WO2003019003A1 - Method for starting a multicylinder internal combustion engine - Google Patents

Method for starting a multicylinder internal combustion engine Download PDF

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Publication number
WO2003019003A1
WO2003019003A1 PCT/DE2002/002121 DE0202121W WO03019003A1 WO 2003019003 A1 WO2003019003 A1 WO 2003019003A1 DE 0202121 W DE0202121 W DE 0202121W WO 03019003 A1 WO03019003 A1 WO 03019003A1
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WO
WIPO (PCT)
Prior art keywords
valves
internal combustion
combustion engine
starting
crankshaft
Prior art date
Application number
PCT/DE2002/002121
Other languages
German (de)
French (fr)
Inventor
Hermann Gaessler
Udo Diehl
Karsten Mischker
Rainer Walter
Bernd Rosenau
Stefan Franzl
Jürgen Schiemann
Christian Grosse
Volker Beuche
Stefan Reimer
Original Assignee
Robert Bosch Gmbh
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Robert Bosch Gmbh filed Critical Robert Bosch Gmbh
Publication of WO2003019003A1 publication Critical patent/WO2003019003A1/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
    • F02N19/00—Starting aids for combustion engines, not otherwise provided for
    • F02N19/004—Aiding engine start by using decompression means or variable valve actuation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L9/00—Valve-gear or valve arrangements actuated non-mechanically
    • F01L9/10—Valve-gear or valve arrangements actuated non-mechanically by fluid means, e.g. hydraulic
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L9/00—Valve-gear or valve arrangements actuated non-mechanically
    • F01L9/20—Valve-gear or valve arrangements actuated non-mechanically by electric means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L3/00—Lift-valve, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces; Parts or accessories thereof
    • F01L2003/25—Valve configurations in relation to engine
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L2800/00—Methods of operation using a variable valve timing mechanism

Definitions

  • the invention relates to a method for starting a multi-cylinder internal combustion engine.
  • the suction, compression, work and exhaust work cycles are controlled by opening and closing the intake and exhaust valves.
  • several pistons occupy the same position due to the improved mesh compensation. This means that, for example, in a 4-cylinder in-line engine, cylinders 1 and 4 are simultaneously in UT and _in TDC. The same applies to cylinders 2 and 3.
  • cylinders 1 and 4 and 2 and 3 work out of phase by 360 °.
  • the object of the invention is achieved in that the position of the pistons and the rotational speed of the crankshaft is recorded, the valve lift and / or the control times of the intake valves are calculated as a function of the rotational speed of the crankshaft, the intake valves of those cylinders whose pistons are at top dead center are opened, the inlet valves are closed after the intake stroke has ended, the fuel / air mixture is ignited after the compression stroke has ended and the exhaust valves are opened after the work stroke has ended.
  • the method according to the invention which uses the rotational speed of the crankshaft to calculate an optimal valve lift, improves the mixture formation during the intake stroke, so that a better starting behavior can be achieved. If the valve lift is small, the flow rate of the intake air is higher in the intake stroke, so that there is better swirling and mixing with the fuel. This effect leads to an increased ignitability of the fuel-air mixture. Since in modern internal combustion engines .a detecting the rotational speed of the crankshaft is present in any case, the author's invention resulting from -the realization TATIONS 'for. Starting the engine has no significant cost.
  • the control of the inlet valves and the outlet valves takes place electro-hydraulically and / or that the pressure in the hydraulic part of the electro-hydraulic control is also controlled in order to control the intake valves and the exhaust valves.
  • This measure further improves the control of the intake and exhaust valves depending on the speed of the crankshaft. For example, by reducing the pressure, the smallest valve lifts can be controlled with extremely low rotational speeds of the crankshaft with sufficient accuracy, which is of considerable importance in the practical implementation of the method according to the invention. At high speeds and correspondingly large valve strokes, it is advisable to raise the pressure in the hydraulic part of the electrohydraulic control so that quick control movements of the inlet valves and the outlet valves are possible.
  • the intake valves and the exhaust valves can also be controlled electromagnetically.
  • the transition from the operation of the internal combustion engine to the normal ignition sequence can take place either as a function of a specific speed or a specific number of revolutions of the crankshaft.
  • the method according to the invention is suitable both for gasoline engines and for diesel engines.
  • Figure 1 the crankshaft of a 4-cylinder in-line engine in a schematic representation
  • FIG. 2 is a block diagram of an electro-hydraulic. controlled starter valve
  • crankshaft 1 of a 4-cylinder in-line engine is shown schematically.
  • the crankshaft 1 is supported in three bearings 3 and has the crank pins I, II, III and IV. From Figure 1 it can be seen that the crank pins I and IV, and II and III extend in the same direction.
  • the pistons (not shown), which are connected to the crank pins I and IV via connecting rods, also not shown, have the same position. The same applies to the pistons, also not shown, which are connected to the crank pins II and III.
  • the method for starting a multi-cylinder internal combustion engine can also be used for engines with a different number of cylinders or another
  • V engines, W engines Arrangement of the cylinders (V engines, W engines) can be achieved.
  • the method according to the invention can also be used for engine types in which pistons of different cylinders do not assume the same position (radial engines). In this case, each cylinder that has reached TDC is activated so that an intake stroke takes place.
  • the fastest possible torque build-up and thus an improved starting behavior can also be achieved.
  • an inlet valve 5 is shown, which is controlled by a double-acting hydraulic cylinder 7.
  • the working spaces 9 and 11 of the hydraulic cylinder 7 are supplied with hydraulic fluid under pressure via hydraulic lines 13 and a pump 15.
  • the delivery flow of the pump 15 is controlled by a first switching valve 17 and a second switching valve 19.
  • the first switching valve 17 and the second switching valve 19 are designed as solenoid valves.
  • other types can also be used to carry out the method according to the invention.
  • valve lift and the dynamics of opening or closing the inlet valve 5 can be within wide limits Requirements of the internal combustion engine (not shown) are adapted. Depending on the operating conditions and ambient conditions of the internal combustion engine, this allows optimal control of the inlet valve 5, which contributes to a further improved starting behavior of the internal combustion engine. The same applies in a corresponding manner to the exhaust valves (not shown) of the internal combustion engine (also not shown).
  • the first switching valve 17, the second switching valve 19 and the pump 15 are controlled by a control device, which is not shown in FIG. 2.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Output Control And Ontrol Of Special Type Engine (AREA)
  • Valve Device For Special Equipments (AREA)

