EP1129279B1 - Method for determining the controller output for controlling fuel injection engines - Google Patents
Method for determining the controller output for controlling fuel injection engines Download PDFInfo
- Publication number
- EP1129279B1 EP1129279B1 EP99960845A EP99960845A EP1129279B1 EP 1129279 B1 EP1129279 B1 EP 1129279B1 EP 99960845 A EP99960845 A EP 99960845A EP 99960845 A EP99960845 A EP 99960845A EP 1129279 B1 EP1129279 B1 EP 1129279B1
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- Prior art keywords
- torque
- determined
- lambda
- lambda value
- air
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Classifications
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- 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
- F02D41/02—Circuit arrangements for generating control signals
- F02D41/14—Introducing closed-loop corrections
- F02D41/1438—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor
- F02D41/1473—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the regulation method
- F02D41/1475—Regulating the air fuel ratio at a value other than stoichiometry
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- 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
- F02D2041/389—Controlling fuel injection of the high pressure type for injecting directly into the cylinder
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- 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
- F02D2250/18—Control of the engine output torque
Definitions
- the invention relates to the setting of a desired Motor torque through appropriate calculation of the manipulated variables, especially for adjusting the air and fuel supply to the engine for an engine with direct petrol injection.
- WO 95/24550 describes a method for controlling the Drive power of a vehicle become known to one Specification of a setpoint for that of the spark-ignited Internal combustion engine torque is based.
- An inclusion of efficiency changes through the different interventions are not addressed.
- a The air / fuel ratio is changing at underlying intake manifold-injection internal combustion engine only possible within narrow limits, within which one reliable ignition of the mixture and compliance specified exhaust gas values is possible.
- An important operating mode of an internal combustion engine with Direct petrol injection is the approximation unthrottled operation with high excess air, which at an intake manifold-injection engine is possible.
- the air mass in the combustion chamber is in operation high excess air then largely constant and Air ratio lambda as a measure of the composition of the Fuel / air mixture is injected by the Determined fuel mass.
- the air mass in the combustion chamber determined in connection with the air ratio lambda and the Speed n that applied by the internal combustion engine Torque. With a high excess of air, this can be done desired torque largely via a variation of the Set the fuel quantity.
- the combustibility of the mixture with a high excess of air is thereby spatially inhomogeneous mixture distribution in the combustion chamber reached.
- This Operating mode is also called shift operation. From that a distinction is made between the operation with homogeneous Mixture distribution with little or no excess air.
- the invention relates to determining the manipulated variable from the required moment in shift operation.
- the object of the invention is to avoid the undesirable Torque changes.
- the determination of the manipulated variable is advantageous Injection time by determining the manipulated variable Air supply supplemented.
- Fig. 1 shows the technical environment of the invention.
- Fig. 2 discloses an embodiment of the invention in the form of functional blocks and
- Fig. 3 represents the formation of the Restriction of air supply.
- the 1 in FIG. 1 represents the combustion chamber of a Cylinder of an internal combustion engine. Via an inlet valve 2 the inflow of air to the combustion chamber is controlled. The air is sucked in through a suction pipe 3. The intake air volume can can be varied via a throttle valve 4 by a Control unit 5 is controlled.
- the control unit Signals about the driver's torque request, e.g. via the position of an accelerator pedal 6, a signal on the Engine speed n from a speed sensor 7 and a signal about the amount ml of air drawn in by one Air flow meter 8 supplied.
- Input signals via further parameters of the Internal combustion engine such as intake air and coolant temperature USW forms the control unit 5 output signals for adjustment that of the throttle valve angle alpha by an actuator 9 and to control a fuel injection valve 10, dosed by the fuel into the combustion chamber of the engine becomes.
- the throttle valve angle alpha and Injection pulse width ti are within the scope of the invention essential, coordinated manipulated variables for Realization of the desired moment considered.
- the control unit controls an exhaust gas recirculation 11 Tank ventilation 12 and other functions such as the ignition of the fuel / air mixture in the combustion chamber.
- the one from the Combustion gas force is generated by pistons 13 and Crank drive 14 converted into a torque.
- FIG. 2 shows an embodiment of the invention.
- block 2.1 represents a map, which is determined by the speed n and the relative air filling rl is addressed.
- the relative Air filling is with a maximum filling of the combustion chamber Air related and so to speak gives the fraction of the maximum combustion chamber or cylinder filling. It will be in essentially formed from the signal ml.
- the from measurands Define the relative filling rl and the speed n an operating point of the engine. With the map 2.1 different operating points assigned torques that the engine under standard conditions in the different Operating points generated.
- Standard conditions can be determined by certain values of Influencing variables such as ignition angle, air ratio lambda, EGR rate, Define the tank ventilation status etc.
- lambda is equal to 1.
- the standard condition regarding the ignition angle can be Define the ignition angle at which the maximum possible Moment.
- an efficiency eta define as the ratio of the moment under standard conditions at the moment when isolated change of the Sets the influencing variable.
