EP1132613A2 - Method for starting an internal combustion engine - Google Patents

Method for starting an internal combustion engine Download PDF

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Publication number
EP1132613A2
EP1132613A2 EP01104950A EP01104950A EP1132613A2 EP 1132613 A2 EP1132613 A2 EP 1132613A2 EP 01104950 A EP01104950 A EP 01104950A EP 01104950 A EP01104950 A EP 01104950A EP 1132613 A2 EP1132613 A2 EP 1132613A2
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EP
European Patent Office
Prior art keywords
internal combustion
combustion engine
speed
starting
starter
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Granted
Application number
EP01104950A
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German (de)
French (fr)
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EP1132613B1 (en
EP1132613A3 (en
Inventor
Udo Philippi
Achim Przymusinski
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Siemens AG
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Siemens AG
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Publication of EP1132613A3 publication Critical patent/EP1132613A3/en
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02N—STARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR
    • F02N99/00—Subject matter not provided for in other groups of this subclass
    • F02N99/002—Starting combustion engines by ignition means
    • F02N99/006—Providing a combustible mixture inside the cylinder
    • 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
    • F02D41/04—Introducing corrections for particular operating conditions
    • F02D41/06—Introducing corrections for particular operating conditions for engine starting or warming up
    • F02D41/061—Introducing corrections for particular operating conditions for engine starting or warming up the corrections being time dependent
    • 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
    • F02D41/04—Introducing corrections for particular operating conditions
    • F02D41/06—Introducing corrections for particular operating conditions for engine starting or warming up
    • F02D41/062—Introducing corrections for particular operating conditions for engine starting or warming up for starting
    • 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
    • F02D41/3827—Common rail control systems for diesel engines
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/30—Controlling fuel injection
    • F02D41/38—Controlling fuel injection of the high pressure type
    • F02D41/3809—Common rail control systems
    • F02D41/3836—Controlling the fuel pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D2200/00—Input parameters for engine control
    • F02D2200/02—Input parameters for engine control the parameters being related to the engine
    • F02D2200/06—Fuel or fuel supply system parameters
    • F02D2200/0602—Fuel pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • 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 starting an internal combustion engine, in their combustion chambers fuel from one Pressure accumulator is injected.
  • Fuel in an internal combustion engine in its combustion chambers is injected from a pressure accumulator, the Injection duration and the start of injection selected appropriately.
  • a known idle controller is usually used corresponding initialization values, which then independently in a known manner by acting on the manipulated variables Injection duration and start of injection the start process and regulates the subsequent idling.
  • the invention has for its object a method for Starting an internal combustion engine with fuel in its combustion chambers is injected from a pressure accumulator, to indicate with the at all temperatures, especially in low temperature ranges, improved starting behavior without having to measure the temperature.
  • the invention is based on the knowledge that for Starting behavior at low temperatures the viscosity of the Fuel is crucial for an injection amount of fuel introduced into the combustion chambers.
  • the viscosity of diesel fuel increases Fuel at low temperatures.
  • system repercussions by keeping the other injection parameters constant, in particular the control duration of the injection valves and the start of injection switched off. This can make a systematic Adjustment of the operating point of the injection valves under Other parameters determining the operating point are kept constant.
  • the manipulated variable of the binary controller used is the fuel pressure in the pressure accumulator, the monitored controlled variable is the speed behavior of the internal combustion engine, especially a speed gradient.
  • the timing of the starting process is in time series in Fig. 1 shown.
  • FIG. 2 shows the control circuit for operating point control in a block diagram of the injectors.
  • the internal combustion engine is designated with M.
  • N the speed N is monitored.
  • a default member P provides one Default value for the fuel pressure FUP, which is then at the Internal combustion engine M is set.
  • B On the internal combustion engine M further operating parameters B are set, in particular the activation period TI and the start of injection SOI for the injectors. Control of the internal combustion engine M with these parameters is from a not shown Spreading device taken over, in which also in Fig. 2nd shown control loop can be implemented as a program module can.
  • FUP is supplied by an integral member I. Value increased.
  • the integral element I receives at its input fed a period of time.
  • the engine is at the starter speed N_Starter driven.
  • the speed N remains of the internal combustion engine M on the starter speed N_Starter.
  • the internal combustion engine M produces no torque Speed does not increase.
  • the internal combustion engine M now generates for the first time a torque, the speed N begins to increase.
  • This Rise shows that the internal combustion engine M start begins.
  • the operating point of the injection is therefore one desired area in which a starting process take place can. Therefore the working point is kept by not only as before the other injection parameters, in particular the activation duration of the TI of the injection valves and the start of injection SOI, but also the fuel pressure FUP in the Pressure accumulator can be kept constant.
  • the working point is maintained until the internal combustion engine M at the time t3 reaches idle speed.
  • the internal combustion engine operated with the conventional idle control, in which the known variation of the control period TI Injectors and the start of injection SOI takes place. Further the fuel pressure FUP in the pressure accumulator to the for the idle value provided.
  • the controller working for starting the internal combustion engine takes a non-linear control of the working point accordingly that the fuel pressure FUP in the Pressure accumulator is used and the binary as control variable Differentiate whether the internal combustion engine has an induced torque applies, is used.
  • This controlled variable corresponds ultimately a binary signal that indicates whether a Fuel injection with combustion takes place. Because only then the speed N of the internal combustion engine M increases Internal combustion engine M shows a change in its speed N, can directly monitor the speed N or at its first time derivative can be recognized. It can therefore both the speed N as well as its first time derivative can be used as a control variable.
  • injection parameters are due to this compensation chosen so that for normal environmental conditions, i.e. a warm internal combustion engine M, are optimal.