Abstract

The invention relates to a method for starting a multicylinder internal combustion engine which is not provided with camshafts. The admission valves are opened directly after the first TDC has been reached, in order to allow the combustion air to be taken in. The carburation can be further improved during the intake stroke by controlling the valve lift of the admission valves according to the number of revolutions. The starting behaviour of the internal combustion engine can thus be further improved, in general, in relation to other methods.

Description

Verfahren zum Starten einer Mehrzylinderbrennkraftmasc ineMethod for starting a multi-cylinder internal combustion engine
Stand der TechnikState of the art
Die Erfindung betrifft eine Verfahren zum Starten einer- Mehrzylinderbrennkraftmaschine . Bei Brennkraftmaschinen, die nach dem 4-Takt-Prinzip arbeiten, werden die Arbeitstakte Ansaugen, Verdichten, Arbeiten und Ausstoßen durch das Öffnen und Schließen der Ein- und Auslassventile gesteuert. Bei Mehrzylinderbrennkraftmaschinen nehmen, wegen des verbesserten Maschenausgleichs, mehrere Kolben die gleiche Stellung ein. Dies bedeutet, dass beispielsweise bei einem 4-Zylinder-Reihenmotor, die Zylinder 1 und 4 gleichzeitig in UT und _in OT sind. Gleiches gilt für die Zylinder 2 und 3. Um einen runden Motorlauf zu erhalten, arbeiten die Zylinder 1 und 4 sowie 2 und 3 um 360° phasenverschoben.The invention relates to a method for starting a multi-cylinder internal combustion engine. For internal combustion engines that work according to the 4-stroke principle, the suction, compression, work and exhaust work cycles are controlled by opening and closing the intake and exhaust valves. In multi-cylinder internal combustion engines, several pistons occupy the same position due to the improved mesh compensation. This means that, for example, in a 4-cylinder in-line engine, cylinders 1 and 4 are simultaneously in UT and _in TDC. The same applies to cylinders 2 and 3. To obtain a smooth engine run, cylinders 1 and 4 and 2 and 3 work out of phase by 360 °.
Aus der DE 197 42 969 AI ist ein Verfahren zum Starten einer nockenwellenlosen Mehrzylinderbrennkraftmaschine bekannt, -bei welchem die Zylinder, deren Kolben sich in der gleichen Stellung befinden, ohne Phasenverschiebung nach dem ersten Durchgang des Kolbens durch den OT so - angesteuert werden, dass ein Ansaugtakt durchlaufen wird. Dadurch wird gewährleistet, dass zum frühest möglichen Zeitpunkt nicht nur ein Zylinder sondern mehrere Zylinder¬ gleichzeitig zünden, sodass ein - schneller Drehzahlaufbau und somit ein verbessertes Startverhalten der Brennkraftmaschine erreicht wird. Der Erfindung liegt die Aufgabe zugrunde, dieses Verfahren weiter zu verbessern, sodasε ein noch schnellerer Drehmomentaufbau und ein weiter verbessertes Startverhalten der Brennkraftmaschine realisierbar wird.From DE 197 42 969 AI a method for starting a camshaft-free multi-cylinder internal combustion engine is known, in which the cylinders, the pistons of which are in the same position, are driven without phase shift after the first passage of the piston through the TDC so that a Suction cycle is run through. This ensures that the earliest possible time not only a cylinder but several cylinders fire ¬ simultaneously, so that a - faster speed construction and thus an improved starting performance of the internal combustion engine is achieved. The invention is based on the object of further improving this method, so that an even faster torque build-up and a further improved starting behavior of the internal combustion engine can be realized.
