichert. Durch elektrische Verluste weist das Element 11 jedoch nicht denselben Ladungszustand wie beim Beginn der Einschaltphase E auf. Es kann daher notwendig sein, das Element 11 wieder voll aufzuladen. Hierzu wird während einer Ladephase L der Verbraucher 4 mit einem Ladestrom IL beaufschlagt, der jedoch so gewählt ist, dass es nicht zu einem Öffnen des Magnetventils 5 kommt. Der Ladestrom IL wird während der Ladephase L so oft ein- und ausgeschaltet, bis der gewünschte Ladezustand des Elements 11 erreicht ist, also die gewünschte Kondensatorspannung UC vorliegt.Based on FIG. 2, a drive cycle for one of the electromagnetic loads 4 during an injection process will be described below. During the switch-on phase E, the electromagnetic load 4 from the element 11 is supplied with electrical energy. The voltage U C of the capacitor 12 is substantially higher in comparison to the voltage U BAT of the power supply device 10 and may be, for example, 70 volts. Due to this high voltage U C occurs during the switch-on phase E to a large and rapid change in current, in which the load current I V increases to the attraction value I A , to open the solenoid valve 5 quickly. At the end of the switch-on phase E or at the beginning of a tightening phase A, the power supply of the consumer via the power supply device 10. The load current I V is lowered during the tightening phase A by opening and closing the power amplifier 3 and again raised to the value I A , so regulated. At the end of the tightening phase A, a first rapid quenching phase S is activated, in which the load current I V is taken back to the holding value I H. During the rapid quenching phase S, the energy stored in the electromagnetic consumer 4 is fed back into the element 11. The fast-quenching phase S is followed by a holding phase H, during which the consumer current I V is kept essentially constant at the holding value I H by switching the output stage 3 on and off. If the injection process is completed, the power amplifier 3 is disabled. A subsequent second rapid quenching phase S causes the load current I V to drop substantially to zero. In this case, the energy stored in the consumer 4 is in turn stored back into the element 11. However, due to electrical losses, the element 11 does not have the same state of charge as at the beginning of the switch-on phase E. It may therefore be necessary to recharge the element 11 fully. For this purpose, during a charging phase L, the load 4 is supplied with a charging current I L, which, however, is chosen such that the solenoid valve 5 does not open. The charging current I L is so often turned on and off during the charging phase L until the desired state of charge of the element 11 is reached, that is, the desired capacitor voltage U C is present.

Insbesondere bei hohen Drehzahlen n der Brennkraftmaschine oder wenn während eines Kraftstoffzumesszyklus' mehrere Einspritzvorgänge (beispielsweise für Katalysator-Heizmaßnahmen) vorgesehen sind, muss die Ladephase L ausreichend kurz gewählt sein, damit das Element 11 bei der Ansteuerung eines anderen Verbrauchers 4 genügend elektrische Ladung abgeben kann. Um das Laden des Elements 11 zu beschleunigen, wird also versucht werden, den Ladestrom IL so hoch wie möglich zu wählen. Ist in diesem Fall jedoch die Spannungshöhe der Energieversorgungseinrichtung 10 unterhalb ihres Sollwertes abgesunken, erfolgt der Stromanstieg während der Ladephase L langsamer. Die Ladezeit würde sich somit erhöhen. Wird nun gleichzeitig ein sehr hoher Ladestrom IV gewählt, um so wenig wie möglich Ladeteilzyklen Z während der Ladephase L zu benötigen, besteht die Gefahr, dass das Magnetventil 5 öffnet, obwohl keine Kraftstoffeinspritzung erfolgen soll. Um dies zu verhindern, ist nun in vorteilhafter Weise vorgesehen, den Kraftstoffversorgungsdruck in der Versorgungsleitung 8 zu reduzieren.In particular, at high speeds n of the internal combustion engine or if during a Kraftstoffzumesszyklus' multiple injections (for example, catalyst heating measures) are provided, the charging phase L must be chosen short enough so that the element 11 can deliver sufficient electrical charge when driving another consumer 4 , In order to accelerate the loading of the element 11, it will therefore be attempted to select the charging current I L as high as possible. If, however, the voltage level of the energy supply device 10 has dropped below its setpoint in this case, the current increase during the charging phase L is slower. The loading time would thus increase. If, at the same time, a very high charging current I V is chosen in order to require charging cycles Z as little as possible during the charging phase L, there is the risk that the solenoid valve 5 will open, although no fuel injection should take place. In order to prevent this, it is now advantageously provided to reduce the fuel supply pressure in the supply line 8.

