EP0733797A2 - A fuel supply system for internal combustion engines - Google Patents

A fuel supply system for internal combustion engines Download PDF

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Publication number
EP0733797A2
EP0733797A2 EP95120481A EP95120481A EP0733797A2 EP 0733797 A2 EP0733797 A2 EP 0733797A2 EP 95120481 A EP95120481 A EP 95120481A EP 95120481 A EP95120481 A EP 95120481A EP 0733797 A2 EP0733797 A2 EP 0733797A2
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EP
European Patent Office
Prior art keywords
pressure
switch
fuel
internal combustion
pressure switch
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.)
Granted
Application number
EP95120481A
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German (de)
French (fr)
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EP0733797B1 (en
EP0733797A3 (en
Inventor
Bernhard Radermacher
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Pierburg GmbH
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Pierburg GmbH
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Publication date
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Publication of EP0733797A3 publication Critical patent/EP0733797A3/en
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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
    • F02M37/00—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
    • F02M37/04—Feeding by means of driven pumps
    • F02M37/08—Feeding by means of driven pumps electrically driven
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D2200/00—Input parameters for engine control
    • F02D2200/02—Input parameters for engine control the parameters being related to the engine
    • F02D2200/06—Fuel or fuel supply system parameters
    • F02D2200/0602—Fuel pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D2250/00—Engine control related to specific problems or objectives
    • F02D2250/31—Control of the fuel pressure
    • 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
    • F02M37/00—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
    • F02M37/04—Feeding by means of driven pumps
    • F02M37/08—Feeding by means of driven pumps electrically driven
    • F02M2037/085—Electric circuits therefor
    • F02M2037/087—Controlling fuel pressure valve

Abstract

The fuel supply system has a pressure reduction regulator (5) downstream of the pressure switch. The reduction pressure of the pressure reduction regulator is lower than the pressure controlled by the pressure switch. The pressure switch includes a large storage volume. The pressure switch has great switch hysteresis relative to a switch (8). When a large volume of fuel is stored, it opens the switch. When there is no fuel, it closes it. The pressure reduction regulator may be set to the induction pressure of the IC engine.

Description

Die Erfindung betrifft ein Brennstoffversorgungssystem für Brennkraftmaschinen nach dem Oberbegriff des Patentanspruchs 1.The invention relates to a fuel supply system for internal combustion engines according to the preamble of claim 1.

Derartige Systeme bestehen aus einer Brennstoffpumpe und einem Druckregler, wobei der Druckregler stromab einer Verteilerleiste angeordnet ist und Überschußbrennstoff in den Brennstofftank abfließen läßt.Such systems consist of a fuel pump and a pressure regulator, the pressure regulator being arranged downstream of a distributor bar and allowing excess fuel to flow off into the fuel tank.

Hierbei arbeitet die Brennstoffpumpe mit großer Fördermenge gegen den geregelten Brennstoffdruck. Bei längerem Leerlauf- und Teillastbetrieb der Brennkraftmaschine wird durch die Motorabwärme erhitzter Brennstoff in großen Mengen in den Tank zurückgefördert, wodurch erhöhter Dampfdruck und Gasblasen im von der Pumpe angesaugten Brennstoff entstehen können.The fuel pump works with a large delivery rate against the regulated fuel pressure. When the internal combustion engine is idling and under partial load for a prolonged period, fuel which is heated by the engine waste heat is returned to the tank in large quantities, which can result in increased vapor pressure and gas bubbles in the fuel drawn in by the pump.

Aus der DE-A1-43 32 446 ist eine Versorgungseinrichtung bekannt, bei der ein zwischen Brennstoffpumpe und Verteilerleiste eingesetzter Druckschalter in Abhängigkeit des Pumpenauslaßdrucks zwischen leitend und nichtleitend schaltet und dadurch die Brennstoffpumpe über eine Regelschaltung mit unterschiedlicher elektrischer Leistung versorgt wird, wenn der Pumpenauslaßdruck einen Schwellwert des Druckschalters über- oder unterschreitet.From DE-A1-43 32 446 a supply device is known in which a pressure switch inserted between the fuel pump and the distributor strip switches between conductive and non-conductive depending on the pump outlet pressure and thereby the fuel pump is supplied with a different electrical power via a control circuit when the pump outlet pressure is one Threshold value of the pressure switch exceeds or falls below.

