EP1238190B1 - Method for improving the starting performance of an internal combustion engine comprising a high-pressure accumulator injection system - Google Patents

Method for improving the starting performance of an internal combustion engine comprising a high-pressure accumulator injection system Download PDF

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Publication number
EP1238190B1
EP1238190B1 EP00993428A EP00993428A EP1238190B1 EP 1238190 B1 EP1238190 B1 EP 1238190B1 EP 00993428 A EP00993428 A EP 00993428A EP 00993428 A EP00993428 A EP 00993428A EP 1238190 B1 EP1238190 B1 EP 1238190B1
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EP
European Patent Office
Prior art keywords
internal combustion
combustion engine
pressure
fuel
bkm
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP00993428A
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German (de)
French (fr)
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EP1238190A2 (en
Inventor
Achim Przymusinski
Udo Philippi
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Siemens AG
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Siemens AG
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02MSUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M63/00Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • F02M63/02Fuel-injection apparatus having several injectors fed by a common pumping element, or having several pumping elements feeding a common injector; Fuel-injection apparatus having provisions for cutting-out pumps, pumping elements, or injectors; Fuel-injection apparatus having provisions for variably interconnecting pumping elements and injectors alternatively
    • F02M63/0225Fuel-injection apparatus having a common rail feeding several injectors ; Means for varying pressure in common rails; Pumps feeding common rails
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02DCONTROLLING COMBUSTION ENGINES
    • F02D41/00Electrical control of supply of combustible mixture or its constituents
    • F02D41/02Circuit arrangements for generating control signals
    • F02D41/04Introducing corrections for particular operating conditions
    • F02D41/06Introducing corrections for particular operating conditions for engine starting or warming up
    • F02D41/062Introducing corrections for particular operating conditions for engine starting or warming up for starting
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02DCONTROLLING COMBUSTION ENGINES
    • F02D41/00Electrical control of supply of combustible mixture or its constituents
    • F02D41/30Controlling fuel injection
    • F02D41/38Controlling fuel injection of the high pressure type
    • F02D41/3809Common rail control systems
    • F02D41/3836Controlling the fuel pressure
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02DCONTROLLING COMBUSTION ENGINES
    • F02D41/00Electrical control of supply of combustible mixture or its constituents
    • F02D41/30Controlling fuel injection
    • F02D41/38Controlling fuel injection of the high pressure type
    • F02D41/3809Common rail control systems
    • F02D41/3836Controlling the fuel pressure
    • F02D41/3845Controlling the fuel pressure by controlling the flow into the common rail, e.g. the amount of fuel pumped
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02MSUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M2200/00Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/40Fuel-injection apparatus with fuel accumulators, e.g. a fuel injector having an integrated fuel accumulator
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02NSTARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR
    • F02N11/00Starting of engines by means of electric motors
    • F02N11/08Circuits or control means specially adapted for starting of engines
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02NSTARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR
    • F02N11/00Starting of engines by means of electric motors
    • F02N11/08Circuits or control means specially adapted for starting of engines
    • F02N11/0848Circuits or control means specially adapted for starting of engines with means for detecting successful engine start, e.g. to stop starter actuation
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02NSTARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR
    • F02N19/00Starting aids for combustion engines, not otherwise provided for
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02NSTARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR
    • F02N2200/00Parameters used for control of starting apparatus
    • F02N2200/06Parameters used for control of starting apparatus said parameters being related to the power supply or driving circuits for the starter
    • F02N2200/063Battery voltage