Die erfindungsgemäße Aufgabe wird dadurch gelöst, dass die Stellung der Kolben und die Drehgeschwindigkeit der Kurbelwelle erfasst wird, der Ventilhub und/oder die Steuerzeiten der Einlassventile in Abhängigkeit der Drehgeschwindigkeit der Kurbelwelle berechnet werden, die Einlassventile -derjenigen Zylinder, deren Kolben sich im oberen Totpunkt befinden, geöffnet werden, die Einlassventile nach Beendigung des Ansaugtakts geschlossen werden, das Brennstoffluftgemisch nach der Beendigung des Verdichtungstakts gezündet wird und die Auslassventile nach Beendigung des Arbeitstakts geöffnet werden.The object of the invention is achieved in that the position of the pistons and the rotational speed of the crankshaft is recorded, the valve lift and / or the control times of the intake valves are calculated as a function of the rotational speed of the crankshaft, the intake valves of those cylinders whose pistons are at top dead center are opened, the inlet valves are closed after the intake stroke has ended, the fuel / air mixture is ignited after the compression stroke has ended and the exhaust valves are opened after the work stroke has ended.
Vorteile der ErfindungAdvantages of the invention
Durch das erfindungsgemäße Verfahren, welches die Drehgeschwindigkeit der Kurbelwelle zur Berechnung eines optimalen Ventilhubs heranzieht, wird die Mischbildung während des Ansaugtakts überbessert, sodass ein besseres Startverhalten realisierbar ist. Wenn der Ventilhub gering ist, ist die Strömungsgeschwindigkeit der angesaugten Luft im Ansaugtakt höher, sodass eine bessere Verwirbelung und Vermischung mit dem Kraftstoff .erfolgt . Dieser Effekt führt zu einer erhöhten Zündwilligkeit des Brennstoff-Luft- Gemisches . Da bei modernen Brennkraftmaschinen .eine Erfassung der Drehgeschwindigkeit der Kurbelwelle ohnehin vorhanden ist, entstehen durch -die Realisierung des erfindungsgemäßen Verf hrens' zum. Starten der Brennkraftmaschine keine erheblichen Kosten.The method according to the invention, which uses the rotational speed of the crankshaft to calculate an optimal valve lift, improves the mixture formation during the intake stroke, so that a better starting behavior can be achieved. If the valve lift is small, the flow rate of the intake air is higher in the intake stroke, so that there is better swirling and mixing with the fuel. This effect leads to an increased ignitability of the fuel-air mixture. Since in modern internal combustion engines .a detecting the rotational speed of the crankshaft is present in any case, the author's invention resulting from -the realization TATIONS 'for. Starting the engine has no significant cost.
In weiterer Ergänzung der Erfindung ist vorgesehen, dass die Steuerung der Einlassventile und der Auslassventile elektrohydraulisch erfolgt und/oder, dass zur Steuerung der Einlassventile und der Auslassventile auch der Druck im hydraulischen Teil der elektrohydraulischen Steuerung gesteuert wird. Durch diese Maßnahme kann die Steuerung der Einlass- und der Auslassventile abhängig von der Drehzahl der Kurbelwelle weiter verbessert werden. So kann beispielsweise durch eine Absenkung des Drucks die Steuerung .kleinster Ventilhübe bei extrem geringen Drehgeschwindigkeiten der Kurbelwelle mit ausreichend • großer Genauigkeit erfolgen, was bei der praktischen Umsetzung des erfindungsgemäßen Verfahrens von erheblicher Bedeutung ist . Bei hohen Drehzahlen und entsprechend großen Ventilhüben empfiehlt es sich, den Druck im hydraulischen Teil der elektrohydraulischen Steuerung anzuheben, sodass schnelle Steuerbewegungen der Einlassventile und der Auslassventile möglich sind.In a further addition to the invention, it is provided that the control of the inlet valves and the outlet valves takes place electro-hydraulically and / or that the pressure in the hydraulic part of the electro-hydraulic control is also controlled in order to control the intake valves and the exhaust valves. This measure further improves the control of the intake and exhaust valves depending on the speed of the crankshaft. For example, by reducing the pressure, the smallest valve lifts can be controlled with extremely low rotational speeds of the crankshaft with sufficient accuracy, which is of considerable importance in the practical implementation of the method according to the invention. At high speeds and correspondingly large valve strokes, it is advisable to raise the pressure in the hydraulic part of the electrohydraulic control so that quick control movements of the inlet valves and the outlet valves are possible.
