EP0193788B1 - Method of controlling an amount of injected fuel - Google Patents
Method of controlling an amount of injected fuel Download PDFInfo
- Publication number
- EP0193788B1 EP0193788B1 EP19860102097 EP86102097A EP0193788B1 EP 0193788 B1 EP0193788 B1 EP 0193788B1 EP 19860102097 EP19860102097 EP 19860102097 EP 86102097 A EP86102097 A EP 86102097A EP 0193788 B1 EP0193788 B1 EP 0193788B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- control device
- pump
- internal combustion
- fuel
- speed range
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 239000000446 fuel Substances 0.000 title claims description 35
- 238000000034 method Methods 0.000 title claims description 6
- 238000002347 injection Methods 0.000 claims description 27
- 239000007924 injection Substances 0.000 claims description 27
- 238000002485 combustion reaction Methods 0.000 claims description 13
- 238000010586 diagram Methods 0.000 description 4
- 230000005284 excitation Effects 0.000 description 4
- 230000000903 blocking effect Effects 0.000 description 1
- 239000002828 fuel tank Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M45/00—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M41/00—Fuel-injection apparatus with two or more injectors fed from a common pressure-source sequentially by means of a distributor
- F02M41/08—Fuel-injection apparatus with two or more injectors fed from a common pressure-source sequentially by means of a distributor the distributor and pumping elements being combined
- F02M41/10—Fuel-injection apparatus with two or more injectors fed from a common pressure-source sequentially by means of a distributor the distributor and pumping elements being combined pump pistons acting as the distributor
- F02M41/12—Fuel-injection apparatus with two or more injectors fed from a common pressure-source sequentially by means of a distributor the distributor and pumping elements being combined pump pistons acting as the distributor the pistons rotating to act as the distributor
- F02M41/123—Fuel-injection apparatus with two or more injectors fed from a common pressure-source sequentially by means of a distributor the distributor and pumping elements being combined pump pistons acting as the distributor the pistons rotating to act as the distributor characterised by means for varying fuel delivery or injection timing
- F02M41/125—Variably-timed valves controlling fuel passages
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
- F02M59/20—Varying fuel delivery in quantity or timing
- F02M59/34—Varying fuel delivery in quantity or timing by throttling of passages to pumping elements or of overflow passages, e.g. throttling by means of a pressure-controlled sliding valve having liquid stop or abutment
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
- F02M59/20—Varying fuel delivery in quantity or timing
- F02M59/36—Varying fuel delivery in quantity or timing by variably-timed valves controlling fuel passages to pumping elements or overflow passages
- F02M59/366—Valves being actuated electrically
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B3/00—Engines characterised by air compression and subsequent fuel addition
- F02B3/06—Engines characterised by air compression and subsequent fuel addition with compression ignition
Definitions
- the invention relates to a method for controlling the fuel injection quantity according to the preamble of the main claim.
- most diesel engines have uncomfortable hard combustion noises in the idling or lower part-load range, which can be reduced by extending the injection duration in this speed range.
- the injection duration is extended in this speed range in that part of the fuel delivered can flow off without pressure via a solenoid-operated bypass, so that to maintain the engine speed as a result of the necessary replacement of this outflowing fuel quantity must be conveyed correspondingly longer during the delivery stroke of the pump piston from the pump work space to the injection nozzles.
- the control of the total fuel quantity to be injected per pump piston delivery stroke is carried out by controlling a relief channel that is opened in the pump piston from an adjustable slide piston stroke that extends from an annular slide that is displaceable on the pump piston to the suction chamber of the fuel injection pump.
- a bypass and a solenoid valve that can be controlled by electrical signals are also required for extending the injection duration.
- the method according to the invention with the characterizing features of the main claim has the advantage that the same control device, by which the fuel injection quantity is determined, the idle time can be extended to reduce noise during idle operation and at low load without the injection start control being disturbed by this influence.
- FIG. 1 shows a fuel injection pump in a simplified representation
- FIG. 2 shows a diagram that shows the time course of the fuel pressure in the pump work space
- FIG. 3 shows a diagram that shows the control current for the control device over time
- FIG. 4 shows a diagram that shows the time course of the fuel pressure in the pump work space for another type of control of the control device
- Figure 5 shows a diagram showing the pulse waveform of the control of the control device.