Definitions

  • the invention relates to a method for improving the Starting behavior of an internal combustion engine with a high-pressure accumulator injection system according to the preamble of the claim 1.
  • start time can only be shortened a little. In general will therefore be compared to other injection systems Extended start time for internal combustion engines with common rail injection technology currently tolerated.
  • EP 0 643 219 B1 describes a fuel injection system with a Prefeed pump, a high pressure pump, a fuel line and connected injectors known. moreover a fuel accumulator is provided which is connected to the fuel line communicates. For flushing the fuel line a valve is provided with which the fuel line can be connected to a return line to the tank. In a Starting phase, the valve is opened and in this way Flushing the fuel line and also adjusting one reached low pressure in the fuel line. Farther a bypass line is provided with which in the start phase the fuel delivered by the pre-feed pump at the High pressure pump conveyed past directly into the fuel line becomes.
  • the invention has for its object to provide a method with which the starting behavior of an internal combustion engine with a high-pressure accumulator injection system of the type mentioned Art is improved, especially the period up shortened to build up pressure in the high pressure accumulator injection system can be.
  • the system size battery voltage is evaluated. at the ignition is switched on, the operating voltage of the Internal combustion engine equipped vehicle is monitored and the occurrence of one by energizing a starter the internal combustion engine caused voltage drop at least the operating voltage as the point in time for the activation one of the hydraulic actuators volume flow control valve and pressure control valve used.
  • FIG 1 shows schematically the structure of a fuel injection system for a direct injection internal combustion engine BKM, as they are known under the common rail system used in vehicles with a diesel internal combustion engine becomes. Only those components are shown necessary for understanding the invention.
  • volume flow control valve VCV To the volume flow of the high pressure pump 14 into the high pressure accumulator 15 according to the respective operating conditions to be able to adjust the internal combustion engine BKM as required, is in the fuel line 11 between the prefeed pump 12 and the high pressure pump 14 an additional suction throttle valve, hereinafter referred to as volume flow control valve VCV, arranged, with the help of the flow of High pressure pump 14 can be controlled.
  • This volume flow control valve VCV is controlled by a control unit 16 Control line 17 driven.
  • the control unit 16 is preferably in an electronic control unit 18 of the internal combustion engine integrated, all for the operation of the internal combustion engine BKM controls and / or regulates the necessary processes.
  • the control unit 18 of the internal combustion engine BKM a large number recorded by means of appropriate sensors Input signals ES supplied.
  • the control unit 16 has a counter 32 and a memory 31 where, among other things a threshold value SW is stored, the Meaning later based on the description of Figure 2 is explained.
  • a pressure control valve PCV switched into the fuel line 11.
  • This pressure control valve PCV controls and / or regulates Excess a fuel return line 19 shown in dashed lines Fuel that is not used to maintain a required pressure in the high-pressure accumulator 15 is required, into the fuel tank 10, the holding pressure of the pressure control valve PCV from the control unit 16 via a Control line 20 is set.
  • a pressure sensor 21 is also provided. This pressure sensor 21 is used to detect the moment in the high pressure accumulator 15 prevailing pressure, on the Basis the control unit 16 according to the desired Operating conditions of the internal combustion engine BKM the pressure control via the pressure control valve PCV.
  • injectors 23 In the high pressure accumulator 15 can be shown with the help of the Arrangement generate fuel pressures from 0 to 1500 bar. These fuel pressures are available via fuel injection lines 22 to injectors referred to as injectors 23, which are arranged in the combustion chambers of the internal combustion engine BKM are at. These injectors 23 generally have an injection nozzle with a spring-loaded needle is closed. The injection process is through the Control unit 16 triggered via control lines 24 with the injectors 23 is connected. The one in the injectors 23 Leakage flow occurring is shown by dashed lines Fuel return lines 25 in the fuel tank 10 returned.
  • crankshaft sensor on the internal combustion engine BKM 33 provided, the one corresponding to the speed of the crankshaft Signal to the control unit 16 for further processing emits.
  • the prefeed pump 12 is in a preferred embodiment driven by an electric motor 26 via a control line 27 is connected to the control unit 16. Furthermore can such an electrically driven pre-feed pump 12 can also be made adjustable in speed.
  • the prefeed pump 12 and the high pressure pump 14 can also are driven by the internal combustion engine BKM, whose Speeds then with a fixed gear ratio proportional to the speed of the internal combustion engine.
  • the prefeed pump 12 is preferably in the housing the high pressure pump 14 integrated.
  • the high-pressure pump 14 may be independent driven by the speed of the internal combustion engine BKM, for example by means of an electric motor.
  • FIG. 1 there is a reference numeral 28 Vehicle battery, which emits an on-board voltage VB and their positive pole to a terminal KL30 of an ignition switch 29 is guided, while the negative pole with the vehicle body connected is.
  • the output marked with terminal KL15 the ignition starter switch 29 is via an unspecified one Line with the control unit 16 and the control unit 18 connected.
  • At terminal KL 15 (connected plus after Vehicle battery) is live when the ignition is switched on is, i.e. the ignition switch 29 in the designated 1 Position is.
  • the output labeled terminal 50 the ignition starter switch 29 is via an unspecified one Line with a starter 30 (starter) of the internal combustion engine BKM connected.
  • the positive pole of the vehicle battery is also 28 led to the starter 30.
  • the ignition switch 29 In the position marked with position 2. Thereby the start-up process of the internal combustion engine BKM is initiated.
  • the pressure control valve PCV opened to the fuel from the high pressure accumulator drain.
  • the volume flow control valve VCV remains the shutdown of the internal combustion engine BKM during the run-on the control unit 16 briefly opened to the pump room to fill the high pressure pump 14 again. This eliminates the next time the BKM engine is started, the filling this dead space, resulting in faster operational readiness of the high pressure accumulator injection system.
  • the pressure control valve PCV open when de-energized, i.e. when switching off the internal combustion engine BKM it is switched off.
  • the volume flow control valve VCV is closed without current, so that after expiration the run-on time by switching off the power supply Fuel supply line 11 to the high pressure pump 14 is interrupted is. If the power supply fails, both take Valves in a safe state.
  • the hydraulic actuators volume flow control valve VCV and pressure control valve PCV immediately can be controlled.
  • the pressure control valve is used for quick pressure build-up PCV closed and the volume flow control valve VCV opened so that fuel is delivered to the high pressure pump 14 and can be compressed by it. requirement for this is a quick recognition of the starting process Internal combustion engine BKM to the hydraulic actuators in the controlled way early.
  • the diagram in FIG. 2 shows how the Starting time of the internal combustion engine BKM as early as possible can be recognized.
  • the signals for the Pressure control valve PCV and for the volume flow control valve VCV are in the order of bottom up, and the course of the battery voltage VB and a signal FLAG applied by a crankshaft sensor.
  • the ignition key is turned Ignition switched on, i.e. the battery voltage is at terminal KL15 VB on.
  • the battery voltage is at terminal KL15 VB on.
  • the current measured value at the time of sampling n becomes with the previous measured value at the time of sampling compared n-1. According to one, from the behavior of the Drivers of the vehicle dependent period of time will continue by turning the ignition key the starting process of the internal combustion engine BKM initiated at time t2.
  • the starter 30 At the KL30 terminal there is the battery voltage VB and thus the starter 30 energized.
  • starter 30 Due to the high current consumption of starter 30 is a significantly high drop in battery voltage VB measurable at time t2. So a measured value is significant (e.g. 20%) less than the previous measured value, then closed a desired starting process of the internal combustion engine and the components required for pressure build-up in the high-pressure accumulator injection system are relevant immediately driven. These components are usually the volume flow control valve VCV and the pressure control valve PCV. To the At time t2, the volume flow control valve VCV is thus opened and the pressure control valve PCV closed.
  • the evaluation of successive measured values at the times n, n-1 is advantageously done by forming the difference of the two measured values and comparison of the difference with one SW threshold.
  • This threshold SW is determined by tests experimental on the test bench for a given starter determined and is in a memory 31 of the control unit 16 filed.
  • a counter 32 is started.
  • the counter 32 reaches a predetermined end value without that the signal FLAG from the crankshaft sensor 33 rotates the crankshaft indicates (time t3 in Figure 2), the Hydraulic actuators volume flow control valve VCV and pressure control valve PCV again via appropriate signals for operation "Standstill of the internal combustion engine” driven because obvious no start in the specified period the internal combustion engine BKM.
  • VCV Hydraulic actuators volume flow control valve
  • PCV pressure control valve
  • pre-feed pump 12 and the high pressure pump 14 are not powered by the internal combustion engine BKM itself, but by means of separate electric motors, so these are also immediately after detection of the battery voltage dip at time t2 controlled immediately. This makes it even faster Realize pressure build-up in the high pressure accumulator injection system.

Abstract

In order to rapidly recognise the starting operation of an internal combustion engine (BKM) equipped with a high-pressure accumulator injection system, the system variable battery voltage (VB) is evaluated. Once the ignition has been started, the battery voltage (VB) of the motor vehicle which is equipped with the internal combustion engine (BKM) is monitored. The occurrence of a voltage dip in the operating voltage (VB), induced by the excitation of a starter (30) of an internal combustion engine (BKM) is used as the moment (t2) for triggering at least one of the hydraulic control members (volumetric-flow control valve VCV, pressure control valve PCV).