Um dies zu ermöglichen, weist die Vorrichtung 1 eine erste Auswerteeinrichtung 14 auf, der als Eingangsgrößen die Drehzahl n und die Höhe der Spannung UBAT der Energieversorgungseinrichtung 10 zugeführt sind. Das Drehzahlsignal n kann auch die über ein Zeitintervall gemittelte Drehzahl der Brennkraftmaschine wiedergeben. In Abhängigkeit der Drehzahl n und der Spannungshöhe der Energieversorgungseinrichtung 10 wählt die erste Auswerteeinrichtung 14 aus einem Kennlinienfeld den Wert für den Kraftstoffversorgungsdruck aus, auf den mittels des Druckeinstellmittels reduziert werden kann. Über die Steuereinheit 2 wird das Druckeinstellmittel 9 entsprechend angesteuert, um in der Versorgungsleitung 8 den reduzierten Kraftstoffversorgungsdruck einstellen zu können. Da bestimmten Betriebssituationen beziehungsweise Arbeitspunkten der Brennkraftmaschine bestimmte Kraftstoffmengen zugeordnet sind, würde nun bei einem reduzierten Kraftstoffversorgungsdruck die Öffnungsdauer des Magnetventils 5 von der Steuereinheit 2 erhöht werden, um die erforderliche Kraftstoffmenge bereitstellen zu können. Um dies zu verhindern, ist eine zweite Auswerteeinrichtung 15 vorgesehen, die in Abhängigkeit der Drehzahl n der Brennkraftmaschine und der Spannungshöhe UBAT der Energieversorgungseinrichtung 10 aus einem Kennlinienfeld die maximal zulässige Öffnungs-Ansteuerdauer für das Magnetventil 5 ermittelt. Somit wird verhindert, dass über einen vorgegebenen Kurbelwellendrehwinkel hinaus Kraftstoff in die Brennkraftmaschine eingespritzt wird. Die Steuereinheit 2 begrenzt also in Abhängigkeit des von der zweiten Auswerteeinrichtung 15 ermittelten Wertes die Öffnungsdauer des Magnetventils 5. Das heißt, dass die Dauer der Anzugsphase A und der Haltephase H für diese Betriebssituation der Brennkraftmaschine auf einen maximal zulässigen Wert begrenzt werden. Die Halte- und/oder Anzugsphase kann also kürzer sein als es im Diagramm nach Figur 2 wiedergegeben ist.In order to make this possible, the device 1 has a first evaluation device 14, to which the rotational speed n and the magnitude of the voltage U BAT of the energy supply device 10 are supplied as input variables. The speed signal n can also reflect the averaged over a time interval speed of the internal combustion engine. Depending on the rotational speed n and the voltage level of the energy supply device 10, the first evaluation device 14 selects from a characteristic field the value for the fuel supply pressure, which can be reduced by means of the pressure adjustment means. About the control unit 2, the Druckeinstellmittel 9 is driven accordingly to be able to adjust in the supply line 8, the reduced fuel supply pressure can. Since certain operating conditions or operating points of the internal combustion engine are assigned certain amounts of fuel, the opening duration of the solenoid valve 5 would now be increased by the control unit 2 at a reduced fuel supply pressure to provide the required amount of fuel can. In order to prevent this, a second evaluation device 15 is provided which determines the maximum permissible opening activation duration for the solenoid valve 5 from a characteristic field as a function of the rotational speed n of the internal combustion engine and the voltage level U BAT of the energy supply device 10. This prevents fuel being injected into the internal combustion engine beyond a predetermined crankshaft rotation angle. The control unit 2 thus limits the opening duration of the solenoid valve 5 as a function of the value determined by the second evaluation device 15. This means that the duration of the tightening phase A and the holding phase H are limited to a maximum permissible value for this operating situation of the internal combustion engine. The holding and / or tightening phase can therefore be shorter than that shown in the diagram according to FIG.

Regeneriert sich die Energieversorgungseinrichtung 10 wieder, steigt also die Spannung UBAT an, erkennen dies die erste und zweite Auswerteeinrichtung 14 und 15. An die Steuereinheit 2 wird somit wieder übermittelt, dass normale Betriebsbedingungen beziehungsweise Parameter vorliegen und der Kraftstoffversorgungsdruck wieder auf den Sollwert für den Arbeitspunkt beziehungsweise Lastzustand der Brennkraftmaschine angehoben und die Öffnungsdauerbegrenzung des Magnetventils 5 wieder aufgehoben werden kann. Durch entsprechende Ansteuerung des Drückeinstellmittels 9 kann somit der Soll-Kräftstoffversorgungsdruck in der Versorgungsleitung 8 wieder eingestellt werden.If the energy supply device 10 regenerates again, ie the voltage U BAT increases , the first and second evaluation devices 14 and 15 recognize this. The control unit 2 is thus again communicated that normal operating conditions or parameters are present and the fuel supply pressure returns to the desired value for the Operating point or load state of the engine raised and the opening duration limit of the solenoid valve 5 can be canceled. By appropriate activation of the pressure adjustment means 9, the desired fuel supply pressure in the supply line 8 can thus be set again.