- a socket 2 in a housing 1 in which a pump piston 3 executes a reciprocating and simultaneously rotating movement.
- the pump piston 3 is driven by a cam drive 4 via a shaft 5, which rotates synchronously with the speed of the internal combustion engine supplied with fuel by the injection pump.
- a pump working space 6 is delimited by the end face of the pump piston 3 and the bushing 2 and is connected via a supply channel 7 to a suction space 8 in the housing 1 of the fuel injection pump.
- the suction chamber 8 is supplied with fuel from a fuel tank 10, for example via a feed pump 9.
- the fuel is distributed via a longitudinal and distributor groove 11 of the pump piston 3, with the pump piston 3 in a corresponding rotational position, to pressure lines 12, which lead via the bushing 2 and the housing 1 to injection nozzles 13 on the internal combustion engine.
- longitudinal grooves 14 on the pump piston 3, which are open towards the end face and thus towards the pump working chamber 6, are provided, via which a connection between the supply channel 7 and the pump working chamber 6 is established during the suction stroke of the pump piston 3.
- a relief duct 16 branches off from the pump work chamber 6 at a location that cannot be influenced by the pump piston 3, which is on the other hand led to the suction side of the pump piston 3 and opens into the supply duct 7, for example.
- valve seat 17 with which a valve closing member 18 cooperates, which serves as part of an electromagnetically actuable control device 20, in particular a solenoid valve, and thus the Cross-section of the relief channel opens or closes.
- the control device 20 is controlled by an electronic control unit 21 as a function of various operating parameters of the internal combustion engine, such as load 22, speed 23, temperature 24 and others.
- the control device 20 determines the start and end of the injection of the fuel injection pump in a known manner during the delivery stroke of the pump piston 3. In the de-energized state of the control device 20, for example, the valve closing member 18 is lifted off the valve seat 17 and thus the relief channel 16 is opened, so that no sufficient pressure can be built up in the pump work chamber 6 to open the injection nozzles 13.
- the valve closing member 18 By energizing the control device 20, the valve closing member 18 is moved toward the valve seat 17, which indicates the start of delivery, and pressure builds up in the pump work chamber 6, and fuel reaches the injection nozzles 13 via the distributor groove 11.
- De-excitation of the control device 20 is synonymous with the end of the delivery, since this opens the valve seat 17 completely and causes a pressure drop in the pump work chamber 6.
- a fuel quantity is injected via one of the injection nozzles 13. This injected fuel quantity represents a partial quantity of the maximum possible fuel quantity conveyed during a delivery stroke of the pump piston 3.
- the control current supplied by the control unit 21 to the control device 20 is only intended to be so be large that the electromagnetic force generated by it only partially shifts the valve closing member 18 towards the valve seat 17, i.e. does not completely block the valve seat 17, so that fuel can continue to flow throttled via the relief channel 16 to the suction chamber 8 via the relief channel 16.
- the control device 20 during the determined lower speed range of the internal combustion engine, there is a pressure curve of the fuel in the pump work chamber 6, as shown in FIG. 2, in which the fuel pressure is denoted by p K and the time by t.
- the injection duration must be extended so that the de-excitation of the control device 20 only at a later point in time t2 takes place as it would be required in a control device 20 that completely closes the relief channel 16 at the time t'2.
- the excitation current I of the control device 20 is plotted over time t, from which it can be seen that, according to the solid curve between the time of excitation t 1 and the time of de-excitation t 2, the holding current when the control device according to the invention is activated in certain lower speed range is smaller than the holding current represented by the dashed curve, which would be required to control the control device 20 for a complete blocking of the relief channel 16.
- control of the control device 20 from time t 1 to time t 2 could take place by means of several individual pulses, for example in the manner shown in FIG. 5 by three individual pulses 26, 27, 28, which results in a fuel pressure p K in the pump work chamber 6, as shown in FIG. 4.