Description

Die Erfindung betrifft ein Verfahren zur Verbesserung des Startverhaltens einer Brennkraftmaschine mit Hochdruck-Speichereinspritzsystem gemäß dem Oberbegriff des Patentanspruches 1.The invention relates to a method for improving the Starting behavior of an internal combustion engine with a high-pressure accumulator injection system according to the preamble of the claim 1.

Für die Kraftstoffversorgung von Brennkraftmaschinen werden zunehmend Hochdruck-Speichereinspritzsysteme verwendet. Solche Einspritzsysteme sind als Common-Rail-Systeme (für Diesel-Brennkraftmaschinen) und HPDI-Einspritzsysteme (für Otto-Brennkraftmaschinen) bekannt. Bei diesen Einspritzsystemen wird der Kraftstoff mit einer Hochdruckpumpe in einen gemeinsamen Druckspeicher gefördert, von dem aus die Einspritzventile an den einzelnen Zylindern versorgt werden. Das Öffnen und Schließen der Einspritzventile wird in der Regel elektrisch oder elektromagnetisch gesteuert.For the fuel supply of internal combustion engines high pressure accumulator injection systems are increasingly used. Such Injection systems are common rail systems (for diesel engines) and HPDI injection systems (for Otto internal combustion engines) known. With these injection systems the fuel is pumped into a common high pressure pump Pressure accumulator promoted from which the injectors be supplied to the individual cylinders. The opening and closing the injectors is usually electrical or controlled electromagnetically.

Bei einem solchen Common-Rail-Einspritzsystem wird der Kraftstoff mit Hilfe der Hochdruckpumpe verdichtet, in dem als Rail bezeichneten Hochdruckspeicher gespeichert und durch die Injektoren genannten Einspritzventile in den Brennraum des Motors eingespritzt. Neben der Druckspeicherung dient das Rail auch zur Glättung von Druckpulsationen, wozu ein ausreichend großes Speichervolumen erforderlich ist.In such a common rail injection system, the fuel compressed with the help of the high pressure pump, in which as Rail designated high-pressure accumulator stored and through the Injectors called injectors in the combustion chamber of the Motors injected. In addition to the pressure storage, this also serves Rail also for smoothing pressure pulsations, which is sufficient large storage volume is required.

Brennkraftmaschinen mit Common-Rail-Einspritzsystemen benötigen zum Starten eine vergleichsweise längere Zeit als Brennkraftmaschinen mit Verteiler- oder Reiheneinspritzsystemen. Dies macht sich vor allem bei Fahrzeugen mit Start-Stop-Automatik negativ bemerkbar. Die Ursache für die längere Startzeit des Common-Rail-Systems ist das große gespeicherte Kraftstoffvolumen im Hochdruckbereich. Der Druck muß im gesamten Hochdruckbereich erst auf den Mindesteinspritzdruck gebracht werden, bevor die erste Einspritzung erfolgen kann. Um die Zeit zum Aufbau des minimalen Raildrucks beim Startvorgang zu verkürzen, bieten sich folgende Möglichkeiten an: Es kann das Volumen des Hochdruckspeichers verkleinert, das Hubvolumen der Hochdruckpumpe vergrößert oder die Anlaßdrehzahl erhöht werden. Jede dieser Maßnahmen hat jedoch bestimmte Nachteile zur Folge. Eine Verringerung des Hochdruckspeichervolumens scheidet aus, da dadurch die Dämpfung der Druckpulsationen verringert und der gespeicherte Druckenergievorrat vermindert wird. Dadurch würden gerade die wesentlichen Vorteile der Common-Rail-Technik aufgehoben werden. Die Vergrößerung des Hubvolumens der Hochdruckpumpe bei gleichem Übersetzungsverhältnis hätte eine für den Betrieb überdimensionierte Pumpe und damit eine erhöhte Leistungsaufnahme zur Folge. Gerade bei Hochdrucksystemen muß aber aus energieökonomischen Gründen auf eine leistungsangepaßte Auslegung der Pumpen geachtet werden. Die Erhöhung der Anlasserdrehzahl ist technisch ebenfalls unpraktikabel und begrenzt.Internal combustion engines with common rail injection systems need to start a comparatively longer time than internal combustion engines with distributor or in-line injection systems. This is particularly the case for vehicles with automatic start-stop negatively noticeable. The cause of the longer The start time of the common rail system is the big one saved High volume fuel volume. The pressure must be in the whole High pressure area only to the minimum injection pressure brought before the first injection can take place. At the time to build up the minimum rail pressure during the starting process The following options are available to shorten: It can reduce the volume of the high pressure accumulator Stroke volume of the high pressure pump increases or the starting speed increase. However, each of these measures has certain Disadvantages result. A reduction in the high-pressure storage volume is ruled out, as this dampens the pressure pulsations reduced and the stored pressure energy supply is reduced. This would make the essential ones Advantages of common rail technology can be lifted. The enlargement the stroke volume of the high pressure pump with the same transmission ratio would have one oversized for operation Pump and thus an increased power consumption Episode. Especially with high-pressure systems, however, must be energy-efficient Reasons for a performance-based interpretation of the Pumps are respected. The increase in starter speed is technically also impractical and limited.

Durch vertretbare Kompromisse zwischen den erwähnten Maßnahmen läßt sich die Startzeit nur wenig verkürzen. Im allgemeinen wird daher die im Vergleich mit anderen Einspritzsystemen verlängerte Startzeit bei Brennkraftmaschinen mit Common-Rail-Einspritztechnik derzeit toleriert.Through acceptable compromises between the measures mentioned the start time can only be shortened a little. In general will therefore be compared to other injection systems Extended start time for internal combustion engines with common rail injection technology currently tolerated.

Aus EP 0 643 219 B1 ist ein Kraftstoffeinspritzsystem mit einer Vorförderpumpe, einer Hochdruckpumpe, einer Kraftstoffleitung und daran angeschlossenen Injektoren bekannt. Zudem ist ein Kraftstoffspeicher vorgesehen, der mit der Kraftstoffleitung in Verbindung steht. Zum Spülen der Kraftstoffleitung ist ein Ventil vorgesehen, mit dem die Kraftstoffleitung mit einer Rückleitung zum Tank verbindbar ist. In einer Startphase wird das Ventil geöffnet und auf diese Weise ein Spülen der Kraftstoffleitung und zudem eine Einstellung eines niedrigen Druckes in der Kraftstoffleitung erreicht. Weiterhin ist eine Bypaßleitung vorgesehen, mit der in der Startphase der von der Vorförderpumpe geförderte Kraftstoff an der Hochdruckpumpe vorbei direkt in die Kraftstoffleitung befördert wird.EP 0 643 219 B1 describes a fuel injection system with a Prefeed pump, a high pressure pump, a fuel line and connected injectors known. moreover a fuel accumulator is provided which is connected to the fuel line communicates. For flushing the fuel line a valve is provided with which the fuel line can be connected to a return line to the tank. In a Starting phase, the valve is opened and in this way Flushing the fuel line and also adjusting one reached low pressure in the fuel line. Farther a bypass line is provided with which in the start phase the fuel delivered by the pre-feed pump at the High pressure pump conveyed past directly into the fuel line becomes.