Das Ausführungsbeispiel gemäß Figur 3 einer Vorrichtung 1 unterscheidet sich vom Ausführungsbeispiel nach Figur 1 lediglich dadurch, dass die zweite Auswerteeinrichtung 15 als Eingangsparameter nunmehr die Drehzahl n der Brennkraftmaschine und den Kraftstoffversorgungsdruck in der Leitung 8 aufweist. Hierfür kann einen Größenwandler vorgesehen sein, der die mechanische Größe "Druck" in eine entsprechende elektrische Größe umsetzt. Die Mengenbegrenzung bei der Kraftstoffeinspritzung wird nunmehr in Abhängigkeit der Drehzahl n der Brennkraftmaschine und des Kraftstoffversorgungsdruckes gesteuert. Bei niedriger Spannung UBAT der Energieversorgungseinrichtung 10 wird also der Kraftstoffversorgungsdruck in der Versorgungsleitung 8 abgesenkt. Dies erkennt die zweite Auswerteschaltung 15 und wählt aus dem Kennlinienfeld in Abhängig dieses Druckes und der Drehzahl n die maximal mögliche Öffnungsdauer des Magnetventils 5 aus und teilt diesen Wert der Steuereinrichtung 2 mit, so dass eine maximal mögliche Öffnungsdauer des Magnetventils 5 nicht überschritten wird. Die Kraftstoffmengenbegrenzung wird also wie beim Ausführungsbeispiel der Vorrichtung 1 nach Figur 1 ebenso erreicht.The exemplary embodiment according to FIG. 3 of a device 1 differs from the exemplary embodiment according to FIG. 1 only in that the second evaluation device 15 now has the rotational speed n of the internal combustion engine and the fuel supply pressure in the line 8 as the input parameter. For this purpose, a size converter can be provided, which converts the mechanical quantity "pressure" into a corresponding electrical variable. The fuel injection quantity limitation is now controlled as a function of the engine speed n and the fuel supply pressure. At low voltage U BAT of the power supply device 10 so the fuel supply pressure in the supply line 8 is lowered. This recognizes the second evaluation circuit 15 and selects from the characteristic field in response to this pressure and the speed n, the maximum possible opening duration of the solenoid valve 5 and shares this value of the control device 2, so that a maximum possible opening duration of the solenoid valve 5 is not exceeded. The fuel quantity limitation is thus achieved as in the embodiment of the device 1 of Figure 1 as well.

Steigt die Batteriespannung UBAT wieder an, soll die Vorrichtung 1 nach Figur 3 beziehungsweise die Brennkraftmaschine wieder in die normale Betriebssituation überführt werden. Damit dies besonders sicher möglich ist, kann die zweite Auswerteeinrichtung 15 zusätzlich einen Auswerteeingang für die Batteriespannung UBAT aufweisen. Es könnte jedoch auch vorgesehen sein, dass die erste Auswerteeinrichtung 14 die zweite Auswerteeinrichtung 15 entsprechend ansteuert. Hierzu könnte beispielsweise die erste Auswerteeinrichtung 14 ein Resetsignal an die zweite Auswerteeinheit 15 ausgeben (gestrichelt dargestellt), damit diese die Kraftstoffmengenbegrenzung, also die begrenzte Öffnungs-Ansteuerdauer des Magnetventils 5, wieder aufhebt.If the battery voltage U BAT rises again, the device 1 according to FIG. 3 or the internal combustion engine is to be returned to the normal operating situation. For this to be particularly safe, the second evaluation device 15 can additionally have an evaluation input for the battery voltage U BAT . However, it could also be provided that the first evaluation device 14 controls the second evaluation device 15 accordingly. For this purpose, for example, the first evaluation device 14 could output a reset signal to the second evaluation unit 15 (represented by dashed lines) so that it cancels the fuel quantity limitation, ie the limited opening drive duration of the solenoid valve 5.

Wird der Kraftstoffversorgungsdruck -wie vorstehend erwähnt- reduziert, wird dies als Fehler von der Steuereinheit 2 erkannt. Eine entsprechende Meldung beziehungsweise Anzeige an den Benutzer des Kraftfahrzeugs kann ausgegeben werden. Die Fehlererkennung ist auch notwendig, da durch den reduzierten Kraftstoffversorgungsdruck das Abgasverhalten, insbesondere die Abgaszusammensetzung, der Brennkraftmaschine verändert sein kann.If the fuel supply pressure-as above mentioned, this is considered a mistake by the Control unit 2 detected. A corresponding message or display to the user of the motor vehicle can be issued. The error detection is also necessary because of the reduced Fuel supply pressure the exhaust behavior, in particular the exhaust gas composition, the internal combustion engine can be changed.