- desired torque / standard torque product of Efficiencies.
- the division of the driver request, for example dependent desired or target torque by the for the individual operating point of certain standard torque in the block 2.2 therefore delivers the product of all efficiencies.
- the values of the influencing variables such as EGR rate, ignition angle USW are in the control unit.
- EGR rate e.g., EGR rate
- ignition angle USW e.g., ignition angle USW
- stored Characteristic curves determine the associated efficiencies. It follows the formation of the product's efficiencies known influencing factors. These are all influencing factors except Lambda.
- the lambda efficiency etalam The associated lambda is determined via a characteristic curve access.
- the characteristic curve eta from Lambda gives for different Lambda values the ratio of the standard torque for lambda equal to one at the moment for other lambda values.
- Block 2.4 thus provides exactly the lambda value that is in the Combustion chamber must be set to the current, through which Air filling rl and speed n defined operating point the known other influencing variables such as ignition timing, EGR rate etc. to induce the desired moment. there means inducing the generation of gas force here Piston and crank mechanism deliver the desired torque.
- This target lambda value determines in conjunction with the Air filling rl of the combustion chamber derived from measured variables Amount of fuel needed to generate the desired moment must be injected.
- This embodiment allows adjustment of the Desired torque in largely dethrottled Shift operation of the engine.
- Fig. 3 enables the appropriate Adjustment of fuel and air supply to the engine for Realization of a given engine torque under Taking into account a maximum permissible value for the Air ratio lambda.
- the air filling can, for example, in systems with electronic controlled throttle valve (EGAS) via the Throttle valve opening angle set as manipulated variable become.
- EGAS electronic controlled throttle valve
- This manipulated variable is calculated in so-called air path.
- the fuel mass is determined, for example, by varying a Injection pulse width set as manipulated variable.
- the This manipulated variable is calculated as above was shown in the so-called fuel path.
- Air path the cylinder charge is limited to a value which results from the maximum permissible lambda for the the desired moment.
- Fig. 3 In block 3.1, the maximum permissible value Lambda Lambda _ perm is determined first, the example of the speed n may be dependent and therefore for example can be determined from a characteristic curve...
- the maximum permissible lambda becomes the associated lambda efficiency etalam determined.
- This product complies as shown above the ratio of the desired or actual moment to that Moment under standard conditions. With this from a maximum permissible lambda value corresponds to the outgoing consideration this actual moment is the moment that is at the maximum permissible lambda. This is the maximum allowed The actual torque to be assigned to the lambda value is indicated in block 3.4 Linking the product's efficiencies with that of Block 3.5 provided standard torque generated.
- This air filling rl thus represents the upper filling limit below which the desired moment can be seen only Interventions in the fuel path can be realized.
- This filling limit can be limited by a Throttle valve opening angle to a maximum value Realize alpha_max in block 3.7.
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- 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)
- Control Of Throttle Valves Provided In The Intake System Or In The Exhaust System (AREA)
Abstract
Description
Die Erfindung betrifft die Einstellung eines gewünschten Motormomentes durch passende Berechnung der Stellgrößen, insbesondere zur Einstellung der Luft- und Kraftstoffzufuhr zum Motor bei einem Motor mit Benzindirekteinspritzung.The invention relates to the setting of a desired Motor torque through appropriate calculation of the manipulated variables, especially for adjusting the air and fuel supply to the engine for an engine with direct petrol injection.
Aus der WO 95/24550 ist ein Verfahren zur Steuerung der Antriebsleistung eines Fahrzeugs bekannt geworden, dem eine Vorgabe eines Sollwerts für das von der fremdgezündeten Brennkraftmaschine abzugebende Drehmoment zugrunde liegt. Neben der Beeinflussung des Zündwinkels ist insbesondere eine Variation des Kraftstoff-/Luft-Verhältnisses zur Realisierung einer schnellen Momentenänderung vorhanden. Eine Einbeziehung von Wirkungsgradänderungen durch die unterschiedlichen Eingriffe ist nicht angesprochen. Eine Änderung des Kraftstoff-/Luft-Verhältnisses ist bei der zugrunde gelegten saugrohreinspritzenden Brennkraftmaschine nur innerhalb enger Grenzen möglich, innerhalb derer eine zuverlässige Entflammung des Gemisches und das Einhalten vorgegebener Abgaswerte möglich ist. WO 95/24550 describes a method for controlling the Drive power of a vehicle become known to one Specification of a setpoint for that of the spark-ignited Internal combustion engine torque is based. In addition to influencing the ignition angle is particularly a variation of the air / fuel ratio to Realization of a quick change of torque available. An inclusion of efficiency changes through the different interventions are not addressed. A The air / fuel ratio is changing at underlying intake manifold-injection internal combustion engine only possible within narrow limits, within which one reliable ignition of the mixture and compliance specified exhaust gas values is possible.