Aus DE 195 47 877 A1 ist ein Kraftstoffhochdruckspeichersystem für eine Brennkraftmaschine bekannt, bei der ein Kraftstoffspeicher vorgesehen ist und zudem ein Kraftstoffzusatzspeicher über ein ansteuerbares Ventil mit dem Kraftstoffspeicher verbindbar ist. Für eine schnelle Erhöhung des Kraftstoffdruckes im Kraftstoffspeicher wird das Ventil geöffnet und der hohe Druck des Kraftstoffzusatzspeichers auf den Kraftstoffspeicher übertragen.DE 195 47 877 A1 describes a high-pressure fuel storage system known for an internal combustion engine in which a fuel accumulator is provided and also a fuel additive store via a controllable valve with the fuel accumulator is connectable. For a quick increase in Fuel pressure in the fuel accumulator, the valve is opened and the high pressure of the additional fuel reservoir transfer the fuel storage.

Der Erfindung liegt die Aufgabe zugrunde, ein Verfahren anzugeben, mit dem das Startverhalten einer Brennkraftmaschine mit einem Hochdruck-Speichereinspritzsystem der eingangs genannten Art verbessert wird, insbesondere die Zeitspanne bis zum Druckaufbau im Hochdruck-Speichereinspritzsystem verkürzt werden kann.The invention has for its object to provide a method with which the starting behavior of an internal combustion engine with a high-pressure accumulator injection system of the type mentioned Art is improved, especially the period up shortened to build up pressure in the high pressure accumulator injection system can be.

Diese Aufgabe wird durch die Merkmale des Patentanspruches 1 gelöst.This object is achieved by the features of claim 1 solved.

Zum schnellen Erkennen des Startvorganges einer mit Hochdruck-Speichereinspritzsystem ausgestatteten Brennkraftmaschine wird die Systemgröße Batteriespannung ausgewertet. Bei eingeschalteter Zündung wird die Betriebsspannung des mit der Brennkraftmaschine ausgerüsteten Fahrzeuges überwacht wird und das Auftreten eines durch das Bestromen eines Starters der Brennkraftmaschine hervorgerufenen Spannungseinbruches der Betriebsspannung als Zeitpunkt für das Ansteuern wenigstens eines der Hydraulikstellglieder Volumenstromregelventil und Druckregelventil herangezogen.For quick detection of the starting process with a high-pressure accumulator injection system equipped internal combustion engine the system size battery voltage is evaluated. at the ignition is switched on, the operating voltage of the Internal combustion engine equipped vehicle is monitored and the occurrence of one by energizing a starter the internal combustion engine caused voltage drop at least the operating voltage as the point in time for the activation one of the hydraulic actuators volume flow control valve and pressure control valve used.

Weitere vorteilhafte Ausgestaltungen des erfindungsgemäßen Verfahrens sind in den Unteransprüchen angegeben. Further advantageous embodiments of the invention Procedures are specified in the subclaims.

Die Erfindung wird nachfolgend unter Bezugnahme auf die Zeichnung näher erläutert. In der Zeichnung zeigt:

Figur 1
eine schematische Darstellung eines Einspritzsystems für eine direkteinspritzende Brennkraftmaschine und
Figur 2
ein Diagramm für ausgewählte Signalverläufe
The invention is explained in more detail below with reference to the drawing. The drawing shows:
Figure 1
a schematic representation of an injection system for a direct injection internal combustion engine and
Figure 2
a diagram for selected waveforms

Die Figur 1 zeigt schematisch den Aufbau eines Kraftstoffeinspritzsystems für eine direkteinspritzende Brennkraftmaschine BKM, wie sie unter der Bezeichnung Common-Rail-System vor allem bei Fahrzeugen mit einer Diesel-Brennkraftmaschine eingesetzt wird. Dabei sind nur diejenigen Komponenten dargestellt, die für das Verständnis der Erfindung nötig sind.Figure 1 shows schematically the structure of a fuel injection system for a direct injection internal combustion engine BKM, as they are known under the common rail system used in vehicles with a diesel internal combustion engine becomes. Only those components are shown necessary for understanding the invention.

Bei diesem Einspritzsystem wird Kraftstoff aus einem Kraftstoffvorratsbehälter 10 über eine Kraftstoffleitung 11 durch eine Vorförderpumpe 12 angesaugt. Die Vorförderpumpe 12 fördert den Kraftstoff über einen Kraftstoffilter 13 zu einer Hochdruckpumpe 14, die den Kraftstoff verdichtet und unter hohem Druck in einen Hochdruckspeicher 15, das sogenannte Rail einspeist. Dieser Hochdruckspeicher 15 hat neben der Druckspeicherung auch die wesentliche Aufgabe, durch ein ausreichend großes Speichervolumen Druckpulsationen zu glätten.With this injection system, fuel is generated from a fuel tank 10 through a fuel line 11 through a prefeed pump 12 is sucked in. The pre-feed pump 12 delivers the fuel via a fuel filter 13 to one High pressure pump 14 which compresses the fuel and under high pressure in a high pressure accumulator 15, the so-called Rail feeds. This high pressure accumulator 15 has in addition to Pressure storage is also the essential task through a sufficient large storage volume to smooth out pressure pulsations.