- the lengthening of the injection duration required during the determined lower speed range can be determined in the control unit 21 on the basis of the determined operating parameters of the internal combustion engine or can be called up from stored values.
- control device 20 is to be actuated again in a known manner with a current, by means of the electromagnetically generated force of which the discharge channel 16 is completely blocked for fuel injection quantity control is guaranteed.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fuel-Injection Apparatus (AREA)
- High-Pressure Fuel Injection Pump Control (AREA)
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
Description
Die Erfindung geht aus von einem Verfahren zur Steuerung der Kraftstoffeinspritzmenge nach der Gattung des Hauptanspruchs. Bekanntlich haben die meisten Dieselmotoren im Leerlauf oder niedrigerem Teillastbereich unangenehme harte Verbrennungsgeräusche, die dadurch vermindert werden können, daß die Einspritzdauer in diesem Drehzahlbereich verlängert wird. Bei einer durch die DE-A-30 08 070 bekannten Kraftstoffeinspritzpumpe erfolgt eine Verlängerung der Einspritzdauer in diesem Drehzahlbereich dadurch, daß ein Teil des geförderten Kraftstoffes über einen magnetventilbetätigten Bypass drucklos abfließen kann, so daß zur Erhaltung der Motordrehzahl infolge des erforderlichen Ersatzes dieser abfließenden Kraftstoffmenge entsprechend länger während des Förderhubes des Pumpenkolbens vom Pumpenarbeitsraum zu den Einspritzdüsen gefördert werden muß. Die Steuerung der gesamten pro Pumpenkolbenförderhub zur Einspritzung gelangenden Kraftstoffmenge erfolgt dabei durch Steuerung eines Entlastungskanals der im Pumpenkolben verlaufend von einem auf dem Pumpenkolben verschiebbaren Ringschieber zum Saugraum der Kraftstoffeinspritzpumpe ab einem verstellbaren Pumpenkolbenhub geöffnet wird. Für hier verwirklichte Verlängerung der Einspritzdauer ist außer der Einspritzmengensteuerung durch den Ringschieber auch noch zusätzlich ein Bypass und ein durch elektrische Signale ansteuerbares Magnetventil erforderlich.The invention relates to a method for controlling the fuel injection quantity according to the preamble of the main claim. As is known, most diesel engines have uncomfortable hard combustion noises in the idling or lower part-load range, which can be reduced by extending the injection duration in this speed range. In a fuel injection pump known from DE-A-30 08 070, the injection duration is extended in this speed range in that part of the fuel delivered can flow off without pressure via a solenoid-operated bypass, so that to maintain the engine speed as a result of the necessary replacement of this outflowing fuel quantity must be conveyed correspondingly longer during the delivery stroke of the pump piston from the pump work space to the injection nozzles. The control of the total fuel quantity to be injected per pump piston delivery stroke is carried out by controlling a relief channel that is opened in the pump piston from an adjustable slide piston stroke that extends from an annular slide that is displaceable on the pump piston to the suction chamber of the fuel injection pump. In addition to the injection quantity control by the ring slide, a bypass and a solenoid valve that can be controlled by electrical signals are also required for extending the injection duration.
Das erfindungsgemäße Verfahren mit den kennzeichnenden Merkmalen des Hauptanspruchs hat demgegenüber den Vorteil, daß durch die gleiche Steuervorrichtung, durch die die Kraftstoffeinspritzmenge bestimmt wird, bei Leerlaufbetrieb und bei niederer Last die Einspritzdauer zur Geräuschverminderung verlängerbar ist, ohne daß die Spritzbeginnsteuerung durch diese Einflußnahme gestört wird.The method according to the invention with the characterizing features of the main claim has the advantage that the same control device, by which the fuel injection quantity is determined, the idle time can be extended to reduce noise during idle operation and at low load without the injection start control being disturbed by this influence.
Durch die in dem Unteranspruch aufgeführte Maßnahme ist eine vorteilhafte Weiterbildung und Verbesserung des im Hauptanspruch angegebenen Verfahrens möglich.The measure specified in the subclaim enables advantageous further development and improvement of the method specified in the main claim.