Alternativ kann die Steuerung der Einlassventile und der Auslassventile auch elektromagnetisch erfolgen.Alternatively, the intake valves and the exhaust valves can also be controlled electromagnetically.
Der Übergang des Betriebs der Brennkraftmaschine zu der normalen Zündfolge kann entweder in Abhängigkeit einer bestimmten Drehzahl oder einer bestimmten Zahl von Umdrehungen der Kurbelwelle erfolgen.The transition from the operation of the internal combustion engine to the normal ignition sequence can take place either as a function of a specific speed or a specific number of revolutions of the crankshaft.
Das erfindungsgemäße Verfahren ist sowohl für Otto-Motoren als auch für Dieselmotoren geeignet.The method according to the invention is suitable both for gasoline engines and for diesel engines.
Weitere Vorteile und vorteilhafte Ausgestaltungen der Erfindung sind der nachfolgenden Zeichnung, deren Beschreibungen und den Patentansprüchen entnehmbar.Further advantages and advantageous refinements of the invention can be found in the following drawing, its descriptions and the patent claims.
Zeichnungdrawing
Es zeigen: - Δ -Show it: - Δ -
Figur 1: die Kurbelwelle eines 4 -Zylinder-Reihenmotors in schematischer Darstellung undFigure 1: the crankshaft of a 4-cylinder in-line engine in a schematic representation and
Figur 2 : ein Blockschaltbild eines elektrohydraulisch. angesteuerten AnlassventilsFigure 2 is a block diagram of an electro-hydraulic. controlled starter valve
Beschreibung der AusführungsbeispieleDescription of the embodiments
In Figur 1 ist eine Kurbelwelle 1 eines 4 -Zylinder- Reihenmotors schematisch dargestellt. Die Kurbelwelle 1 ist in drei Lagern 3 gelagert und weist die Hubzapfen I, II, III und IV auf. Aus Figur 1 ist erkennbar, dass die Hubzapfen I und IV, sowie II und III sich in die gleiche Richtung erstrecken. Infolgedessen haben die Kolben (nicht dargestellt) , welche über ebenfalls nicht dargestellte Pleuel mit den Hubzapfen I und IV verbunden sind, die gleiche Stellung. Gleiches gilt für die ebenfalls nicht dargestellten Kolben, welche mit den Hubzapfen II und III verbunden sind.In Figure 1, a crankshaft 1 of a 4-cylinder in-line engine is shown schematically. The crankshaft 1 is supported in three bearings 3 and has the crank pins I, II, III and IV. From Figure 1 it can be seen that the crank pins I and IV, and II and III extend in the same direction. As a result, the pistons (not shown), which are connected to the crank pins I and IV via connecting rods, also not shown, have the same position. The same applies to the pistons, also not shown, which are connected to the crank pins II and III.
Im Normalbetrieb einer solchen Brennkraftmaschine werden die zum Hubzapfen I und zum Hubzapfen IV gehörenden Kolben um 360° phasenverschoben betrieben. Gleiches gilt für die Kolben der Hubzapfen II und III. Dadurch wird ein runder Motorlauf erreicht .In normal operation of such an internal combustion engine, the pistons belonging to the crank pin I and the crank pin IV are operated out of phase by 360 °. The same applies to the pistons of the crank pins II and III. This ensures smooth engine running.