Um den Volumenstrom der Hochdruckpumpe 14 in den Hochdruckspeicher 15 entsprechend den jeweiligen Betriebsbedingungen der Brennkraftmaschine BKM bedarfsabhängig einstellen zu können, ist in der Kraftstoffleitung 11 zwischen der Vorförderpumpe 12 und der Hochdruckpumpe 14 ein zusätzliches Saugdrosselventil, im folgenden als Volumenstromregelventil VCV bezeichnet, angeordnet, mit dessen Hilfe der Förderstrom der Hochdruckpumpe 14 geregelt werden kann. Dieses Volumenstromregelventil VCV wird von einer Steuereinheit 16 über eine Steuerleitung 17 angesteuert. Die Steuereinheit 16 ist vorzugsweise in ein elektronisches Steuergerät 18 der Brennkraftmaschine integriert, das alle zum Betrieb der Brennkraftmaschine BKM nötigen Abläufe steuert und/oder regelt. Hierzu werden dem Steuergerät 18 der Brennkraftmaschine BKM eine Vielzahl mittels entsprechender Sensorik aufgenommene Eingangssignale ES zugeführt. Über Ausgangssignale AS werden die einzelnen Aktoren und Komponenten angesteuert, die zum Betrieb der Brennkraftmaschine BKM notwendig sind. Die Steuereinheit 16 weist einen Zähler 32, sowie einen Speicher 31 auf, in dem u.a. ein Schwellenwert SW gespeichert ist, dessen Bedeutung später anhand der Beschreibung der Figur 2 näher erläutert wird.To the volume flow of the high pressure pump 14 into the high pressure accumulator 15 according to the respective operating conditions to be able to adjust the internal combustion engine BKM as required, is in the fuel line 11 between the prefeed pump 12 and the high pressure pump 14 an additional suction throttle valve, hereinafter referred to as volume flow control valve VCV, arranged, with the help of the flow of High pressure pump 14 can be controlled. This volume flow control valve VCV is controlled by a control unit 16 Control line 17 driven. The control unit 16 is preferably in an electronic control unit 18 of the internal combustion engine integrated, all for the operation of the internal combustion engine BKM controls and / or regulates the necessary processes. For this purpose, the control unit 18 of the internal combustion engine BKM a large number recorded by means of appropriate sensors Input signals ES supplied. Via output signals AS the individual actuators and components are controlled, which for Operation of the internal combustion engine BKM are necessary. The control unit 16 has a counter 32 and a memory 31 where, among other things a threshold value SW is stored, the Meaning later based on the description of Figure 2 is explained.

Um den Druck im Hochdruckspeicher 15 entsprechend den gewünschten Betriebsbedingungen der Brennkraftmaschine BKM einstellen zu können, ist weiterhin nach der Hochdruckpumpe 14 ein Druckregelventil PCV in die Kraftstoffleitung 11 geschaltet. Dieses Druckregelventil PCV steuert und/oder regelt über eine gestrichelt dargestellte Kraftstoffrückführleitung 19 überschüssigen Kraftstoff, der nicht zur Aufrechterhaltung eines im Hochdruckspeicher 15 gewünschten Drucks benötigt wird, in den Kraftstoffvorratsbehälter 10 ab, wobei der Haltedruck des Druckregelventils PCV von der Steuereinheit 16 über eine Steuerleitung 20 eingestellt wird. Zur Druckregelung im Hochdruckspeicher 15 ist weiter ein Drucksensor 21 vorgesehen. Dieser Drucksensor 21 dient zum Erfassen des augenblicklich im Hochdruckspeicher 15 herrschenden Druckes, auf dessen Grundlage die Steuereinheit 16 entsprechend den gewünschten Betriebsbedingungen der Brennkraftmaschine BKM die Druckregelung über das Druckregelventil PCV vornimmt.To the pressure in the high pressure accumulator 15 according to the desired Set operating conditions of the internal combustion engine BKM to be able to continue after the high pressure pump 14th a pressure control valve PCV switched into the fuel line 11. This pressure control valve PCV controls and / or regulates Excess a fuel return line 19 shown in dashed lines Fuel that is not used to maintain a required pressure in the high-pressure accumulator 15 is required, into the fuel tank 10, the holding pressure of the pressure control valve PCV from the control unit 16 via a Control line 20 is set. For pressure control in the high pressure accumulator 15, a pressure sensor 21 is also provided. This pressure sensor 21 is used to detect the moment in the high pressure accumulator 15 prevailing pressure, on the Basis the control unit 16 according to the desired Operating conditions of the internal combustion engine BKM the pressure control via the pressure control valve PCV.

Im Hochdruckspeicher 15 lassen sich mit Hilfe der dargestellten Anordnung Kraftstoffdrücke von 0 bis 1500 bar erzeugen. Diese Kraftstoffdrücke stehen über Kraftstoffeinspritzleitungen 22 an als Injektoren 23 bezeichnete Einspritzventilen, die in den Brennkammern der Brennkraftmaschine BKM angeordnet sind, an. Diese Injektoren 23 weisen im allgemeinen eine Einspritzdüse auf, die mit einer unter Federkraft stehenden Nadel verschlossen ist. Der Einspritzvorgang wird durch die Steuereinheit 16 ausgelöst, die über Steuerleitungen 24 mit den Injektoren 23 verbunden ist. Der in den Injektoren 23 auftretende Leckagestrom wird über gestrichelt dargestellte Kraftstoffrückführleitungen 25 in den Kraftstoffvorratsbehälter 10 zurückgeführt.In the high pressure accumulator 15 can be shown with the help of the Arrangement generate fuel pressures from 0 to 1500 bar. These fuel pressures are available via fuel injection lines 22 to injectors referred to as injectors 23, which are arranged in the combustion chambers of the internal combustion engine BKM are at. These injectors 23 generally have an injection nozzle with a spring-loaded needle is closed. The injection process is through the Control unit 16 triggered via control lines 24 with the injectors 23 is connected. The one in the injectors 23 Leakage flow occurring is shown by dashed lines Fuel return lines 25 in the fuel tank 10 returned.

Ferner ist an der Brennkraftmaschine BKM ein Kurbelwellensensor 33 vorgesehen, der ein der Drehzahl der Kurbelwelle entsprechendes Signal an die Steuereinheit 16 zur weiteren Verarbeitung abgibt.There is also a crankshaft sensor on the internal combustion engine BKM 33 provided, the one corresponding to the speed of the crankshaft Signal to the control unit 16 for further processing emits.

Die Vorförderpumpe 12 wird in einer bevorzugten Ausgestaltung über einen Elektromotor 26 angetrieben, der über eine Steuerleitung 27 mit der Steuereinheit 16 verbunden ist. Desweiteren kann eine solche elektrisch angetriebene Vorförderpumpe 12 auch in der Drehzahl regelbar ausgeführt sein.The prefeed pump 12 is in a preferred embodiment driven by an electric motor 26 via a control line 27 is connected to the control unit 16. Furthermore can such an electrically driven pre-feed pump 12 can also be made adjustable in speed.