Eine wichtige Betriebsart einer Brennkraftmaschine mit Benzindirekteinspritzung ist der näherungsweise ungedrosselte Betrieb mit hohem Luftüberschuss, der bei einer saugrohreinspritzenden Brennkraftmaschine nicht möglich ist. Die Luftmasse im Brennraum ist beim Betrieb mit hohem Luftüberschuss dann weitgehend konstant und die Luftzahl Lambda als Maß für die Zusammensetzung des Kraftstoff-/Luft-Gemisches wird durch die eingespritzte Kraftstoffmasse bestimmt. Die Luftmasse im Brennraum bestimmt in Verbindung mit der Luftzahl Lambda und der Drehzahl n das von der Brennkraftmaschine aufgebrachte Drehmoment. Bei hohem Luftüberschuss läßt sich das gewünschte Drehmoment weitgehend über eine Variation der Kraftstoffmenge einstellen. Die Brennfähigkeit des Gemisches mit hohem Luftüberschuss wird dabei durch eine räumlich inhomogene Gemischverteilung im Brennraum erreicht. Diese Betriebsart wird auch als Schichtbetrieb bezeichnet. Davon zu unterscheiden ist der Betrieb mit homogener Gemischverteilung ohne oder mit geringerem Luftüberschuß. Die Erfindung betrifft die Stellgrößenbestimmung abhängig vom geforderten Moment im Schichtbetrieb.An important operating mode of an internal combustion engine with Direct petrol injection is the approximation unthrottled operation with high excess air, which at an intake manifold-injection engine is possible. The air mass in the combustion chamber is in operation high excess air then largely constant and Air ratio lambda as a measure of the composition of the Fuel / air mixture is injected by the Determined fuel mass. The air mass in the combustion chamber determined in connection with the air ratio lambda and the Speed n that applied by the internal combustion engine Torque. With a high excess of air, this can be done desired torque largely via a variation of the Set the fuel quantity. The combustibility of the mixture with a high excess of air is thereby spatially inhomogeneous mixture distribution in the combustion chamber reached. This Operating mode is also called shift operation. From that a distinction is made between the operation with homogeneous Mixture distribution with little or no excess air. The invention relates to determining the manipulated variable from the required moment in shift operation.
Externe Anforderungen an den Saugrohrdruck im Schichtbetrieb beeinflussen die Luftfüliung. Solche Anforderungen ergeben sich bspw. daraus, daß die Abgasrückführung und die Tankentlüftung ein gewisses Druckgefälle fordern. Die Forderung, die den niedrigsten Saugrohrdruck hervorruft, wird durch eine Minimalauswahl und Eingriff in die Drosselklappenstellung realisiert.External requirements for the intake manifold pressure in shift operation affect the air filling. Such requirements result for example from the fact that the exhaust gas recirculation and Tank ventilation require a certain pressure drop. The Requirement that causes the lowest intake manifold pressure is achieved through a minimal selection and intervention in the Throttle valve position realized.
Läßt man die für ein gewünschtes Drehmoment bestimmte einzuspritzende Kraftstoffmenge unverändert, ändert sich die Luftzahl. Dies hat unerwünschte Drehmomentänderungen zur Folge.Leaving the one determined for a desired torque fuel quantity to be injected unchanged, the Air ratio. This has undesirable torque changes Episode.
Aufgabe der Erfindung ist die Vermeidung der unerwünschten Drehmomentänderungen.The object of the invention is to avoid the undesirable Torque changes.
Diese Aufgabe wird mit den Merkmalen des Anspruchs 1 gelöst.This object is achieved with the features of claim 1.
Vorteilhafterweise wird die Bestimmung der Stellgröße Einspritzzeit noch durch eine Bestimmung der Stellgröße der Luftzufuhr ergänzt.The determination of the manipulated variable is advantageous Injection time by determining the manipulated variable Air supply supplemented.
Damit wird die weitere Aufgabe gelöst, eine passende Einstellung von Kraftstoff- und Luftzufuhr zum Motor zur Realisierung eines vorgegebenen Motormomentes unter Berücksichtigung eines maximal zulässigen Wertes für die Luftzahl Lambda.This solves the further task, a suitable one Adjustment of fuel and air supply to the engine for Realization of a given engine torque under Taking into account a maximum permissible value for the Air ratio lambda.
Diese weitere Aufgabe wird durch eine ergänzende Beschränkung der Luftzufuhr auf maximale Werte gelöst. Diese Beschränkung gewährleistet die reproduzierbare Einstellung kleiner Drehmomente über eine Variation der Einspritzimpulsbreiten. Ohne diese Beschränkung könnte es zur unerwünschten Einstellung zu magerer Gemische kommen, was Probleme bei der Brennbarkeit des Gemisches und/oder den Abgasemissionen mit sich bringen könnte.This additional task is complemented by a Restricted air supply to maximum values solved. This Restriction ensures the reproducible setting small torques over a variation of the Injection pulse widths. Without this limitation, it could come to the undesired attitude to lean mixtures, what problems with the flammability of the mixture and / or could result in exhaust emissions.