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

Abstract

The method involves setting the fuel pressure (FUP) in a pressure reservoir to a starting value at the beginning of a starting process; starting the engine (M) with a starter revolution rate (N_Starter); determining the time in which the engine revolution rate (N) is held at the level of the starter revolution rate; and if a defined period is exceeded, increasing the pressure in the pressure reservoir until the engine indicates a defined increase in its revolution rate.

Description

Die Erfindung betrifft ein Verfahren zum Starten einer Brennkraftmaschine, in deren Brennräume Kraftstoff aus einem Druckspeicher eingespritzt wird.The invention relates to a method for starting an internal combustion engine, in their combustion chambers fuel from one Pressure accumulator is injected.

Zum Starten einer Brennkraftmaschine muss man eine bestimmte Mindestmenge an Kraftstoff in die Brennkammern einbringen. Bei einer Brennkraftmaschine in deren Brennräume Kraftstoff aus einem Druckspeicher eingespritzt wird, wird deshalb die Einspritzdauer und der Einspritzbeginn geeignet gewählt.To start an internal combustion engine you have to have a specific one Put the minimum amount of fuel into the combustion chambers. Fuel in an internal combustion engine in its combustion chambers is injected from a pressure accumulator, the Injection duration and the start of injection selected appropriately.

Man muss dabei der Tatsache Rechnung tragen, dass das Einspritzverhalten der Einspritzventile und die Viskosität des einzuspritzenden Kraftstoffes wesentlichen Einfluss auf die bei einer Einspritzung eingebrachte Kraftstoffmenge haben. Beide Größen sind temperaturabhängig. Deshalb ist es bekannt, die Startwerte für den Kraftstoffdruck und die Ansteuerdauer der Einspritzventile temperaturabhängig zu wählen, um bei allen Temperaturen sicherzustellen, dass eine ausreichende Kraftstoffmenge beim Start in die Brennräume eingespritzt wird. Auch ist es bekannt, durch entsprechende Ansteuerung der Einspritzventile die Kraftstoffmenge während eines Startvorganges zu steigern, um auf jeden Fall ein sicheres Startverhalten zu erreichen.You have to take into account the fact that the injection behavior of the injectors and the viscosity of the the fuel to be injected has a significant influence on the amount of fuel introduced during an injection. Both sizes are temperature dependent. That's why it's known the starting values for the fuel pressure and the activation duration to choose the injectors depending on the temperature, in order for all Temperatures ensure adequate Fuel quantity injected into the combustion chambers at start becomes. It is also known by appropriate control of the injection valves the amount of fuel during a starting process to increase in any case a safe starting behavior to reach.

Dabei wird üblicherweise ein bekannter Leerlaufregler mit entsprechenden Initialisierungswerten versehen, der dann selbständig auf bekannte Weise durch Wirkung auf die Stellgrößen Einspritzdauer und Einspritzbeginn den Startvorgang und den anschließenden Leerlauf regelt.A known idle controller is usually used corresponding initialization values, which then independently in a known manner by acting on the manipulated variables Injection duration and start of injection the start process and regulates the subsequent idling.