Bei dieser Einrichtung ist offensichtlich kein Brennstoffrücklauf in den Tank vorgesehen, es ist jedoch mit einer größeren Schwankung des Pumpenauslaßdrucks wegen der erforderlichen Schalthysterese zu rechnen.With this device, obviously no fuel return into the tank is provided, but a larger fluctuation in the pump outlet pressure can be expected due to the required switching hysteresis.

Aus der DE-A1-31 02 983 ist eine Vorrichtung zur Steuerung der Brennstoffzufuhr bekannt, bei der ein Druckregler einen Schalter/Widerstand verstellt, dessen Widerstand von der zurückströmenden Brennstoffmenge abhängig die Leistungszufuhr der Brennstoffpumpe steuert. Auch bei dieser Vorrichtung tritt eine Erhöhung der Brennstofftemperatur im Tank ein und liegt eine größere Pumpendruckschwankung durch die Schalthysterese vor.From DE-A1-31 02 983 a device for controlling the fuel supply is known, in which a pressure regulator adjusts a switch / resistor, the resistance of which depends on the amount of fuel flowing back depending on the power supply of the fuel pump controls. With this device, too, the fuel temperature in the tank increases and there is a greater pump pressure fluctuation due to the switching hysteresis.

Hiervon ausgehend liegt der Erfindung die Aufgabe zugrunde, ein gattungsgemäßes Brennstoffversorgungssystem derart zu gestalten, daß eine verringerte Druckschwankung an der Verteilerleiste vorliegt, keine durch Motorabwärme bewirkte Brennstofftemperaturerhöhung eintritt und darüber hinaus ein Pumpenbetrieb mit insgesamt verringerter Leistungszufuhr erreichbar wird.Proceeding from this, the object of the invention is to design a generic fuel supply system in such a way that there is a reduced pressure fluctuation on the distributor strip, no increase in fuel temperature caused by engine waste heat and, in addition, pump operation with an overall reduced power supply can be achieved.

Diese Aufgabe ist bei dem System nach dem Oberbegriff des Patentanspruchs 1 durch die im Kennzeichen des Anspruchs angegebenen Merkmale gelöst. Vorteilhafte Weiterbildungen der Erfindung sind mit den Merkmalen der Unteransprüche angegeben.This object is achieved in the system according to the preamble of claim 1 by the features specified in the characterizing part of the claim. Advantageous developments of the invention are specified with the features of the subclaims.

Ein Ausführunsbeispiel der Erfindung ist in der Zeichnung dargestellt und wird nachfolgend beschrieben.An exemplary embodiment of the invention is shown in the drawing and is described below.

Diese zeigt:

Fig. 1
ein erfindungsgemäßen Brennstoffversorgungssystem,
Fig. 2
eine Ausbildung des Druckschalters aus Fig. 1.
This shows:
Fig. 1
a fuel supply system according to the invention,
Fig. 2
an embodiment of the pressure switch from FIG. 1.

Fig. 1 zeigt schematisch ein erfindungsgemäßes Brennstoffversorgungssystem für Brennkraftmaschinen, gebildet aus einer Brennstoffpumpe 1 mit elektrischen Anschlüssen, die an einen Brennstofftank 2 angeschlossen ist und über eine Brennstoffdruckleitung 3 zu der Brennkraftmaschine fördert. Im Zuge der Druckleitung 3 ist ein Druckschalter 4 und nachfolgend ein Reduzierdruckregler 5 angeordnet, dessen Ausgangsleitung 6 mit einer Verteilerleiste 7 der Brennkraftmaschine verbunden ist.1 schematically shows a fuel supply system according to the invention for internal combustion engines, formed from a fuel pump 1 with electrical connections, which is connected to a fuel tank 2 and delivers to the internal combustion engine via a fuel pressure line 3. In the course of the pressure line 3 there is a pressure switch 4 and subsequently a reducing pressure regulator 5 arranged, the output line 6 is connected to a distributor bar 7 of the internal combustion engine.