Im folgenden wird ein Ausführungsbeispiel der Erfindung mit Bezug auf die Figuren erläutert.The following is an embodiment of the invention Explained with reference to the figures.
Fig. 1 zeigt das technische Umfeld der Erfindung. Fig. 2 offenbart ein Ausführungsbeispiel der Erfindung in der Form von Funktionsblöcken und Fig. 3 stellt die Bildung der Beschränkung der Luftzufuhr dar.Fig. 1 shows the technical environment of the invention. Fig. 2 discloses an embodiment of the invention in the form of functional blocks and Fig. 3 represents the formation of the Restriction of air supply.
Die 1 in der Fig. 1 repräsentiert den Brennraum eines
Zylinders eines Verbrennungsmotors. Über ein Einlaßventil 2
wird der Zustrom von Luft zum Brennraum gesteuert. Die Luft
wird über ein Saugrohr 3 angesaugt. Die Ansaugluftmenge kann
über eine Drosselklappe 4 variiert werden, die von einem
Steuergerät 5 angesteuert wird. Dem Steuergerät werden
Signale über den Drehmomentwunsch des Fahrers, bspw. über
die Stellung eines Fahrpedals 6, ein Signal über die
Motordrehzahl n von einem Drehzahlgeber 7 und ein Signal
über die Menge ml der angesaugten Luft von einem
Luftmengenmesser 8 zugeführt. Aus diesen und ggf. weiteren
Eingangssignalen über weitere Parameter des
Verbrennungsmotors wie Ansaugluft- und Kühlmitteltemperatur
USW bildet das Steuergerät 5 Ausgangssignale zur Einstellung
der des Drosselklappenwinkels alpha durch ein Stellglied 9
und zur Ansteuerung eines Kraftstoffeinspritzventils 10,
durch das Kraftstoff in den Brennraum des Motors dosiert
wird. Der Drosselklappenwinkel alpha und die
Einspritzimpulsbreite ti werden im Rahmen der Erfindung als
wesentliche, aufeinander abzustimmende Stellgrößen zur
Realisierung des Wunschmomentes betrachtet. Weiterhin
steuert das Steuergerät ggf. eine Abgasrückführung 11, eine
Tankentlüftung 12 sowie weitere Funktionen wie die Zündung
des Kraftstoff/Luftgemisches im Brennraum. Die aus der
Verbrennung resultierende Gaskraft wird durch Kolben 13 und
Kurbeltrieb 14 in ein Drehmoment gewandelt.The 1 in FIG. 1 represents the combustion chamber of a
Cylinder of an internal combustion engine. Via an inlet valve 2
the inflow of air to the combustion chamber is controlled. The air
is sucked in through a suction pipe 3. The intake air volume can
can be varied via a throttle valve 4 by a
Control unit 5 is controlled. The control unit
Signals about the driver's torque request, e.g. via
the position of an accelerator pedal 6, a signal on the
Engine speed n from a speed sensor 7 and a signal
about the amount ml of air drawn in by one
Air flow meter 8 supplied. From these and possibly others
Input signals via further parameters of the
Internal combustion engine such as intake air and coolant temperature
USW forms the control unit 5 output signals for adjustment
that of the throttle valve angle alpha by an actuator 9
and to control a
FIG. 2 zeigt ein Ausführungsbeispiel der Erfindung. Block 2.1 stellt ein Kennfeld dar, das durch die Drehzahl n und die relative Luftfüllung rl adressiert wird. Die relative Luftfüllung ist auf eine maximale Füllung des Brennraums mit Luft bezogen und gibt damit gewissermaßen den Bruchteil der maximalen Brennraum- oder Zylinderfüllung an. Sie wird im wesentlichen aus dem Signal ml gebildet. Die aus Meßgrößen gebildete relative Füllung rl und die Drehzahl n definieren einen Betriebspunkt des Motors. Mit dem Kennfeld 2.1 werden verschiedenen Betriebspunkten Drehmomente zugeordnet, die der Motor unter Normbedingungen in den verschiedenen Betriebspunkten erzeugt.FIG. 2 shows an embodiment of the invention. block 2.1 represents a map, which is determined by the speed n and the relative air filling rl is addressed. The relative Air filling is with a maximum filling of the combustion chamber Air related and so to speak gives the fraction of the maximum combustion chamber or cylinder filling. It will be in essentially formed from the signal ml. The from measurands Define the relative filling rl and the speed n an operating point of the engine. With the map 2.1 different operating points assigned torques that the engine under standard conditions in the different Operating points generated.
Normbedingungen lassen sich durch bestimmte Werte von Einflußgrößen wie Zündwinkel, Luftzahl Lambda, AGR-Rate, Tankentlüftungszustand usw. festlegen. Als Normbedingung bezüglich der Luftzahl kommt Lambda gleich 1 in Frage. Als Normbedingung bezüglich des Zündwinkels läßt sich der Zündwinkel definieren, bei dem sich das maximal mögliche Moment einstellt.Standard conditions can be determined by certain values of Influencing variables such as ignition angle, air ratio lambda, EGR rate, Define the tank ventilation status etc. As a standard requirement with regard to the air ratio, lambda is equal to 1. As The standard condition regarding the ignition angle can be Define the ignition angle at which the maximum possible Moment.