Dieses Vorgehen hat den Nachteil, dass nicht für alle Temperaturen, in denen die Brennkraftmaschine gestartet wird, ein optimales Startverhalten erreicht wird. Weiter ist eine Temperaturmessung vor dem Start unerlässlich.This procedure has the disadvantage that not for all temperatures, in which the internal combustion engine is started optimal starting behavior is achieved. Next is a temperature measurement essential before starting.

Der Erfindung liegt die Aufgabe zugrunde, ein Verfahren zum Starten einer Brennkraftmaschine, in deren Brennräume Kraftstoff aus einem Druckspeicher eingespritzt wird, anzugeben, mit dem bei allen Temperaturen, insbesondere in niederen Temperaturbereichen, ein verbessertes Startverhalten erreicht wird, ohne dass die Temperatur gemessen werden müsste.The invention has for its object a method for Starting an internal combustion engine with fuel in its combustion chambers is injected from a pressure accumulator, to indicate with the at all temperatures, especially in low temperature ranges, improved starting behavior without having to measure the temperature.

Diese Aufgabe wird durch die in Anspruch 1 gekennzeichnete Erfindung gelöst.This object is characterized by that in claim 1 Invention solved.

Die Erfindung geht von der Erkenntnis aus, dass für das Startverhalten bei niedrigen Temperaturen die Viskosität des Kraftstoffes ausschlaggebend für die bei einer Einspritzung in die Brennkammern eingebrachte Kraftstoffmenge ist. Insbesondere bei Dieselkraftstoff steigt die Zähflüssigkeit des Kraftstoffes bei niederen Temperaturen stark an. Zum Ausgleich der mit sinkender Temperatur zunehmenden Viskosität ist deshalb vorgesehen, den Kraftstoffdruck in dem Druckspeicher, aus dem heraus über Einspritzventile die Einspritzung in die Brennräume erfolgt, dann während des Startvorgangs anzuheben, wenn festgestellt wird, dass die Brennkraftmaschine nicht innerhalb einer gewissen Zeitdauer nach Beginn des Startvorganges, d.h. nach Erreichen der Anlasserdrehzahl startet.The invention is based on the knowledge that for Starting behavior at low temperatures the viscosity of the Fuel is crucial for an injection amount of fuel introduced into the combustion chambers. In particular the viscosity of diesel fuel increases Fuel at low temperatures. To compensate the increasing viscosity with decreasing temperature it is therefore provided that the fuel pressure in the pressure accumulator, out of the injection via injectors into the combustion chambers, then lifting during the starting process, if it is determined that the internal combustion engine not within a certain period of time after the start of the Starting process, i.e. after reaching the starter speed starts.

In einer bevorzugten Weiterbildung werden Systemrückwirkungen durch Konstanthalten der anderen Einspritzparameter, insbesondere der Ansteuerdauer der Einspritzventile und des Einspritzbeginnes ausgeschaltet. Dadurch kann eine systematische Einregelung des Arbeitspunktes der Einspritzventile unter Konstanthaltung anderer arbeitspunktbestimmender Größen erfolgen. Die Stellgröße des dabei verwendeten binären Reglers ist der Kraftstoffdruck im Druckspeicher, die überwachte Regelgröße ist das Drehzahlverhalten der Brennkraftmaschine, insbesondere ein Drehzahlgradient.In a preferred further development, system repercussions by keeping the other injection parameters constant, in particular the control duration of the injection valves and the start of injection switched off. This can make a systematic Adjustment of the operating point of the injection valves under Other parameters determining the operating point are kept constant. The manipulated variable of the binary controller used is the fuel pressure in the pressure accumulator, the monitored controlled variable is the speed behavior of the internal combustion engine, especially a speed gradient.

Vorteilhafte Weiterbildungen der Erfindung sind Gegenstand der Unteransprüche.Advantageous developments of the invention are the subject of subclaims.

Die Erfindung wird nachfolgend unter Bezugnahme auf die Zeichnung in einem Ausführungsbeispiel näher erläutert. In der Zeichnung zeigen:

Fig. 1
Zeitreihen verschiedener Betriebsparameter einer Brennkraftmaschine während eines Startvorganges und
Fig. 2
ein Blockschaltbild eines binären Reglers zur Durchführung des Verfahrens zum Starten einer Brennkraftmaschine.
The invention is explained in more detail below with reference to the drawing in an exemplary embodiment. The drawing shows:
Fig. 1
Time series of various operating parameters of an internal combustion engine during a starting process and
Fig. 2
a block diagram of a binary controller for performing the method for starting an internal combustion engine.