Die Vorförderpumpe 12 und die Hochdruckpumpe 14 können auch von der Brennkraftmaschine BKM angetrieben werden, deren Drehzahlen sich dann mit einem festen Übersetzungsverhältnis proportional der Drehzahl der Brennkraftmaschine einstellt. Die Vorförderpumpe 12 ist dabei vorzugsweise in das Gehäuse der Hochdruckpumpe 14 integriert.The prefeed pump 12 and the high pressure pump 14 can also are driven by the internal combustion engine BKM, whose Speeds then with a fixed gear ratio proportional to the speed of the internal combustion engine. The prefeed pump 12 is preferably in the housing the high pressure pump 14 integrated.

Desweiteren ist es auch möglich, die Hochdruckpumpe 14 unabhängig von der Drehzahl der Brennkraftmaschine BKM anzutreiben, beispielsweise mittels eines Elektromotors.Furthermore, it is also possible for the high-pressure pump 14 to be independent driven by the speed of the internal combustion engine BKM, for example by means of an electric motor.

Weiterhin ist in der Figur 1 mit dem Bezugszeichen 28 eine Fahrzeugbatterie bezeichnet, die eine Bordspannung VB abgibt und deren Pluspol zu einer Klemme KL30 eines Zündstartschalters 29 geführt ist, während der Minuspol mit der Fahrzeugkarosserie verbunden ist. Der mit Klemme KL15 bezeichnete Ausgang des Zündstartschalters 29 ist über eine nicht näher bezeichnete Leitung mit der Steuereinheit 16 und dem Steuergerät 18 verbunden. An der Klemme KL 15 (geschaltetes Plus nach Fahrzeugbatterie) liegt Spannung, wenn die Zündung eingeschaltet ist, d.h. der Zündstartschalters 29 in der mit 1 bezeichneten Stellung ist. Der mit Klemme 50 bezeichnete Ausgang des Zündstartschalters 29 ist über eine nicht näher bezeichnete Leitung mit einem Anlasser 30 (Starter) der Brennkraftmaschine BKM verbunden. Ebenso ist der Pluspol der Fahrzeugbatterie 28 an den Anlasser 30 geführt. Zum Starten der Brennkraftmaschine BKM wird der Zündstartschalter 29 in die mit Position 2 gekennzeichnete Stellung gebracht. Dadurch wird der Startvorgang der Brennkraftmaschine BKM eingeleitet.Furthermore, in FIG. 1 there is a reference numeral 28 Vehicle battery, which emits an on-board voltage VB and their positive pole to a terminal KL30 of an ignition switch 29 is guided, while the negative pole with the vehicle body connected is. The output marked with terminal KL15 the ignition starter switch 29 is via an unspecified one Line with the control unit 16 and the control unit 18 connected. At terminal KL 15 (connected plus after Vehicle battery) is live when the ignition is switched on is, i.e. the ignition switch 29 in the designated 1 Position is. The output labeled terminal 50 the ignition starter switch 29 is via an unspecified one Line with a starter 30 (starter) of the internal combustion engine BKM connected. The positive pole of the vehicle battery is also 28 led to the starter 30. To start the Internal combustion engine BKM, the ignition switch 29 in the position marked with position 2. Thereby the start-up process of the internal combustion engine BKM is initiated.

Während des Normalbetriebes der Brennkraftmaschine BKM wird betriebspunktabhängig im Hochdruck-Speichereinspritzsystem ein bestimmter Druck und eine bestimmte Förderleistung durch entsprechende Ansteuerung der Hydraulikstellglieder Volumenstromregelventil VCV und Druckregelventil PCV mittels einer sogenannten Closed-Loop-Regelung eingestellt.During normal operation of the internal combustion engine BKM depending on the operating point in the high-pressure accumulator injection system a certain pressure and a certain delivery rate appropriate control of the hydraulic actuators volume flow control valve VCV and pressure control valve PCV using a so-called closed loop control set.

Beim Abstellen der Brennkraftmaschine BKM wird das Druckregelventil PCV geöffnet, um den Kraftstoff vom Hochdruckspeicher abzulassen. Das Volumenstromregelventil VCV bleibt nach dem Abstellen der Brennkraftmaschine BKM während des Nachlaufs der Steuereinheit 16 noch kurz geöffnet, um den Pumpraum der Hochdruckpumpe 14 wieder zu befüllen. Damit entfällt beim nächsten Start der Brennkraftmaschine BKM die Füllung dieses Totraumes, was zu einem schnelleren Betriebsbereitschaft des Hochdruck-Speichereinspritzsystems führt.When the internal combustion engine BKM is switched off, the pressure control valve PCV opened to the fuel from the high pressure accumulator drain. The volume flow control valve VCV remains the shutdown of the internal combustion engine BKM during the run-on the control unit 16 briefly opened to the pump room to fill the high pressure pump 14 again. This eliminates the next time the BKM engine is started, the filling this dead space, resulting in faster operational readiness of the high pressure accumulator injection system.

In einer bevorzugten Ausgestaltung ist das Druckregelventil PCV stromlos offen, d.h. beim Abschalten der Brennkraftmaschine BKM wird es stromlos geschaltet. Das Volumenstromregelventil VCV ist stromlos geschlossen, so daß nach Ablauf der Nachlaufzeit durch Abschalten der Stromversorgung die Kraftstoffzuleitung 11 zu der Hochdruckpumpe 14 unterbrochen ist. Bei Ausfall der Spannungsversorgung nehmen also beide Ventile einen sicheren Zustand ein.In a preferred embodiment, the pressure control valve PCV open when de-energized, i.e. when switching off the internal combustion engine BKM it is switched off. The volume flow control valve VCV is closed without current, so that after expiration the run-on time by switching off the power supply Fuel supply line 11 to the high pressure pump 14 is interrupted is. If the power supply fails, both take Valves in a safe state.

Um nach einem Start der Brennkraftmaschine BKM den Druck im Hochdruck-Speichereinspritzsystem möglichst schnell wieder auf einen Mindestwert aufzubauen, der für einen Einspritzvorgang benötigt wird, müssen die Hydraulikstellglieder Volumenstromregelventil VCV und Druckregelventil PCV unverzüglich angesteuert werden. Zum schnellen Druckaufbau wird das Druckregelventil PCV geschlossen und das Volumenstromregelventil VCV geöffnet, so daß Kraftstoff zu der Hochdruckpumpe 14 gefördert und von dieser verdichtet werden kann. Voraussetzung hierfür ist eine schnelle Erkennung des Startvorganges der Brennkraftmaschine BKM, um die Hydraulikstellglieder in der angegebenen Weise frühzeitig anzusteuern.To start the pressure in the BKM after starting the internal combustion engine High-pressure accumulator injection system again as quickly as possible to build up to a minimum value for an injection process is required, the hydraulic actuators volume flow control valve VCV and pressure control valve PCV immediately can be controlled. The pressure control valve is used for quick pressure build-up PCV closed and the volume flow control valve VCV opened so that fuel is delivered to the high pressure pump 14 and can be compressed by it. requirement for this is a quick recognition of the starting process Internal combustion engine BKM to the hydraulic actuators in the controlled way early.