Bezüglich jeder Einflußgröße läßt sich ein Wirkungsgrad eta definieren als Verhältnis vom Moment unter Normbedingungen zu dem Moment, das sich bei isolierter Änderung der Einflußgröße einstellt.With regard to each influencing variable, an efficiency eta define as the ratio of the moment under standard conditions at the moment when isolated change of the Sets the influencing variable.
Bei Abweichungen mehrerer Einflußgrößen von ihren Normwerten gibt das Produkt der Wirkungsgrade das Verhältnis des Normmomentes bei den Normwerten der Einflußgrößen zu dem Moment bei den abweichenden Einflußgrößen an.If several influencing variables deviate from their standard values gives the product of the efficiencies the ratio of the Norm moment at the norm values of the influencing variables to the Moment at the different influencing variables.
Mit anderen Worten: Wunschmoment/Normmoment = Produkt der Wirkungsgrade. Die Division des bspw. vom Fahrerwunsch abhängigen Wunsch- oder Sollmomentes durch das für den individuellen Betriebspunkt bestimmten Normmomentes im Block 2.2 liefert daher das Produkt sämtlicher Wirkungsgrade.In other words: desired torque / standard torque = product of Efficiencies. The division of the driver request, for example dependent desired or target torque by the for the individual operating point of certain standard torque in the block 2.2 therefore delivers the product of all efficiencies.
Die Werte der Einflußgrößen wie AGR-Rate, Zündwinkel USW liegen im Steuergerät vor. Bspw. mit Hilfe abgespeicherter Kennlinien werden die zugehörigen Wirkungsgrade bestimmt. Es folgt die Bildung des Produktes der Wirkungsgrade der bekannten Einflußgrößen. Dies sind alle Einflußgrößen außer Lambda.The values of the influencing variables such as EGR rate, ignition angle USW are in the control unit. For example. with the help of stored Characteristic curves determine the associated efficiencies. It follows the formation of the product's efficiencies known influencing factors. These are all influencing factors except Lambda.
Die Division des Produktes sämtlicher Wirkungsgrade durch das Produkt der Wirkungsgrade der bekannten Einflußgrößen im Block 2.3 liefert den Lambdawirkungsgrad etalam.The division of the product by all efficiencies the product of the efficiencies of the known influencing factors in Block 2.3 provides the lambda efficiency etalam.
Aus dem Lambdawirkungsgrad etalam wird im Block 2.4 bspw. über einen Kennlinienzugriff das zugehörige Lambda bestimmt.In block 2.4, for example, the lambda efficiency etalam The associated lambda is determined via a characteristic curve access.
Die Kennlinie eta von Lambda gibt für verschiedene Lambdawerte das Verhältnis des Normmomentes bei Lambda gleich Eins zu dem Moment bei anderen Lambdawerten an.The characteristic curve eta from Lambda gives for different Lambda values the ratio of the standard torque for lambda equal to one at the moment for other lambda values.
Block 2.4 liefert damit genau den Lambdawert dar, der im Brennraum eingestellt werden muß, um im aktuellen, durch die Luftfüllung rl und Drehzahl n definierten Betriebspunkt bei den bekannten übrigen Einflußgrößen wie Zündzeitpunkt, AGR-Rate usw. das gewünschte Moment zu induzieren. Dabei bedeutet Induzieren hier das Erzeugen der Gaskraft, die über Kolben und Kurbeltrieb das Wunschmoment liefert. Block 2.4 thus provides exactly the lambda value that is in the Combustion chamber must be set to the current, through which Air filling rl and speed n defined operating point the known other influencing variables such as ignition timing, EGR rate etc. to induce the desired moment. there means inducing the generation of gas force here Piston and crank mechanism deliver the desired torque.
Dieser Soll-Lambdawert determiniert in Verbindung mit der aus Meßgrößen abgeleiteten Luftfüllung rl des Brennraums die Kraftstoffmenge, die zur Erzeugung des gewünschten Momentes eingespritzt werden muß.This target lambda value determines in conjunction with the Air filling rl of the combustion chamber derived from measured variables Amount of fuel needed to generate the desired moment must be injected.
Daraus läßt sich durch Division von rl durch den wunschmomentabhängig bestimmten Lambdasollwert im Block 2.5 eine relative Kraftstoffmasse bestimmen, die dann in die konkrete Einspritzimpulsbreite als Stellgröße im Kraftstoffpfad umgerechnet wird.This can be done by dividing rl by the Lambda setpoint determined as a function of the desired torque in block 2.5 determine a relative fuel mass, which is then in the concrete injection pulse width as manipulated variable in Fuel path is converted.