Zum sicheren Start einer Dieselbrennkraftmaschine, die eine sogenannte "common rail"-Einspritzanlage aufweist, wird nachfolgendes Verfahren verwendet. Der genaue Aufbau der Brennkraftmaschine ist für das Verständnis dabei nur insofern von Bedeutung, als es sich um eine Brennkraftmaschine handelt, bei der die Einspritzung aus einem Druckspeicher über Einspritzventile erfolgt. Es muss sich nicht wie im nachfolgenden Fall um eine Dieselbrennkraftmaschine handeln.For the safe start of a diesel engine, the one has so-called "common rail" injection system, the following Procedure used. The exact structure of the internal combustion engine is only for the understanding of Meaning when it is an internal combustion engine, in which the injection from a pressure accumulator via injectors he follows. It doesn't have to be like the one below Case to be a diesel engine.

Der Zeitablauf des Startvorganges ist in Fig. 1 in Zeitreihen dargestellt. Dabei ist die Zeitreihe der Drehzahl N, des Kraftstoffdruckes FUP im Druckspeicher, der Ansteuerdauer TI der Einspritzventile sowie des Einspritzbeginnes SOI aufgetragen.The timing of the starting process is in time series in Fig. 1 shown. The time series of the speed N, the Fuel pressure FUP in the pressure accumulator, the control period TI of the injectors and the start of injection SOI.

Fig. 2 zeigt in einem Blockschaltbild den Regelkreis zur Arbeitspunktregelung der Einspritzventile. In diesem Regelkreis ist die Brennkraftmaschine mit M bezeichnet. Als Regelgröße wird die Drehzahl N überwacht. Ein Vorgabeglied P liefert einen Vorgabewert für den Kraftstoffdruck FUP, der dann an der Brennkraftmaschine M eingestellt wird. An der Brennkraftmaschine M werden noch weitere Betriebsparameter B eingestellt, insbesondere die Ansteuerdauer TI sowie der Einspritzbeginn SOI für die Einspritzventile. Die Steuerung der Brennkraftmaschine M mit diesen Parametern wird von einem nicht dargestellten Streuergerät übernommen, in dem auch der in Fig. 2 dargestellte Regelkreis als Programmmodul verwirklicht sein kann. Der vom Vorgabeglied P gelieferter Wert für den Kraftstoffdruck FUP wird um ein von einem Integralglied I gelieferten Wert erhöht. Das Integralglied I erhält an seinem Eingang eine Zeitspanne zugeführt. Dabei handelt es sich um diejenige Zeitspanne, in der die Drehzahl N der Brennkraftmaschine M gleich der Anlasserdrehzahl N_Starter ist. Die Bestimmung dieser Zeitspanne ist durch einen mit einem "=" bezeichneten Block symbolisch dargestellt, dem die Anlasserdrehzahl N_Starter und die Drehzahl N der Brennkraftmaschine zugeführt wird.2 shows the control circuit for operating point control in a block diagram of the injectors. In this control loop the internal combustion engine is designated with M. As a controlled variable the speed N is monitored. A default member P provides one Default value for the fuel pressure FUP, which is then at the Internal combustion engine M is set. On the internal combustion engine M further operating parameters B are set, in particular the activation period TI and the start of injection SOI for the injectors. Control of the internal combustion engine M with these parameters is from a not shown Spreading device taken over, in which also in Fig. 2nd shown control loop can be implemented as a program module can. The value for the fuel pressure supplied by the default element P. FUP is supplied by an integral member I. Value increased. The integral element I receives at its input fed a period of time. This is the one Time span in which the speed N of the internal combustion engine M is equal to the starter speed N_Starter. The determination this period of time is marked by an "=" The block is symbolically represented by the starter speed N_Starter and the speed N of the internal combustion engine is fed.