Ausführungsbeispiele der Erfindung sind in der Zeichnung vereinfacht dargestellt und in der nachfolgenden Beschreibung näher erläutert. Es zeigen Figur 1 eine Kraftstoffeinspritzpumpe in vereinfachter Darstellungsweise, Figur 2 ein Diagramm, das den zeitlichen Verlauf des Kraftstoffdruckes im Pumpenarbeitsraum zeigt, Figur 3 ein Diagramm, das den Ansteuerstrom für die Steuervorrichtung über der Zeit zeigt, Figur 4 ein Diagramm, das den zeitlichen Verlauf des Kraftstoffdruckes im Pumpenarbeitsraum für eine andere Art der Ansteuerung der Steuervorrichtung zeigt, Figur 5 ein Diagramm, das den Impulsverlauf der Ansteuerung der Steuervorrichtung zeigt.Embodiments of the invention are shown in simplified form in the drawing and explained in more detail in the following description. FIG. 1 shows a fuel injection pump in a simplified representation, FIG. 2 shows a diagram that shows the time course of the fuel pressure in the pump work space, FIG. 3 shows a diagram that shows the control current for the control device over time, FIG. 4 shows a diagram that shows the time course of the fuel pressure in the pump work space for another type of control of the control device, Figure 5 shows a diagram showing the pulse waveform of the control of the control device.
Bei der in Figur 1 beispielsweise dargestellten Kraftstoffeinspritzpumpe ist in einem Gehäuse 1 eine Buchse 2 angeordnet, in der ein Pumpenkolben 3 eine hin- und hergehende und gleichzeitig rotierende Bewegung ausführt. Der Pumpenkolben 3 ist durch einen Nockentrieb 4 über eine Welle 5 angetrieben, welche synchron zu der Drehzahl der von der Einspritzpumpe mit Kraftstoff versorgten Brennkraftmaschine rotiert. Durch die Stirnfläche des Pumpenkolbens 3 und die Buchse 2 wird ein Pumpenarbeitsraum 6 begrenzt, welcher über einen Versorgungskanal 7 mit einem Saugraum 8 im Gehäuse 1 der Kraftstoffeinspritzpumpe verbunden ist. Der Saugraum 8 wird beispielsweise über eine Förderpumpe 9 mit Kraftstoff aus einem Kraftstoffbehälter 10 versorgt. Aus dem Pumpenarbeitsraum 6 wird über eine Längs- und Verteilernut 11 des Pumpenkolbens 3 der Kraftstoff bei entsprechender Drehstellung des Pumpenkolbens 3 zu Druckleitungen 12 hin verteilt, die über die Buchse 2 und das Gehäuse 1 zu Einspritzdüsen 13 an der Brennkraftmaschine führen. In dem dem Pumpenarbeitsraum 6 zugewandten Endbereich des Pumpenkolbens 3 sind zur Stirnfläche und damit zum Pumpenarbeitsraum 6 hin offene Längsnuten 14 am Pumpenkolben 3 vorgesehen, über die während des Saughubes des Pumpenkolbens 3 eine Verbindung zwischen dem Versorgungskanal 7 und dem Pumpenarbeitsraum 6 hergestellt wird.In the fuel injection pump shown in FIG. 1, for example, there is a
Vom Pumpenarbeitsraum 6 zweigt an einer durch den Pumpenkolben 3 nicht beeinflußbaren Stelle ein Entlastungskanal 16 ab, der andererseits auf die Saugseite des Pumpenkolbens 3 geführt ist und beispielsweise in den Versorgungskanal 7 mündet.A
In dem Entlastungskanal befindet sich ein Ventilsitz 17, mit dem ein Ventilschließglied 18 zusammenarbeitet, das als Teil einer elektromagnetisch betätigbaren Steuervorrichtung 20, insbesondere eines Magnetventiles, dient und damit den Querschnitt des Entlastungskanals öffnet oder verschließt. Die Ansteuerung der Steuervorrichtung 20 erfolgt durch ein elektronisches Steuergerät 21 in Abhängigkeit von verschiedenen Betriebskenngrößen der Brennkraftmaschine wie Last 22, Drehzahl 23, Temperatur 24 und anderen. Durch die Steuervorrichtung 20 werden in bekannter Weise während des Förderhubes des Pumpenkolbens 3 Spritzbeginn und Spritzende der Kraftstoffeinspritzpumpe bestimmt. In nicht erregtem Zustand der Steuervorrichtung 