Anhand des Diagrammes nach Figur 2 wird gezeigt, wie der Startzeitpunkt der Brennkraftmaschine BKM möglichst frühzeitig erkannt werden kann. Dabei sind in der Reihenfolge von unten nach oben die zeitlichen Verläufe der Signale für das Druckregelventil PCV und für das Volumenstromregelventil VCV, sowie der Verlauf der Batteriespannung VB und ein Signal FLAG von einem Kurbelwellensensor aufgetragen.The diagram in FIG. 2 shows how the Starting time of the internal combustion engine BKM as early as possible can be recognized. Here are in the order of bottom up the timing of the signals for the Pressure control valve PCV and for the volume flow control valve VCV, and the course of the battery voltage VB and a signal FLAG applied by a crankshaft sensor.

Da weder der Steuereinheit 16, noch der Steuerungseinrichtung 18 eine Information über den Schaltzustand des Starterrelais des Anlassers 30 vorliegt, also nicht direkt erkannt werden kann, wann der Fahrer durch Drehen des Zündschlüssels den Startvorgang der Brennkraftmaschine einleitet, wird gemäß der Erfindung die Systemgröße Batteriespannung VB ausgewertet. Since neither the control unit 16, nor the control device 18 information about the switching state of the starter relay of starter 30 is present, that is, it cannot be recognized directly when the driver can turn the ignition key Initiating the internal combustion engine is initiated according to the Invention evaluated the system size battery voltage VB.

Zum Zeitpunkt t1 wird durch Drehung des Zündschlüssels die Zündung eingeschaltet, d.h. an der Klemme KL15 liegt die Batteriespannung VB an. Im Betriebszustand "Zündung ein" und während des Stillstandes der Brennkraftmaschine BKM wird die Batteriespannung VB in einem festen Zeitraster, beispielsweise alle 10 ms gemessen. Der aktuelle Meßwert zum Abtastzeitpunkt n wird mit dem zeitlich vorhergehenden Meßwert zum Abtastzeitpunkt n-1 verglichen. Nach einer, vom Verhalten des Fahrer des Fahrzeugs abhängigen Zeitspanne wird durch Weiterdrehen des Zündschlüssels der Startvorgang der Brennkraftmaschine BKM zum Zeitpunkt t2 eingeleitet. An der Klemme KL30 liegt die Batteriespannung VB an und damit wird der Starter 30 bestromt. Aufgrund der hohen Stromaufnahme des Starters 30 ist ein signifikant hoher Einbruch der Batteriespannung VB zum Zeitpunkt t2 messbar. Ist also ein Meßwert signifikant (z.B. 20%) kleiner als der vorhergehende Meßwert, so wird auf einen gewünschten Startvorgang der Brennkraftmaschine geschlossen und die Komponenten, welche für einen Druckaufbau im Hochdruck-Speichereinspritzsystem relevant sind, unverzüglich angesteuert. Diese Komponenten sind im Regelfall das Volumenstromregelventil VCV und das Druckregelventil PCV. Zum Zeitpunkt t2 wird somit das Volumenstromregelventil VCV geöffnet und das Druckregelventil PCV geschlossen.At time t1, the ignition key is turned Ignition switched on, i.e. the battery voltage is at terminal KL15 VB on. In the operating state "ignition on" and while the internal combustion engine BKM is at a standstill Battery voltage VB in a fixed time grid, for example measured every 10 ms. The current measured value at the time of sampling n becomes with the previous measured value at the time of sampling compared n-1. According to one, from the behavior of the Drivers of the vehicle dependent period of time will continue by turning the ignition key the starting process of the internal combustion engine BKM initiated at time t2. At the KL30 terminal there is the battery voltage VB and thus the starter 30 energized. Due to the high current consumption of starter 30 is a significantly high drop in battery voltage VB measurable at time t2. So a measured value is significant (e.g. 20%) less than the previous measured value, then closed a desired starting process of the internal combustion engine and the components required for pressure build-up in the high-pressure accumulator injection system are relevant immediately driven. These components are usually the volume flow control valve VCV and the pressure control valve PCV. To the At time t2, the volume flow control valve VCV is thus opened and the pressure control valve PCV closed.

Die Auswertung aufeinanderfolgender Meßwerte zu den Zeitpunkten n,n-1 erfolgt in vorteilhafter Weise durch Differenzbildung der beiden Meßwerte und Vergleich der Differenz mit einem Schwellenwert SW. Dieser Schwellenwert SW wird durch Versuche auf dem Prüfstand für einen gegebenen Starter experimentell ermittelt und ist in einem Speicher 31 der Steuereinheit 16 abgelegt. The evaluation of successive measured values at the times n, n-1 is advantageously done by forming the difference of the two measured values and comparison of the difference with one SW threshold. This threshold SW is determined by tests experimental on the test bench for a given starter determined and is in a memory 31 of the control unit 16 filed.

Gleichzeitig zum Zeitpunkt t2 wird ein Zähler 32 gestartet. Erreicht der Zähler 32 einen vorgegebenen Zählerendwert ohne daß das Signal FLAG vom Kurbelwellensensor 33 eine Drehung der Kurbelwelle anzeigt (Zeitpunkt t3 in Figur 2), werden die Hydraulikstellglieder Volumenstromregelventil VCV und Druckregelventil PCV wieder über entsprechende Signale für den Betrieb "Stillstand der Brennkraftmaschine" angesteuert, da offensichtlich in der vorgegebenen Zeitspanne kein Anspringen der Brennkraftmaschine BKM erfolgte. Wird aufgrund des Signals des Kurbelwellensensors 33 von der Steuereinheit 16 eine Drehung der Kurbelwelle mit einer Drehzahl oberhalb der Anlasserdrehzahl erkannt, so wird die Brennkraftmaschine BKM inklusive der Hydraulikstellglieder mit Signalen für den normalen Betrieb außerhalb des Startvorganges gesteuert bzw. geregelt.At the time t2, a counter 32 is started. The counter 32 reaches a predetermined end value without that the signal FLAG from the crankshaft sensor 33 rotates the crankshaft indicates (time t3 in Figure 2), the Hydraulic actuators volume flow control valve VCV and pressure control valve PCV again via appropriate signals for operation "Standstill of the internal combustion engine" driven because obvious no start in the specified period the internal combustion engine BKM. Is due to the signal of the crankshaft sensor 33 from the control unit 16 Rotation of the crankshaft at a speed above the starter speed the BKM internal combustion engine is recognized including the hydraulic actuators with signals for normal Operation outside of the starting process controlled or regulated.