Zum Zeitpunkt t0 wird die Brennkraftmaschine mit der Anlasserdrehzahl N_Starter angetrieben. Gleichzeitig wird die Einspritzung mit Initialisierungswerten für die Ansteuerdauer TI, den Einspritzbeginn SOI und den Kraftstoffdruck FUP angesteuert. Im dargestellten Fall verharrt jedoch die Drehzahl N der Brennkraftmaschine M auf der Anlasserdrehzahl N_Starter. Die Brennkraftmaschine M bringt kein Drehmoment auf, die Drehzahl steigt nicht an.At time t0, the engine is at the starter speed N_Starter driven. At the same time, the injection with initialization values for the control duration TI, the start of injection SOI and the fuel pressure FUP controlled. In the case shown, however, the speed N remains of the internal combustion engine M on the starter speed N_Starter. The internal combustion engine M produces no torque Speed does not increase.

Ab dem Zeitpunkt t1 wird festgestellt, dass der so eingestellte Einspritzarbeitspunkt nicht zum gewünschten Startvorgang führt, da die Drehzahl N der Brennkraftmaschine M nicht steigt. Die Einspritzanlage befindet sich also nicht im notwendigen Arbeitspunkt. Nun wird unter Konstanthaltung der sonstigen Einspritzparameter sukzessive der Kraftstoffdruck FUP im Druckspeicher angehoben. In Fig. 1 ist eine lineare Steigerung des Kraftstoffdruckes FUP mit anwachsender Zeit seit dem Zeitpunkt t1 dargestellt. Es ist aber auch eine andere Steigerung des Kraftstoffdruckes FUP denkbar. Entscheidend ist lediglich, dass ab dem Zeitpunkt t1 der Kraftstoffdruck erhöht ist.From time t1, it is determined that the set in this way Injection operating point not for the desired starting process leads, because the speed N of the internal combustion engine M does not increases. The injection system is therefore not in the necessary Operating point. Now the other injection parameters successively the fuel pressure FBD raised in the pressure accumulator. In Fig. 1 is a linear one FUP fuel pressure increases with increasing time shown since time t1. But it is also different An increase in the FUP fuel pressure is conceivable. Crucial is only that from time t1 the fuel pressure is increased.

Zum Zeitpunkt t2 erzeugt die Brennkraftmaschine M nun erstmals ein Drehmoment, die Drehzahl N beginnt zu steigen. Dieser Anstieg zeigt, dass die Brennkraftmaschine M zu starten beginnt. Der Arbeitspunkt der Einspritzung liegt somit in einem gewünschten Bereich, in dem ein Startvorgang stattfinden kann. Deshalb wird der Arbeitspunkt gehalten, indem nicht nur wie bislang die sonstigen Einspritzparameter, insbesondere die Ansteuerdauer der TI der Einspritzventile und der Einspritzbeginn SOI, sondern auch der Kraftstoffdruck FUP im Druckspeicher konstant gehalten werden. Der Arbeitspunkt wird so lange beibehalten, bis die Brennkraftmaschine M zum Zeitpunkt t3 die Leerlaufdrehzahl erreicht. Dann wird die Brennkraftmaschine mit der herkömmlichen Leerlaufregelung betrieben, in der die bekannte Variation der Ansteuerdauer TI der Einspritzventile und des Einspritzbeginnes SOI erfolgt. Weiter wird der Kraftstoffdruck FUP im Druckspeicher auf den für den Leerlauf vorgesehenen Wert geführt.At time t2, the internal combustion engine M now generates for the first time a torque, the speed N begins to increase. This Rise shows that the internal combustion engine M start begins. The operating point of the injection is therefore one desired area in which a starting process take place can. Therefore the working point is kept by not only as before the other injection parameters, in particular the activation duration of the TI of the injection valves and the start of injection SOI, but also the fuel pressure FUP in the Pressure accumulator can be kept constant. The working point is maintained until the internal combustion engine M at the time t3 reaches idle speed. Then the internal combustion engine operated with the conventional idle control, in which the known variation of the control period TI Injectors and the start of injection SOI takes place. Further the fuel pressure FUP in the pressure accumulator to the for the idle value provided.