Um ein besseres Startverhalten zu erreichen, können jedoch bei nockenwelleniosen Brennkraftmaschinen beim Start beispielsweise die Kolben der Hubzapfen I und IV synchron betrieben -werden und zwar so, dass unmittelbar nach dem Erreichen des oberen Totpunkts die Einlassventile beider zu den Kolben, gehörenden" Zylinder geöffnet werden und somit zum frühest möglichen Zeitpunkt ein Arbeitstakt von zwei Kolben der Brennkraftmaschine ermöglicht wird. Dadurch wird ein schnellstmöglicher Drehmomentaufbau und somit ein verbessertes Startverhalten der Brennkraftmaschine erreicht. Gleiches gilt entsprechend für die mit demIn order to achieve better starting characteristics, but with nockenwelleniosen engine startup for example, the piston of the crank pins I and IV synchronism can -Be operated namely that opened immediately after reaching the top dead center, the intake valves of both of the pistons belonging to "cylinder so as to be and thus an operating cycle of two pistons of the internal combustion engine is made possible at the earliest possible point in time reached. The same applies accordingly to those with the
Hubzapfen II und III verbundenen Kolben. Ein entsprechendesCrank pins II and III connected pistons. A corresponding one
Verfahren zum Starten einer mehrzylindrischen Brennkraftmaschine kann auch bei Motoren mit einer anderen Zylinderanzahl oder einer anderenThe method for starting a multi-cylinder internal combustion engine can also be used for engines with a different number of cylinders or another
Anordnung der Zylinder (V-Motoren, W-Motoren) erreicht werden.Arrangement of the cylinders (V engines, W engines) can be achieved.
Bei Motorenbauarten, bei denen Kolben verschiedener Zylinder nicht die gleiche Stellung einnehmen (Sternmotoren) , kann das erfindungsgemäße Verfahren ebenfalls angewandt werden. In diesem Fall wird jeder Zylinder, der den OT erreicht hat, so angesteuert, dass ein Ansaugtakt stattfindet. Somit ist durch die Anwendung des erfindungsgemäßen Verfahrens auf diese Motoren ebenfalls ein schnellstmöglicher Drehmomentaufbau und somit ein verbessertes Startverhalten realisierbar.The method according to the invention can also be used for engine types in which pistons of different cylinders do not assume the same position (radial engines). In this case, each cylinder that has reached TDC is activated so that an intake stroke takes place. Thus, by applying the method according to the invention to these motors, the fastest possible torque build-up and thus an improved starting behavior can also be achieved.
In Figur 2 ist ein Einlassventil 5 dargestellt, welches über einen doppelt wirkenden Hydraulikzylinder 7 gesteuert wird. Die Arbeitsräume 9 und 11 des Hydraulikzylinders 7 werden über hydraulische Leitungen 13 und eine Pumpe 15 mit unter Druck stehendem Hydraulikfluid versorgt. Gesteuert wird der Förderstrom der Pumpe 15 durch ein erstes Schaltventil 17 und ein zweites Schaltventil 19. Erstes Schaltventil 17 und zweites Schaltventil 19 sind in dem Ausführungsbeispiel gemäß Figur 2 als Magnetventile ausgebildet. Allerdings können auch andere Bauarten zur Durchführung des erfindungsgemäßen Verfahrens eingesetzt werden.In Figure 2, an inlet valve 5 is shown, which is controlled by a double-acting hydraulic cylinder 7. The working spaces 9 and 11 of the hydraulic cylinder 7 are supplied with hydraulic fluid under pressure via hydraulic lines 13 and a pump 15. The delivery flow of the pump 15 is controlled by a first switching valve 17 and a second switching valve 19. In the exemplary embodiment according to FIG. 2, the first switching valve 17 and the second switching valve 19 are designed as solenoid valves. However, other types can also be used to carry out the method according to the invention.