Der Reduzierdruckregler 5 ist so eingestellt, daß der Reduzierdruck geringer als der vom Druckschalter 4 geregelte/eingestellte Druck ist.The reducing pressure regulator 5 is set so that the reducing pressure is lower than the pressure regulated / set by the pressure switch 4.

Durch den Einsatz des Reduzierdruckreglers 5 ist sichergestellt, daß die vom Druckschalter 4 ausgehenden Druckschwankungen in der Brennstoffdruckleitung 3 nicht in die Verteilerleiste 7 durchschlagen.The use of the reducing pressure regulator 5 ensures that the pressure fluctuations in the fuel pressure line 3 emanating from the pressure switch 4 do not penetrate into the distributor rail 7.

Fig. 2 zeigt einen Schnitt des Druckschalters aus Fig. 1. Dieser besteht aus einem Microschalter 8 mit elektrischen Anschlüssen und einem Schalterhebel 9, der durch eine Membranstange 10 in zwei Stellungen, Schalter geöffnet - geschlossen, verstellt werden kann.Fig. 2 shows a section of the pressure switch from Fig. 1. This consists of a microswitch 8 with electrical connections and a switch lever 9, which can be adjusted by a membrane rod 10 in two positions, switch open - closed.

Die Membranstange 10 ist mit einer Membrane 11 verbunden, die eine Speichermembrankammer 12 begrenzt. Diese Speichermembrankammer 12 ist über einen Abzweig 13 mit der Brennstoffdruckleitung 3 verbunden, wobei stromauf des Abzweiges 13 ein Rückschlagventil 14 in der Brennstoffdruckleitung 3 angeordnet ist. Der von der Brennstoffpumpe 1 geförderte Brennstoff gelangt über das Rückschlagventil 14 zu dem Reduzierdruckregler 5 und gleichzeitig in die Speichermembrankammer 12.The membrane rod 10 is connected to a membrane 11 which delimits a storage membrane chamber 12. This storage membrane chamber 12 is connected to the fuel pressure line 3 via a branch 13, a check valve 14 being arranged in the fuel pressure line 3 upstream of the branch 13. The fuel delivered by the fuel pump 1 passes via the check valve 14 to the reducing pressure regulator 5 and at the same time into the storage membrane chamber 12.

Ab Verstellung der Membrane 11 entgegen der Kraft einer Feder 15 herrscht in der Brennstoffdruckleitung 3 ein höherer Druck als der vom Reduzierdruckregler 5 geregelte, damit steht an der Verteilerleiste 7 unter Arbeitsdruck stehender Brennstoff an.From the adjustment of the diaphragm 11 against the force of a spring 15, there is a higher pressure in the fuel pressure line 3 than that regulated by the reducing pressure regulator 5, so that fuel under working pressure is present on the distributor rail 7.

Bei gefüllter Speichermembrankammer 12 verstellt die Membranstange 10 mit einer Anschlagfläche 16 den Schalterhebel 9 in die Stellung "Schalter geöffnet", wodurch die Leistungszufuhr, ggf. über eine Verstärkerschaltung, zur Brennstoffpumpe 1 unterbrochen wird. Diese Unterbrechung wird solange aufrechterhalten, bis die Speichermembrankammer 12 nahezu entleert ist und die Membranstange 10 mit einer anderen Anschlagfläche 17 den Schalterhebel 9 in die Stellung "Schalter geschlossen" gedrückt hat. Damit kann sich der Vorgang wiederholen.When the storage membrane chamber 12 is filled, the membrane rod 10 moves the switch lever 9 into the “switch open” position with a stop surface 16, as a result of which the power supply to the fuel pump 1 is interrupted, possibly via an amplifier circuit. This interruption is maintained until the storage membrane chamber 12 is almost emptied and the membrane rod 10 has pressed the switch lever 9 into the "switch closed" position with another stop surface 17. The process can then be repeated.