20 ist beispielsweise das Ventilschließglied 18 vom Ventilsitz 17 abgehoben und damit der Entlastungskanal 16 geöffnet, so daß sich im Pumpenarbeitsraum 6 kein zur Öffnung der Einspritzdüsen 13 ausreichender Druck aufbauen kann. Durch Erregung der Steuervorrichtung 20 wird das Ventilschließglied 18 zum Ventilsitz 17 hin bewegt, wodurch der Förderbeginn gekennzeichnet ist, und es erfolgt im Pumpenarbeitsraum 6 ein Druckaufbau, und Kraftstoff gelangt über die Verteilernut 11 zu den Einspritzdüsen 13. Die Entregung der Steuervorrichtung 20 ist gleichbedeutend mit dem Förderende, da hierdurch der Ventilsitz 17 ganz geöffnet wird und ein Druckabfall im Pumpenarbeitsraum 6 erfolgt. In dem Zeitraum zwischen dem Förderbeginn, also dem Erregen der Steuervorrichtung 20, und dem Förderende, also dem Entregen der Steuervorrichtung 20 wird über eine der Einspritzdüsen 13 eine Kraftstoffmenge eingespritzt. Diese eingespritzte Kraftstoffmenge stellt eine Teilmenge der während eines Förderhubes des Pumpenkolbens 3 maximal möglichen geförderten Kraftstoffmenge dar.In the relief channel there is a
Zur Verlängerung der Einspritzdauer im Leerlaufbereich und im niederen Teillastbereich, also etwa in einem bestimmten unteren Drehzahlbereich von etwa 400 bis 1.000 1/min soll nun gemäß der Erfindung der durch das Steuergerät 21 an die Steuervorrichtung 20 gelieferte Steuerstrom nur so groß sein, daß die durch ihn erzeugte elektromagnetische Kraft das Ventilschließglied 18 nur teilweise zum Ventilsitz 17 hin verschiebt, also nicht vollständig den Ventilsitz 17 sperrt, so daß über den Ventilsitz 17 auch weiterhin gedrosselt Kraftstoff über den Entlastungskanal 16 zum Saugraum 8 strömen kann. Für eine derartige Ansteuerung der Steuervorrichtung 20 während des bestimmten unteren Drehzahlbereiches der Brennkraftmaschine ergibt sich ein Druckverlauf des Kraftstoffes im Pumpenarbeitsraum 6, wie er in der Figur 2 dargestellt ist, in der der Kraftstoffdruck mit pK und die Zeit mit t bezeichnet wird. Dadurch, daß während des bestimmten unteren Drehzahlbereiches der Brennkraftmaschine immer ein Teil des vom Pumpenkolben geförderten Kraftstoffes aus dem Pumpenarbeitsraum 6 gedrosselt über den Entlastungskanal 16 abströmen kann, ergibt sich nach der Erregung der Steuervorrichtung 20 zur Zeit t₁ entsprechend der durchgezogenen Linie a ein Druckverlauf, der in seinem größten Wert geringer ist, als wenn die Steuervorrichtung 20 den Entlastungskanal 16 ganz sperren würde, wobei sich ein Druckverlauf mit einem höheren Wert entsprechend der gestrichelten Linie b ergeben würde. Um während des bestimmten unteren Drehzahlbereiches aufgrund des bei der erfindungsgemäßen Ansteuerung der Steuervorrichtung 20 sich ergebenden geringeren Kraftstoffdruckes während des Förderhubes des Pumpenkolbens 3 die erforderliche eingespritzte Kraftstoffmenge zu erzielen, muß die Einspritzdauer verlängert werden, so daß die Entregung der Steuervorrichtung 20 erst zu einem späteren Zeitpunkt t₂ erfolgt, als sie bei einer den Entlastungskanal 16 völlig schliessenden Steuervorrichtung 20 zum Zeitpunkt t'₂ erforderlich wäre.To extend the injection duration in the idling range and in the low partial load range, that is to say in a certain lower speed range of approximately 400 to 1,000 rpm, according to the invention, the control current supplied by the
In der Figur 3 ist der Erregerstrom I der Steuervorrichtung 20 über der Zeit t aufgetragen, woraus zu ersehen ist, daß entsprechend der ausgezogenen Kennlinie zwischen dem Zeitpunkt der Erregung t₁ und dem Zeitpunkt der Entregung t₂ der Haltestrom bei einer Ansteuerung der Steuervorrichtung gemäß der Erfindung im bestimmten unteren Drehzahlbereich kleiner ist, als der durch die gestrichelte Kennlinie dargestellte Haltestrom, der zur Ansteuerung der Steuervorrichtung 20 für ein völliges Sperren des Entlastungskanales 16 erforderlich wäre.In Figure 3, the excitation current I of the