Der für den Start der Brennkraftmaschine arbeitende Regler nimmt also eine nichtlineare Regelung des Arbeitspunktes dahingehend vor, dass als Stellgröße der Kraftstoffdruck FUP im Druckspeicher verwendet wird und als Regelgröße die binäre Unterscheidung, ob die Brennkraftmaschine ein induziertes Moment aufbringt, herangezogen wird. Diese Regelgröße entspricht letztlich einem binären Signal, das anzeigt, ob eine Kraftstoffeinspritzung mit Verbrennung stattfindet. Denn nur dann steigt die Drehzahl N der Brennkraftmaschine M. Dass die Brennkraftmaschine M eine Änderung ihrer Drehzahl N zeigt, kann an der Überwachung der Drehzahl N direkt oder an deren erster zeitlicher Ableitung erkannt werden. Es kann somit sowohl die Drehzahl N als auch deren erste zeitliche Ableitung als Regelgröße verwendet werden. The controller working for starting the internal combustion engine takes a non-linear control of the working point accordingly that the fuel pressure FUP in the Pressure accumulator is used and the binary as control variable Differentiate whether the internal combustion engine has an induced torque applies, is used. This controlled variable corresponds ultimately a binary signal that indicates whether a Fuel injection with combustion takes place. Because only then the speed N of the internal combustion engine M increases Internal combustion engine M shows a change in its speed N, can directly monitor the speed N or at its first time derivative can be recognized. It can therefore both the speed N as well as its first time derivative can be used as a control variable.

Durch dieses Vorgehen sind sowohl ein temperaturabhängiges Verhalten der Einspritzventile durch geänderte Reibung oder geändertes Verhalten, beispielsweise eines Piezoaktors, bei niederen Temperaturen kompensiert, als auch Viskositätsänderungen des Kraftstoffes.By doing this, both are temperature dependent Behavior of the injectors due to changed friction or changed behavior, for example of a piezo actuator compensated for low temperatures, as well as changes in viscosity of fuel.

Die für den Start zum Zeitpunkt t0 verwendeten Parameter, insbesondere Einspritzparameter werden aufgrund dieser Kompensierung so gewählt, dass sie für normale Umgebungsbedingungen, d.h. eine warme Brennkraftmaschine M, optimal sind.The parameters used for the start at time t0, injection parameters in particular are due to this compensation chosen so that for normal environmental conditions, i.e. a warm internal combustion engine M, are optimal.

Diese Werte für den Kraftstoffdruck FUP, die Ansteuerdauer TI und den Einspritzbeginn SOI ermöglichen einen optimalen Start einer warmen Brennkraftmaschine, sind aber bei Kaltstartbedingungen untauglich, da sie dann in der Regel keine oder keine ausreichende Kraftstoffeinspritzung gewährleisten. Durch den Regelkreis, der das Einspritzventilverhalten bei erhöhter Reibung und das Kraftstoffverhalten bei gesteigerter Viskosität, die sich bei kalten Temperaturen einstellen, kompensiert, wird auch bei Kaltstartbedingungen ein optimales Startverhalten erreicht.These values for the fuel pressure FUP, the control period TI and the start of injection SOI enable an optimal start a warm internal combustion engine, but are in cold start conditions disabled, since then they usually do not or do not ensure sufficient fuel injection. Through the control loop, which affects the injection valve behavior increased friction and fuel behavior with increased Viscosity compensated for at cold temperatures, becomes an optimal one even in cold start conditions Start behavior achieved.

Claims (5)