Dieses Ausführungsbeispiel ermöglicht eine Einstellung des Wunschdrehmomentes im weitgehend entdrosselten Schichtbetrieb des Motors.This embodiment allows adjustment of the Desired torque in largely dethrottled Shift operation of the engine.
Die in Fig. 3 dargestellte Ergänzung ermöglicht die passende Einstellung von Kraftstoff- und Luftzufuhr zum Motor zur Realisierung eines vorgegebenen Motormomentes unter Berücksichtigung eines maximal zulässigen Wertes für die Luftzahl Lambda.The addition shown in Fig. 3 enables the appropriate Adjustment of fuel and air supply to the engine for Realization of a given engine torque under Taking into account a maximum permissible value for the Air ratio lambda.
Ohne die letztere Bedingung könnte es zur unerwünschten Einstellung zu magerer Gemische kommen, was Probleme bei der Brennbarkeit des Gemisches und/oder den Abgasemissionen mit sich bringen könnte.Without the latter condition, it could become undesirable Attitudes to lean mixtures come what problems with the combustibility of the mixture and / or the exhaust gas emissions could bring with it.
Dies deshalb, weil das Moment bei festem Lambda mit zunehmender Zylinderfüllung steigt. Wird variables Lambda zugelassen, ergibt sich bei fester Füllung eine gewisse Bandbreite einstellbarer Momente. Dabei wird die Bandbreite durch Lambdagrenzwerte vorgegeben, außerhalb derer beispielsweise die Brennbarkeit nicht gewährleistet ist.This is because the moment with a fixed lambda increasing cylinder filling increases. Becomes variable lambda permitted, there is a certain amount with a solid filling Range of adjustable moments. The bandwidth specified by lambda limit values, outside of which for example, the flammability is not guaranteed.
Es gibt daher zu jeder Füllung ein minimales Moment. Werden kleinere Momente gewünscht, kann dies nicht mehr allein über einen Eingriff auf den Kraftstoffpfad realisiert werden. Vielmehr ist dann eine Reduzierung der Füllung zwingend erforderlich.There is therefore a minimal moment for every filling. Become Wanted smaller moments, this can no longer be done alone an intervention on the fuel path can be realized. Rather, a reduction in the filling is imperative required.
Dazu werden erfindungsgemäß im Schichtbetrieb für ein bestimmtes vorgegebenes Sollmoment unter Berücksichtigung eines maximal zulässigen Lambdawertes die passende Luftfüllung und Kraftstoffmasse eingestellt, die dieses vorgegebene Sollmoment liefern.For this purpose, according to the invention, in shift operation for a certain predetermined target torque taking into account the maximum permissible lambda value Air charge and fuel mass set this deliver the specified target torque.
Die Luftfüllung kann bspw. bei Systemen mit elektronisch gesteuerter Drosselklappe (EGAS) über den Drosselklappenöffnungswinkel als Stellgröße eingestellt werden. Die Berechnung dieser Stellgröße erfolgt im sogenannten Luftpfad.The air filling can, for example, in systems with electronic controlled throttle valve (EGAS) via the Throttle valve opening angle set as manipulated variable become. This manipulated variable is calculated in so-called air path.
Die Kraftstoffmasse wird bspw. über die Variation einer Einspritzimpulsbreite als Stellgröße eingestellt. Die Berechnung dieser Stellgröße erfolgt wie weiter oben dargestellt wurde, im sogenannten Kraftstoffpfad.The fuel mass is determined, for example, by varying a Injection pulse width set as manipulated variable. The This manipulated variable is calculated as above was shown in the so-called fuel path.
Die eigentliche Einstellung des Motormomentes geschieht wie beschrieben mit Hilfe des Kraftstoffpfades.The actual setting of the engine torque happens like described using the fuel path.
Im Luftpfad findet ergänzend eine Begrenzung der Füllung auf Werte statt, die Momenten entsprechen, die über die Kraftstoffzufuhr einstellbar sind. Mit anderen Worten: Im Luftpfad wird die Zylinderfüllung auf einen Wert begrenzt, der sich aus dem maximal zulässigen Lambda für das gewünschte Moment ergibt.A limitation of the filling is also found in the air path Instead of values that correspond to moments beyond the Fuel supply are adjustable. In other words: Air path, the cylinder charge is limited to a value which results from the maximum permissible lambda for the the desired moment.
Dies ist in Fig. 3 dargestellt: Im Block 3.1 wird zunächst der maximal zulässige Lambdawert Lambda_zul ermittelt, der bspw. von der Drehzahl n abhängig sein kann und der daher bspw. aus einer Kennlinie ermittelbar ist. This is illustrated in Fig. 3: In block 3.1, the maximum permissible value Lambda Lambda _ perm is determined first, the example of the speed n may be dependent and therefore for example can be determined from a characteristic curve...
Aus diesem maximal zulässigen Lambda wird im Block 3.2 der zugehörige Lambdawirkungsgrad etalam bestimmt.In block 3.2, the maximum permissible lambda becomes the associated lambda efficiency etalam determined.