In einer anderen Ausführungsform könnte während eines Förderhubes des Pumpenkolbens 3 in dem bestimmten unteren Drehzahlbereich die Ansteuerung der Steuervorrichtung 20 vom Zeitpunkt t₁ bis zum Zeitpunkt t₂ durch mehrere Einzelimpulse erfolgen, beispielsweise in der in Figur 5 dargestellten Weise durch drei Einzelimpulse 26, 27, 28, wodurch sich ein Kraftstoffdruck pK im Pumpenarbeitsraum 6 ergibt, wie er in der Figur 4 dargestellt ist.In another embodiment, during a delivery stroke of the pump piston 3 in the certain lower speed range, the control of the
Die während des bestimmten unteren Drehzahlbereiches erforderliche Verlängerung der Einspritzdauer kann im Steuergerät 21 anhand der ermittelten Betriebskenngrößen der Brennkraftmaschine bestimmt oder aus abgespeicherten Werten abgerufen werden.The lengthening of the injection duration required during the determined lower speed range can be determined in the
Bei Drehzahlen oberhalb des bestimmten unteren Drehzahlbereiches soll in den beiden durch die Figuren 2, 3 und 4, 5 gekennzeichneten Ausführungsbeispielen wieder in bekannter Weise die Ansteuerung der Steuervorrichtung 20 mit einem Strom erfolgen, durch dessen elektromagnetisch erzeugte Kraft eine vollständige Sperrung des Entlastungskanales 16 zur Kraftstoffeinspritzmengensteuerung gewährleistet wird.At speeds above the certain lower speed range, in the two exemplary embodiments identified by FIGS. 2, 3 and 4, 5, the
Claims (2)
- Method of controlling the amount of injected fuel for internal combustion engines, the pressure necessary for injection being produced in the pump working space (6) of a fuel injection pump by means of a pump plunger (3) and the beginning of delivery and the end of delivery being determined by an electromagnetically actuable control device (20) excitable by an electronic control unit (21) as a function of operating variables of the internal combustion engine, the control deVice (20) being used to control the flow of fuel through a relief passage (16) leading out of the pump working space (6), in the unexcited state of the control device (20) the relief passage (16) being completely opened and, for the purpose of controlling the amount of injected fuel in a predetermined first speed range of the internal combustion engine, the electromagnetically actuable control device (20) being activated with a first electric current by the control unit 821) (sic) during the delivery stroke of the pump plunger (3) in such a way that the relief passage (16) is completely blocked, characterised in that, for controlling the amount of injected fuel in a predetermined second low speed range of the internal combustion engine, the control device (20) is activated during the delivery stroke of the pump plunger (3) with a second current which is slightly smaller than the first current in such a way that, to prolong the duration of injection, the control device (20) does not completely block the relief passage (16) and that the first speed range encompasses the speeds of the internal combustion engine above the second speed range.
- Method according to Claim 1, characterised in that for the purpose of controlling the amount of injected fuel, the control device (20) can be activated during the delivery stroke of the pump plunger (3) in the particular low speed range of the internal combustion engine using a plurality of pulses (26, 27, 28).