Verfahren zum Starten einer Brennkraftmaschine, in deren Brennräume Kraftstoff aus einem Druckspeicher eingespritzt wird, bei dem a) der Kraftstoffdruck (FUP) im Druckspeicher mit Beginn eines Startvorganges auf einen Startwert gesetzt wird, b) die Brennkraftmaschine (M) mit einer Anlasserdrehzahl (N_Starter) gestartet wird, c) die Zeitdauer erfasst wird, in der die Drehzahl (N) der Brennkraftmaschine (M) auf dem Niveau der Anlasserdrehzahl (N_Starter) verharrt, und d) bei Überschreiten einer vorbestimmten Zeitdauer der Kraftstoffdruck (FUP) im Druckspeicher gesteigert wird, bis die Brennkraftmaschine (M) einen bestimmten Anstieg ihrer Drehzahl (N) zeigt. Method for starting an internal combustion engine, in the combustion chambers of which fuel is injected from a pressure accumulator, in which a) the fuel pressure (FBD) in the pressure accumulator is set to a starting value at the start of a starting process, b) the internal combustion engine (M) is started with a starter speed (N_Starter), c) the period of time is recorded in which the speed (N) of the internal combustion engine (M) remains at the level of the starter speed (N_Starter), and d) if a predetermined time period is exceeded, the fuel pressure (FUP) in the pressure accumulator is increased until the internal combustion engine (M) shows a certain increase in its speed (N). Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass während der Stufen c) und d) die übrigen Einspritzparameter, insbesondere die Dauer (TI) und der Beginn (SOI) der Einspritzungen, konstant auf vorgegebenen Werten gehalten werden.Method according to Claim 1, characterized in that the other injection parameters, in particular the duration (TI) and the start (SOI) of the injections, are kept constant at predetermined values during stages c) and d). Verfahren nach einem der vorherigen Ansprüche, dadurch gekennzeichnet, dass die Steigerung des Kraftstoffdruckes (FUP) von der Zeitspanne abhängig erfolgt, um die die vorbestimmte Zeitdauer überschritten wurde.Method according to one of the preceding claims, characterized in that the increase in the fuel pressure (FUP) takes place depending on the time period by which the predetermined time period was exceeded. Verfahren nach Anspruch 3, dadurch gekennzeichnet, dass der Kraftstoffdruck (FUP) monoton stetig mit der Zeitspanne gesteigert wird, bis die Brennkraftmaschine (M) eine vorbestimmte Drehzahl (N) erreicht hat.A method according to claim 3, characterized in that the fuel pressure (FUP) is increased monotonously steadily over the period of time until the internal combustion engine (M) has reached a predetermined speed (N). Verfahren nach einem der vorherigen Ansprüche, dadurch gekennzeichnet, dass der Start in den Stufen a) und b) mit Betriebsparametern erfolgt, die für eine warme Brennkraftmaschine (M) optimal sind.Method according to one of the preceding claims, characterized in that the start in stages a) and b) takes place with operating parameters which are optimal for a warm internal combustion engine (M).
EP01104950A 2000-03-09 2001-02-28 Method for starting an internal combustion engine Expired - Lifetime EP1132613B1 (en)

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Cited By (4)

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EP1298303A2 (en) * 2001-09-27 2003-04-02 Robert Bosch Gmbh Method and control and/or regulation device for operating an internal combustion engine, and internal combustion engine
DE102009040321B4 (en) * 2009-09-05 2020-08-27 Andreas Stihl Ag & Co. Kg Method for operating an internal combustion engine
DE102018001114B4 (en) * 2017-02-20 2021-03-18 Scania Cv Ab SYSTEM AND METHOD OF CONTROLLING THE OPERATION OF A STARTER FOR AN COMBUSTION ENGINE
DE102012210708B4 (en) 2012-06-25 2021-12-02 Robert Bosch Gmbh Method and arrangement for determining a correction factor for correcting an injection profile in a motor vehicle under cold start conditions to ensure faster and more reliable engine start and engine restart

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AT388030B (en) * 1982-02-12 1989-04-25 Steyr Daimler Puch Ag FUEL INJECTION SYSTEM FOR AN ELECTRICAL ENGINE, INCLUDING A STARTER LOCK, WITH DIESEL ENGINES

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AT388030B (en) * 1982-02-12 1989-04-25 Steyr Daimler Puch Ag FUEL INJECTION SYSTEM FOR AN ELECTRICAL ENGINE, INCLUDING A STARTER LOCK, WITH DIESEL ENGINES
US4528963A (en) * 1983-05-09 1985-07-16 Toyota Jidosha Kabushiki Kaisha Method of and system for controlling restart of engine
DE3707635A1 (en) * 1987-03-10 1988-09-22 Pierburg Gmbh Method and device for starting an internal combustion engine

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1298303A2 (en) * 2001-09-27 2003-04-02 Robert Bosch Gmbh Method and control and/or regulation device for operating an internal combustion engine, and internal combustion engine
EP1298303A3 (en) * 2001-09-27 2004-12-01 Robert Bosch Gmbh Method and control and/or regulation device for operating an internal combustion engine, and internal combustion engine
DE102009040321B4 (en) * 2009-09-05 2020-08-27 Andreas Stihl Ag & Co. Kg Method for operating an internal combustion engine
DE102012210708B4 (en) 2012-06-25 2021-12-02 Robert Bosch Gmbh Method and arrangement for determining a correction factor for correcting an injection profile in a motor vehicle under cold start conditions to ensure faster and more reliable engine start and engine restart
DE102018001114B4 (en) * 2017-02-20 2021-03-18 Scania Cv Ab SYSTEM AND METHOD OF CONTROLLING THE OPERATION OF A STARTER FOR AN COMBUSTION ENGINE

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