Durch die Zeiten, zu denen erstes Schaltvεntil 17 und zweites Schaltventil 19 angesteuert werden und durch eine Steuerung des Drucks der Pumpe 15 auf- der Förderseite können Ventilhub und die Dynamik des Öffnens -bzw, Schließens des Einlassventils 5 in -weiten Grenzen den Erfordernissen der Brennkraftmaschine (nicht dargestellt) angepasst werden. Dadurch kann, je nach den Betriebsbedingungen und Umgebungsbedingungen der Brennkraftmaschine, eine optimale Ansteuerung des Einlassventils 5 erfolgen, was zu einem weiter verbesserten Startverhalten der Brennkraftmaschine beiträgt. Gleiches gilt in entsprechender Weise für die nicht dargestellten Auslassventile der ebenfalls nicht dargestellten Brennkraftmaschine .Due to the times at which the first switching valve 17 and the second switching valve 19 are activated and by controlling the pressure of the pump 15 on the delivery side, valve lift and the dynamics of opening or closing the inlet valve 5 can be within wide limits Requirements of the internal combustion engine (not shown) are adapted. Depending on the operating conditions and ambient conditions of the internal combustion engine, this allows optimal control of the inlet valve 5, which contributes to a further improved starting behavior of the internal combustion engine. The same applies in a corresponding manner to the exhaust valves (not shown) of the internal combustion engine (also not shown).
Gesteuert werden erstes Schaltventil 17, zweites Schaltventil 19 und die Pumpe 15 durch ein Steuergerät, welches in Figur 2 nicht dargestellt ist.The first switching valve 17, the second switching valve 19 and the pump 15 are controlled by a control device, which is not shown in FIG. 2.
Bei abgeschaltetem Motor sind die Ein- und Auslassventile der Brennkraftmaschine geschlossen. Mit Betätigen des Anlassers können die Einlassventile sofort nach dem Erreichen des OT geöffnet werden und somit ein Ansaugtakt durchlaufen werden. Um eine möglichst gute Gemischaufbereitung zu erzielen, ist eine hohe Strömungsgeschwindigkeit der Luft durch das Einlassventil anzustreben. Wegen der niedrigen Drehzahl während des Startvorgangs und der damit geringen Geschwindigkeit des Kolbens beim Ansaugen ist es wünschenswert, während des Startvorgangs einen sehr geringen Ventilhub des Einlassventils 5 zu realisieren. Dies kann durch entsprechend kurzes Ansteuern von erstem Schaltvεntil 17 und zweitem Schaltventil 19 erfolgen. Durch eine Steuerung des Fδrderdrucks der Pumpe 15 hin zu niedrigen Werten können kleine Ventilhübe mit noch größerer Genauigkeit angesteuert werden. Somit ergibt sich durch die zur Verfügung stehenden Freiheitsgrade bei der Steuerung des Einlassventils 15 (Öffnungszeitpunkt, Öffnungsdauer, Ventilhub und Dynamik der Steuerbewegung des Einlassventils 5) ein weiter verbessertes Startverhalten der Mehrzylinderbrennkraftmaschine. When the engine is switched off, the intake and exhaust valves of the internal combustion engine are closed. When the starter is actuated, the intake valves can be opened immediately after reaching TDC and an intake stroke can be run through. In order to achieve the best possible mixture preparation, a high flow velocity of the air through the inlet valve should be aimed for. Because of the low rotational speed during the starting process and the low speed of the piston during suction, it is desirable to implement a very small valve lift of the inlet valve 5 during the starting process. This can be done by activating the first switching valve 17 and the second switching valve 19 in a correspondingly short manner. By controlling the delivery pressure of the pump 15 towards low values, small valve lifts can be controlled with even greater accuracy. This results in a further improved starting behavior of the multi-cylinder internal combustion engine due to the degrees of freedom available when controlling the inlet valve 15 (opening time, opening duration, valve lift and dynamics of the control movement of the inlet valve 5).