Das Rückschlagventil 14 verhindert einen Brennstoffrückfluß über die abgeschaltete Brennstoffpunpe 1. Es versteht sich von selbst, daß jeder Leitungsteil der Brennstoffdruckleitung 3 über Druckentlastungsventile gesichert sein kann, weshalb auf eine diesbezügliche Darstellung verzichtet werden kann. Der Abstand der beiden Anschlagflächen der Membranstange bestimmt in Verbindung mit der Membranverstellung die Schalthysterese. Es kann vorteilhaft sein, daß der Reduzierdruckregler 5 mit dem Ansaugdruck der Brennkraftmaschine beaufschlagt ist. Hierfür ist eine Anschlußleitung 18 vorgesehen.The check valve 14 prevents a backflow of fuel via the switched-off fuel pump 1. It goes without saying that each line part of the fuel pressure line 3 can be secured via pressure relief valves, which is why a representation in this regard can be dispensed with. The distance between the two stop surfaces of the diaphragm rod determines the switching hysteresis in connection with the diaphragm adjustment. It may be advantageous that the reducing pressure regulator 5 is acted upon by the intake pressure of the internal combustion engine. A connecting line 18 is provided for this.

Es kann vorteilhaft sein, wenn vorgesehen ist, daß das Speichervolumen 12 bei abgestellter Brennkraftmaschine durch ein Brennstoffabschaltventil 19 verschlossen ist, das in dem Abzweig 13 angeordnet ist und bei Inbetriebnahme der Brennkraftmaschine öffnet. Diese Maßnahme dient der Sicherheit bei Unfällen, vermindert Brennstoffaustritt, und vermeidet Brennstofflieferung bei abgestellter Brennkraftmaschine aus dem Speichervolumen 12 zur Verteilerleiste 7 bzw. den nicht dargestellten Einspritzventilen, so daß unkontrolliertes Eintreten von Brennstoff in die Brennräume, z. B. bei undichten Ventilen, ausgeschlossen ist (Wasserschlag).It can be advantageous if it is provided that the storage volume 12 is closed when the internal combustion engine is switched off by a fuel shut-off valve 19 which is arranged in the branch 13 and opens when the internal combustion engine is started up. This measure serves for safety in the event of accidents, reduces fuel leakage, and avoids fuel delivery when the internal combustion engine is switched off from the storage volume 12 to the distributor rail 7 or the injection valves (not shown), so that uncontrolled entry of fuel into the combustion chambers, e.g. B. with leaky valves, is excluded (water hammer).

Durch die Abschaltung der Brennstoffpumpe in den Phasen mit gefüllter Speichermembrankammer 12 ergeben sich im Leerlauf- und Teillastbetrieb der Brennkraftmaschine erhebliche Brennstoffeinsparungen gegenüber den Phasen, in denen die Brennstoffpumpe mit größter Förderleistung gegen Druck arbeiten muß. Die Fördermenge der Brennstoffpumpe ist dem Verbrauch der Brennkraftmaschine angepaßt.By switching off the fuel pump in the phases with filled storage membrane chamber 12, there are considerable fuel savings in idle and part-load operation of the internal combustion engine compared to the phases in which the fuel pump must work against pressure with the greatest delivery capacity. The delivery rate of the fuel pump is adapted to the consumption of the internal combustion engine.

Hierbei spielt der schlechte Wirkungsgrad des Elektromotors der Brennstoffpumpe und der des stromerzeugenden Generators eine erhebliche Rolle. Der Schalter kann alternativ aus einem Potentiometer bestehen, wobei dann eine spannungsabhängige Schalteinrichtung vorgesehen ist, die die Leistungszufuhr zur Brennkraftmaschine bei niedriger Spannung am Potentiometer ein- und bei hoher Spannung ausschaltet oder umgekehrt.The poor efficiency of the electric motor of the fuel pump and that of the electricity-generating generator play a significant role here. The switch can alternatively consist of a potentiometer, in which case a voltage-dependent switching device is provided which switches on the power supply to the internal combustion engine at a low voltage on the potentiometer and switches it off at a high voltage or vice versa.

Es versteht sich von selbst, daß die Membrane der vorliegenden Ausführung auch durch einen Kolben ersetzt werden kann.It goes without saying that the membrane of the present embodiment can also be replaced by a piston.