Da bereits zum Zeitpunkt t2 das Volumenstromregelventil VCV und das Druckregelventil PCV angesteuert werden und nicht erst das Signal FLAG der Drehzahlerkennung über den Kurbelwellensensor 33 zum späteren Zeitpunkt t3 ausgewertet wird, ergibt sich ein optimaler Startvorgang der Brennkraftmaschine BKM, weil damit ein sehr schneller Druckaufbau erzielt werden kann.Since the volume flow control valve VCV already at time t2 and the pressure control valve PCV can be controlled and not first the signal FLAG of the speed detection via the crankshaft sensor 33 is evaluated at a later time t3, there is an optimal starting process of the internal combustion engine BKM because it enables a very quick build-up of pressure can.

Wird die Vorförderpumpe 12 und die Hochdruckpumpe 14 nicht von der Brennkraftmaschine BKM selbst angetrieben, sondern mittels separater Elektromotoren, so werden auch diese sofort nach Erkennen des Batteriespannungseinbruchs zum Zeitpunkt t2 unverzüglich angesteuert. Damit läßt sich ein noch schnellerer Druckaufbau im Hochdruck-Speichereinspritzsystem realisieren.If the pre-feed pump 12 and the high pressure pump 14 are not powered by the internal combustion engine BKM itself, but by means of separate electric motors, so these are also immediately after detection of the battery voltage dip at time t2 controlled immediately. This makes it even faster Realize pressure build-up in the high pressure accumulator injection system.

Claims (8)

  1. Method for improving the start-up behaviour of an internal combustion engine (BKM) with a high-pressure storage injection system,
    in which fuel is supplied by means of a pre-supply pump (12) and a high-pressure pump (14) to a high-pressure reservoir (15), to which injectors (23) for injecting the fuel into the cylinders of the internal combustion engine (BKM) are connected and
    in which the pressure and the supply volume of the fuel is set by means of hydraulic actuators (VCV, PCV).
    characterised in that
    when ignition is activated the operating voltage (VB) of the vehicle equipped with the internal combustion engine (BKM) is monitored and the occurrence of a voltage dip in the operating voltage (VB) caused by energising a starter (30) of the internal combustion engine (BKM) is used as the time point (t2) for actuating at least one of the hydraulic actuators (VCV, PCV).
  2. Method according to Claim 1, characterised in that as a hydraulic actuator a volume flow control valve (VCV) disposed upstream of the high-pressure pump (14) is actuated at the time point (t2) such that it releases the flow of fuel towards the high-pressure pump (14).
  3. Method according to Claim 1 or 2, characterised in that as a hydraulic actuator a pressure control valve (PCV) disposed downstream of the high-pressure pump (14) is actuated at the time point (t2) such that it blocks the flow of fuel towards the high-pressure reservoir (15).
  4. Method according to Claim 1, characterised in that the pre-supply pump (12) is driven by means of an electric motor (26) and at the time point (t2) this is actuated such that the pre-supply pump (12) supplies fuel towards the high-pressure pump (14).
  5. Method according to Claim 1, characterised in that the high-pressure pump (14) is driven by means of an electric motor and at the time point (t2) this is actuated such that the high-pressure pump (14) compresses fuel.
  6. Method according to Claim 1, characterised in that in order to ascertain the voltage dip in the battery voltage (VB) this is measured in a fixed time frame, the difference between chronologically consecutive measured values (n, n-1) is formed, this difference is compared to a threshold value (SW) and a voltage dip caused by energising the starter (30) is indicated if the difference exceeds the threshold value (SW).
  7. Method according to Claim 6, characterised in that the threshold value (SW) is determined experimentally and is stored in a memory (31) of a control unit (16).
  8. Method according to Claim 1, characterised in that at the time point (t2) a counter (32) is started and when a predetermined upper counter value is reached the hydraulic actuators (VCV, PCV) are actuated with signals characteristic of the idle state of the internal combustion engine (BKM) if the signal (FLAG) of a crankshaft sensor (33) does not signal any rotation of the crankshaft.
EP00993428A 1999-12-15 2000-12-12 Method for improving the starting performance of an internal combustion engine comprising a high-pressure accumulator injection system Expired - Lifetime EP1238190B1 (en)

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DE19960546 1999-12-15
DE19960546 1999-12-15
PCT/DE2000/004416 WO2001044638A2 (en) 1999-12-15 2000-12-12 Method for improving the starting performance of an internal combustion engine comprising a high-pressure accumulator injection system

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DE102008021384B3 (en) * 2008-04-29 2009-11-26 Continental Aktiengesellschaft Superimposed pressure control of the common rail system

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US5598817A (en) 1993-09-10 1997-02-04 Mitsubishi Jidosha Kogyo Kabushiki Kaisha Fuel feeding system for internal combustion engine
JP3133586B2 (en) * 1993-11-18 2001-02-13 富士重工業株式会社 Fuel pressure control system for high pressure fuel injection engine
DE4425986B4 (en) * 1994-07-22 2004-04-08 Robert Bosch Gmbh Method and device for controlling an internal combustion engine
DE19547877A1 (en) 1995-12-21 1997-06-26 Bosch Gmbh Robert High-pressure fuel storage system for a fuel injection system used in internal combustion engines
JP3815512B2 (en) * 1996-08-23 2006-08-30 株式会社デンソー Control method for accumulator fuel supply device for engine
JP3612175B2 (en) * 1997-07-15 2005-01-19 株式会社日立製作所 Fuel pressure control device for in-cylinder injection engine

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Publication number Priority date Publication date Assignee Title
CN107299864A (en) * 2016-04-14 2017-10-27 福特环球技术公司 System and method for reducing microparticle matter exhaust
CN107299864B (en) * 2016-04-14 2022-05-13 福特环球技术公司 System and method for reducing particulate matter emissions

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