Bei bekannten übrigen Einflußgrößen ist damit das Produkt aller Wirkungsgrade für das maximal zulässige Lambda im Block 3.3 bestimmbar.With known other influencing variables, the product is thus all efficiencies for the maximum permissible lambda in Block 3.3 can be determined.
Dieses Produkt entspricht, wie weiter oben dargestellt wurde, dem Verhältnis von Wunsch- bzw. Ist-Moment zu dem Moment unter Normbedingungen. Bei dieser von einem maximal zulässigen Lambdawert ausgehenden Betrachtung entspricht dieses Ist-Moment dem Moment, das sich bei dem maximal zulässigen Lambda einstellt. Dieses dem maximal zulässigen Lambdawert zuzuordnende Istmoment wird im Block 3.4 durch Verknüpfung des Produktes der Wirkungsgrade mit dem durch Block 3.5 bereitgestellten Normmoment erzeugt.This product complies as shown above the ratio of the desired or actual moment to that Moment under standard conditions. With this from a maximum permissible lambda value corresponds to the outgoing consideration this actual moment is the moment that is at the maximum permissible lambda. This is the maximum allowed The actual torque to be assigned to the lambda value is indicated in block 3.4 Linking the product's efficiencies with that of Block 3.5 provided standard torque generated.
Diesem speziellen Ist-Moment läßt sich durch Kennlinienzugriff im Block 3.6 eine maximale Zylinderfüllung rl = f(Lambda_zul) eindeutig zuordnen, bei der sich dieses Moment unter der Annahme eines maximalen Lambda, d.h. einem Lambda an der Magerlaufgrenze zwischen gerade noch brennfähigen und gerade nicht mehr brennfähigen Gemischen, einstellt.This special actual moment can be passed through Characteristic curve access in block 3.6 a maximum cylinder charge rl = f (Lambda_zul) clearly assign, at which this Moment assuming a maximum lambda, i.e. one Lambda at the lean running limit just between flammable and no longer flammable mixtures, established.
Diese Luftfüllung rl stellt damit die obere Füllungsgrenze dar, unterhalb derer sich das Wunschmoment allein durch Eingriffe in den Kraftstoffpfad realisieren läßt.This air filling rl thus represents the upper filling limit below which the desired moment can be seen only Interventions in the fuel path can be realized.
Diese Füllungsgrenze läßt sich durch eine Begrenzung des Öffnungswinkels der Drosselklappe auf einen maximalen Wert alpha_max im Block 3.7 realisieren.This filling limit can be limited by a Throttle valve opening angle to a maximum value Realize alpha_max in block 3.7.
Claims (2)
- Method for setting the torque in an internal combustion engine having the steps:a setpoint torque is determined,an operating point is determined from measured values for the air charge and rotational speed,a standard torque for this operating point is determined,a setpoint efficiency is determined from the standard torque and setpoint torque,the lambda value associated with this efficiency is determined,the quantity of fuel is determined from the associated lambda value and the air charge which is derived from measurement variables and, in conjunction with the air charge, yields the associated lambda value for implementing the setpoint torque.
- Method according to Claim 1, characterized by the further steps:the maximum acceptable lambda value for the normal combustion is determined,the associated lambda efficiency is determined,the overall efficiency is determined as a product of all the efficiency levels of the other known influencing variables for the maximum acceptable lambda value,the actual torque which is obtained at the maximum acceptable lambda value and the efficiency level is determined taking into account the standard torque,a maximum cylinder charge rl for this actual torque, with which cylinder charge rl this actual torque is obtained assuming a maximum lambda value, is determined,a maximum throttle valve angle alpha_max is determined in order to restrict the charge.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19851990 | 1998-11-03 | ||
| DE19851990A DE19851990A1 (en) | 1998-11-03 | 1998-11-03 | Process for determining manipulated variables in the control of gasoline direct injection engines |
| PCT/DE1999/003479 WO2000026522A1 (en) | 1998-11-03 | 1999-11-02 | Method for determining the controller output for controlling fuel injection engines |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP1129279A1 EP1129279A1 (en) | 2001-09-05 |
| EP1129279B1 true EP1129279B1 (en) | 2003-03-05 |
Family
ID=7887423
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP99960845A Expired - Lifetime EP1129279B1 (en) | 1998-11-03 | 1999-11-02 | Method for determining the controller output for controlling fuel injection engines |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US6512983B1 (en) |
| EP (1) | EP1129279B1 (en) |
| JP (1) | JP2003502540A (en) |
| DE (2) | DE19851990A1 (en) |