Claims (7)

  1. Method for controlling the fuel injection into an internal combustion engine by means of at least one solenoid valve which can be supplied from a power supply device and an element which stores electrical charge and can be recharged by means of the electromagnetic actuator of the solenoid valve, wherein at least one operating parameter of the internal combustion engine is detected, characterized in that this operating parameter is the voltage level (UBAT) of the power supply device (10), and in that the fuel supply pressure is reduced as a function of at least this voltage level (UBAT).
  2. Method according to Claim 1, characterized in that the fuel supply pressure is additionally reduced as a function of the rotational speed (n) of the internal combustion engine.
  3. Method according to Claim 1, characterized in that the quantity of fuel during the fuel injection is reduced in comparison with a set point quantity of fuel, assigned to the current operating situation of the internal combustion engine, as a function of at least the voltage level (UBAT) of the power supply device (10).
  4. Method according to Claim 3, characterized in that the quantity of fuel is limited as a function of the rotational speed (n) of the internal combustion engine and preferably the reduced fuel supply pressure.
  5. Method according to Claim 3, characterized in that the quantity of fuel is limited as a function of the voltage level (UBAT) of the power supply device (10) and preferably the rotational speed (n) of the internal combustion engine.
  6. Method according to one of Claims 3 to 5, characterized in that the quantity of fuel is limited by means of a shortened opening actuation period of the solenoid valve (5).
  7. Device for controlling the fuel injection into an internal combustion engine by means of at least one solenoid valve which can be supplied from a power supply device and an element which stores electrical charge, wherein the element can be recharged by means of the actuator, having a device for detecting at least one operating parameter of the internal combustion engine, characterized in that means (2, 9, 14) for reducing the fuel supply pressure as a function of the voltage level (UBAT) of the power supply device (10) are present.
EP01107985A 2000-05-11 2001-03-29 Method and apparatus for controlling fuel injection Expired - Lifetime EP1154142B1 (en)

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DE10022953A DE10022953A1 (en) 2000-05-11 2000-05-11 Method and device for controlling fuel injection

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DE10140157B4 (en) * 2001-08-16 2010-07-22 Robert Bosch Gmbh Method and device for driving a solenoid valve
DE102011078873A1 (en) * 2011-07-08 2013-01-10 Robert Bosch Gmbh Method for driving an electromagnetic consumer
CN115405433B (en) * 2022-09-29 2023-11-17 潍柴动力股份有限公司 Control method, device, equipment and medium for engine oil supply pressure

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JPS62142837A (en) * 1985-12-18 1987-06-26 Toyota Motor Corp Intake control device for internal combustion engine
US4982331A (en) * 1988-01-25 1991-01-01 Mitsubishi Denki Kabushiki Kaisha Fuel injector control apparatus
DE19539071A1 (en) * 1995-03-02 1996-09-05 Bosch Gmbh Robert Device for controlling at least one electromagnetic consumer
EP0812461B1 (en) * 1995-03-02 1999-05-06 Robert Bosch Gmbh Device for controlling at least one electromagnetic consumer
DE19536109A1 (en) * 1995-09-28 1997-04-03 Bosch Gmbh Robert Method and device for monitoring a fuel metering system
JP3223791B2 (en) * 1996-04-10 2001-10-29 トヨタ自動車株式会社 Fuel supply device for internal combustion engine
DE19731102C2 (en) * 1997-07-19 2003-02-06 Bosch Gmbh Robert System for operating a fuel supply system for an internal combustion engine, in particular a motor vehicle
DE19746980A1 (en) * 1997-10-24 1999-04-29 Bosch Gmbh Robert Method of driving electromagnetic load, esp. a fuel injection valve for an internal combustion engine
DE19813138A1 (en) * 1998-03-25 1999-09-30 Bosch Gmbh Robert Method and device for controlling an electromagnetic consumer
DE19853823A1 (en) * 1998-11-21 2000-05-25 Bosch Gmbh Robert Method of operating internal combustion engine, especially for motor vehicle, involves controlling fuel pump delivery rate depending on input parameters via characteristic field

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KR100771290B1 (en) 2007-10-29
JP2002004923A (en) 2002-01-09
EP1154142A3 (en) 2003-04-23
KR20010104663A (en) 2001-11-26
EP1154142A2 (en) 2001-11-14
DE50106367D1 (en) 2005-07-07

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