Claims (6)

Brennstoffversorgungssystem für Brennkraftmaschinen, gebildet aus Brennstoffpumpe, Druckschalter und Verteilerleiste/Anschlüssen für Einspritzventile, wobei der Druckschalter die Leistungszufuhr zur Brennstoffpumpe in Abhängigkeit vom Pumpendruck steuert.
dadurch gekennzeichnet,
daß stromab des Druckschalters (4) zusätzlich ein Reduzierdruckregler (5) eingesetzt ist, dessen Reduzierdruck niedriger als der vom Druckschalter (4) geregelte Druck ist.Fuel supply system for internal combustion engines, formed from a fuel pump, pressure switch and distributor strip / connections for injection valves, the pressure switch controlling the power supply to the fuel pump as a function of the pump pressure.
characterized by
that downstream of the pressure switch (4) an additional reducing pressure regulator (5) is used, the reducing pressure of which is lower than the pressure regulated by the pressure switch (4). System nach Anspruch 1,
dadurch gekennzeichnet,
daß der Druckschalter (4) mit einem großen Speichervolumen (12) ausgestattet ist.System according to claim 1,
characterized by
that the pressure switch (4) is equipped with a large storage volume (12). System nach Anspruch 2,
dadurch gekennzeichnet,
daß der Druckschalter (4) in bezug auf einen Schalter (8) eine große Schalthysterese aufweist und bei großem gespeicherten Brennstoffvolumen den Schalter (8) öffnet und bei keinem schließt.System according to claim 2,
characterized by
that the pressure switch (4) has a large switching hysteresis with respect to a switch (8) and opens the switch (8) with a large stored fuel volume and does not close at any. System nach Anspruch 2 oder 3,
dadurch gekennzeichnet,
daß der Druckschalter (4) eine/einen das Speichervolumen begrenzende(n) Membrane/Kolben (11) aufweist, die/der im Zusammenwirken mit einer Stange (10) mit zwei Anschlagflächen (16, 17) die Öffnung und Schließung des Schalters (8) bewirkt.System according to claim 2 or 3,
characterized by
that the pressure switch (4) has a / a diaphragm / piston (11) delimiting the storage volume, which / in cooperation with a rod (10) with two stop surfaces (16, 17) the opening and closing of the switch (8 ) causes. System nach einem der vorstehenden Ansprüche,
dadurch gekennzeichnet,
daß der Reduzierdruckregler (5) mit dem Ansaugdruck der Brennkraftmaschine beaufschlagt ist.System according to one of the preceding claims,
characterized by
that the reducing pressure regulator (5) is acted upon by the intake pressure of the internal combustion engine. System nach einem der vorstehenden Ansprüche,
dadurch gekennzeichnet,
daß das Speichervolumen (12) bei abgestellter Brennkraftmaschine durch ein Brennstoffabschaltventil (19) verschlossen ist.System according to one of the preceding claims,
characterized by
that the storage volume (12) is closed by a fuel shutoff valve (19) when the internal combustion engine is switched off.
EP95120481A 1995-03-23 1995-12-22 A fuel supply system for internal combustion engines Expired - Lifetime EP0733797B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19510494 1995-03-23
DE19510494A DE19510494A1 (en) 1995-03-23 1995-03-23 Fuel supply system for internal combustion engines

Publications (3)

Publication Number Publication Date
EP0733797A2 true EP0733797A2 (en) 1996-09-25
EP0733797A3 EP0733797A3 (en) 1997-04-02
EP0733797B1 EP0733797B1 (en) 1998-07-15

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EP95120481A Expired - Lifetime EP0733797B1 (en) 1995-03-23 1995-12-22 A fuel supply system for internal combustion engines

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US (1) US5765535A (en)
EP (1) EP0733797B1 (en)
DE (2) DE19510494A1 (en)
ES (1) ES2118497T3 (en)

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WO2016066500A1 (en) * 2014-10-31 2016-05-06 Continental Automotive Gmbh Device and method for sensing an operating pressure of a fuel pump for a motor vehicle

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DE10223077B4 (en) * 2002-05-24 2004-05-06 Robert Bosch Gmbh Fuel injection system for internal combustion engines with low pressure accumulators
WO2016066500A1 (en) * 2014-10-31 2016-05-06 Continental Automotive Gmbh Device and method for sensing an operating pressure of a fuel pump for a motor vehicle
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DE19510494A1 (en) 1996-09-26
EP0733797B1 (en) 1998-07-15
DE59502823D1 (en) 1998-08-20
ES2118497T3 (en) 1998-09-16
EP0733797A3 (en) 1997-04-02
US5765535A (en) 1998-06-16

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