| WO (1) | WO2000026522A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1469179A1 (en) * | 2003-04-16 | 2004-10-20 | Robert Bosch Gmbh | Method and device for controlling an internal combustion engine |
Families Citing this family (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10000918A1 (en) * | 2000-01-12 | 2001-07-19 | Volkswagen Ag | Controling internal combustion engine involves correcting normal fuel quantity for relative efficiency derived from engine operating conditions to determine required fuel quantity |
| DE10040251A1 (en) * | 2000-08-14 | 2002-03-07 | Bosch Gmbh Robert | Method, computer program and control and / or regulating device for operating an internal combustion engine |
| DE10043375A1 (en) | 2000-09-02 | 2002-03-14 | Bosch Gmbh Robert | Process for heating a catalytic converter in internal combustion engines with gasoline direct injection |
| DE10043699A1 (en) | 2000-09-04 | 2002-03-14 | Bosch Gmbh Robert | Method for determining the fuel content of the regeneration gas in an internal combustion engine with gasoline direct injection in shift operation |
| DE10043690A1 (en) * | 2000-09-04 | 2002-03-14 | Bosch Gmbh Robert | Procedure for NOx mass flow determination from map data with variable air intake and engine temperature |
| DE10043859A1 (en) | 2000-09-04 | 2002-03-14 | Bosch Gmbh Robert | Method of diagnosing mixture formation |
| DE10043687A1 (en) | 2000-09-04 | 2002-03-14 | Bosch Gmbh Robert | Coordination of various exhaust gas temperature requirements and appropriate heating or cooling measures |
| DE10100682A1 (en) * | 2001-01-09 | 2002-07-11 | Bosch Gmbh Robert | Process for heating a catalytic converter in internal combustion engines with gasoline direct injection |
| DE10255488A1 (en) | 2002-11-27 | 2004-06-09 | Robert Bosch Gmbh | Computer process and assembly to regulate the operation of an automotive diesel or petrol engine determines the difference between fuel consumption in two operating modes |
| DE102004054240B4 (en) * | 2004-11-10 | 2016-07-14 | Robert Bosch Gmbh | Method for operating an internal combustion engine |
| DE102006015264A1 (en) * | 2006-04-01 | 2007-10-04 | Bayerische Motoren Werke Ag | Method for controlling combustion engine for motor vehicle, requires ascertaining an actual Lambda value, and deviation of actual value, from desired value |
| JP4396748B2 (en) * | 2007-08-21 | 2010-01-13 | トヨタ自動車株式会社 | Control device for internal combustion engine |
| EP2570636B1 (en) * | 2010-05-13 | 2016-10-26 | Toyota Jidosha Kabushiki Kaisha | Control device for internal combustion engine |
| US10803213B2 (en) | 2018-11-09 | 2020-10-13 | Iocurrents, Inc. | Prediction, planning, and optimization of trip time, trip cost, and/or pollutant emission for a vehicle using machine learning |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4407475C2 (en) | 1994-03-07 | 2002-11-14 | Bosch Gmbh Robert | Method and device for controlling a vehicle |
| US5479898A (en) | 1994-07-05 | 1996-01-02 | Ford Motor Company | Method and apparatus for controlling engine torque |
| DE19618849B4 (en) * | 1996-05-10 | 2010-04-29 | Robert Bosch Gmbh | Method and device for controlling an internal combustion engine of a vehicle |
| US6273076B1 (en) * | 1997-12-16 | 2001-08-14 | Servojet Products International | Optimized lambda and compression temperature control for compression ignition engines |
| DE19850581C1 (en) * | 1998-11-03 | 2000-02-10 | Bosch Gmbh Robert | Torque measuring method for i.c. engine with direct diesel injection uses parameters representing engine operating point for addressing characteristic field providing maximum torque corrected by further engine operating parameters |
| DE19900740A1 (en) * | 1999-01-12 | 2000-07-13 | Bosch Gmbh Robert | Method and device for operating an internal combustion engine |
| US6308697B1 (en) * | 2000-03-17 | 2001-10-30 | Ford Global Technologies, Inc. | Method for improved air-fuel ratio control in engines |
-
1998
- 1998-11-03 DE DE19851990A patent/DE19851990A1/en not_active Withdrawn
-
1999
- 1999-11-02 WO PCT/DE1999/003479 patent/WO2000026522A1/en active IP Right Grant
- 1999-11-02 DE DE59904486T patent/DE59904486D1/en not_active Expired - Lifetime
- 1999-11-02 EP EP99960845A patent/EP1129279B1/en not_active Expired - Lifetime
- 1999-11-02 US US09/830,872 patent/US6512983B1/en not_active Expired - Fee Related
- 1999-11-02 JP JP2000579880A patent/JP2003502540A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1469179A1 (en) * | 2003-04-16 | 2004-10-20 | Robert Bosch Gmbh | Method and device for controlling an internal combustion engine |
Also Published As
| Publication number | Publication date |
|---|---|
| US6512983B1 (en) | 2003-01-28 |
| DE19851990A1 (en) | 2000-06-21 |
| EP1129279A1 (en) | 2001-09-05 |
| DE59904486D1 (en) | 2003-04-10 |
| WO2000026522A1 (en) | 2000-05-11 |
| WO2000026522A9 (en) | 2000-09-28 |
| JP2003502540A (en) | 2003-01-21 |
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