Claims

Ansprüche Expectations
1. Verfahren zum Starten einer1. Procedure for starting one
Mehrzylinderbrennkraf maschine , gekennzeichnet durch folgende Verfahrensschritte:Multi-cylinder internal combustion engine, characterized by the following process steps:
- Erfassen der Stellung der Kolben und der Drehgeschwindigkeit der Kurbelwelle,- detecting the position of the pistons and the rotational speed of the crankshaft,
- Berechnen des Ventilhubs und/oder der Steuerzeiten der Einlassventile (5) in Abhängigkeit der Drehgeschwindigkeit der Kurbelwelle,- Calculating the valve lift and / or the control times of the intake valves (5) as a function of the rotational speed of the crankshaft,
- Öffnen der Einlassventile ' (5) derjenigen Zylinder deren Kolben sich im oberen Totpunkt befinden,- opening of the intake valves' (5) of those cylinders whose pistons are at top dead center,
- Schließen der Einlassventile (5) nach Beendigung des Ansaugtakts ,- closing the inlet valves (5) after the intake stroke has ended,
- Zünden des Brennstoff-Luftgemischs nach der Beendigung des Verdichtungstakts undIgniting the fuel-air mixture after the compression stroke has ended and
- Öffnen der Auslaßventile nach Beendigung des Arbeitstakts.- Open the exhaust valves after the work cycle.
2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass die Steuerung der Einlaßventile (5) und der Auslaßventile elektrohydraulisch erfolgt.2. The method according to claim 1, characterized in that the control of the inlet valves (5) and the outlet valves is carried out electro-hydraulically.
3. Verfahren nach Anspruch 2, dadurch gekennzeichnet, dass zur Steuerung der Einlaßventile (5) und der Auslaßventile auch der Druck im hydraulischen Teil der elektrohydraulischen Steuerung gesteuert wird. 3. The method according to claim 2, characterized in that for controlling the inlet valves (5) and the exhaust valves, the pressure in the hydraulic part of the electro-hydraulic control is controlled.
4. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass die Steuerung der Einlaßventile (5) und der Auslaßventile elektromagnetisch erfolgt .4. The method according to claim 1, characterized in that the control of the inlet valves (5) and the outlet valves is carried out electromagnetically.
5. Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass nach Erreichen einer bestimmten Drehzahl oder nach einer bestimmten Zahl von Umdrehungen der Kurbelwelle die normale Zündfolge wieder hergestellt wird.5. The method according to any one of the preceding claims, characterized in that after reaching a certain speed or after a certain number of revolutions of the crankshaft, the normal ignition sequence is restored.
6. Verfahren nach einem der vorhergehenden Ansprüche , dadurch gekennzeichnet, dass die Brennkraftmaschine ein Octo-Motor oder ein Diesel-Motor ist. 6. The method according to any one of the preceding claims, characterized in that the internal combustion engine is an octo engine or a diesel engine.
PCT/DE2002/002121 2001-08-16 2002-06-11 Method for starting a multicylinder internal combustion engine WO2003019003A1 (en)

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DE10140063A DE10140063A1 (en) 2001-08-16 2001-08-16 Method for starting a multi-cylinder internal combustion engine

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US7280909B2 (en) 2004-03-19 2007-10-09 Ford Global Technologies Llc Valve control for an engine with electromechanically actuated valves
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EP1577544A3 (en) * 2004-03-19 2007-02-14 Ford Global Technologies, LLC Starting an engine with electromechanical valves
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US7650745B2 (en) 2004-03-19 2010-01-26 Ford Global Technologies, Llc Method to reduce engine emissions for an engine capable of multi-stroke operation and having a catalyst
US8191355B2 (en) 2004-03-19 2012-06-05 Ford Global Technologies, Llc Method to reduce engine emissions for an engine capable of multi-stroke operation and having a catalyst

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