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19853507853 DE3507853A1 (en) | 1985-03-06 | 1985-03-06 | METHOD FOR CONTROLLING THE FUEL INJECTION AMOUNT |
| DE3507853 | 1985-03-06 |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| EP0193788A2 EP0193788A2 (en) | 1986-09-10 |
| EP0193788A3 EP0193788A3 (en) | 1989-07-26 |
| EP0193788B1 true EP0193788B1 (en) | 1991-05-15 |
Family
ID=6264318
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP19860102097 Expired - Lifetime EP0193788B1 (en) | 1985-03-06 | 1986-02-18 | Method of controlling an amount of injected fuel |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP0193788B1 (en) |
| JP (1) | JP2513624B2 (en) |
| DE (2) | DE3507853A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6279542B1 (en) | 1996-09-10 | 2001-08-28 | Volvo Lastvagnar Ab | Method and arrangement for controlling the injection pressure of liquid fuel |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3729636A1 (en) * | 1987-09-04 | 1989-03-16 | Bosch Gmbh Robert | METHOD FOR CONTROLLING THE TIME OF HIGH FUEL PRESSURE DELIVERY OF A FUEL INJECTION PUMP |
| DE3819996A1 (en) * | 1988-06-11 | 1989-12-14 | Bosch Gmbh Robert | HYDRAULIC CONTROL DEVICE, IN PARTICULAR FOR FUEL INJECTION SYSTEMS OF INTERNAL COMBUSTION ENGINES |
| GB8913510D0 (en) * | 1989-06-13 | 1989-08-02 | Lucas Ind Plc | Fuel injection pumping apparatus |
| DE3943245A1 (en) * | 1989-12-29 | 1991-07-04 | Bosch Gmbh Robert | FUEL INJECTION PUMP |
| US5231962A (en) * | 1991-09-27 | 1993-08-03 | Nippondenso Co., Ltd. | Fuel injection control system with split fuel injection for diesel engine |
| DE10124510B4 (en) * | 2001-05-19 | 2012-08-16 | Volkswagen Ag | A method for driving a solenoid valve controlled fuel pump of an internal combustion engine |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE6610398U (en) * | 1967-05-03 | 1973-11-29 | Winkelhofer & Soehne Joh | CHAIN. |
| DE3008070A1 (en) * | 1980-03-03 | 1981-09-10 | Robert Bosch Gmbh, 7000 Stuttgart | Pressure relief valve for fuel injection pump - is operated by electromagnet and held closed by fuel pressure |
| DE2931944A1 (en) * | 1979-08-07 | 1981-03-26 | Robert Bosch Gmbh, 70469 Stuttgart | FUEL INJECTION PUMP FOR INTERNAL COMBUSTION ENGINES |
| JPS58183826A (en) * | 1982-04-19 | 1983-10-27 | Toyota Motor Corp | Fuel injection device for internal-combustion engine |
| JPS5932633A (en) * | 1982-08-16 | 1984-02-22 | Nissan Motor Co Ltd | Fuel injection controlling apparatus for diesel engine |
-
1985
- 1985-03-06 DE DE19853507853 patent/DE3507853A1/en active Granted
-
1986
- 1986-02-18 EP EP19860102097 patent/EP0193788B1/en not_active Expired - Lifetime
- 1986-02-18 DE DE8686102097T patent/DE3679217D1/en not_active Expired - Lifetime
- 1986-03-06 JP JP61047475A patent/JP2513624B2/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6279542B1 (en) | 1996-09-10 | 2001-08-28 | Volvo Lastvagnar Ab | Method and arrangement for controlling the injection pressure of liquid fuel |
Also Published As
| Publication number | Publication date |
|---|---|
| DE3507853A1 (en) | 1986-09-11 |
| DE3507853C2 (en) | 1993-01-21 |
| JP2513624B2 (en) | 1996-07-03 |
| EP0193788A2 (en) | 1986-09-10 |
| JPS61207832A (en) | 1986-09-16 |
| DE3679217D1 (en) | 1991-06-20 |
| EP0193788A3 (en) | 1989-07-26 |
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