EP0837986B1 - Device and process to regulate fuel pressure in a high pressure accumulator - Google Patents

Device and process to regulate fuel pressure in a high pressure accumulator Download PDF

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Publication number
EP0837986B1
EP0837986B1 EP97924873A EP97924873A EP0837986B1 EP 0837986 B1 EP0837986 B1 EP 0837986B1 EP 97924873 A EP97924873 A EP 97924873A EP 97924873 A EP97924873 A EP 97924873A EP 0837986 B1 EP0837986 B1 EP 0837986B1
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EP
European Patent Office
Prior art keywords
pressure
controller
accumulator
fuel
pressure accumulator
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
Application number
EP97924873A
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German (de)
French (fr)
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EP0837986A1 (en
Inventor
Christian Hoffmann
Wendelin KLÜGL
Andreas Hartke
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Siemens AG
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Siemens AG
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/30—Controlling fuel injection
    • F02D41/38—Controlling fuel injection of the high pressure type
    • F02D41/3809—Common rail control systems
    • F02D41/3836—Controlling the fuel pressure
    • F02D41/3845—Controlling the fuel pressure by controlling the flow into the common rail, e.g. the amount of fuel pumped
    • F02D41/3854—Controlling the fuel pressure by controlling the flow into the common rail, e.g. the amount of fuel pumped with elements in the low pressure part, e.g. low pressure pump
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/30—Controlling fuel injection
    • F02D41/38—Controlling fuel injection of the high pressure type
    • F02D41/3809—Common rail control systems
    • F02D41/3836—Controlling the fuel pressure
    • F02D41/3845—Controlling the fuel pressure by controlling the flow into the common rail, e.g. the amount of fuel pumped
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/30—Controlling fuel injection
    • F02D41/38—Controlling fuel injection of the high pressure type
    • F02D41/3809—Common rail control systems
    • F02D41/3836—Controlling the fuel pressure
    • F02D41/3863—Controlling the fuel pressure by controlling the flow out of the common rail, e.g. using pressure relief valves
    • 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
    • F02M63/00—Other 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
    • F02M63/02—Fuel-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
    • F02M63/0225—Fuel-injection apparatus having a common rail feeding several injectors ; Means for varying pressure in common rails; Pumps feeding common rails
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/02—Circuit arrangements for generating control signals
    • F02D41/14—Introducing closed-loop corrections
    • F02D41/1401—Introducing closed-loop corrections characterised by the control or regulation method
    • F02D2041/1409—Introducing closed-loop corrections characterised by the control or regulation method using at least a proportional, integral or derivative controller
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/02—Circuit arrangements for generating control signals
    • F02D41/14—Introducing closed-loop corrections
    • F02D41/1401—Introducing closed-loop corrections characterised by the control or regulation method
    • F02D2041/1413—Controller structures or design
    • F02D2041/1418—Several control loops, either as alternatives or simultaneous
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D2250/00—Engine control related to specific problems or objectives
    • F02D2250/31—Control of the fuel pressure

Definitions

  • the invention relates to a device for controlling the Fuel pressure in a high pressure accumulator according to the Preamble of claim 1 and a method for regulation the fuel pressure in a high pressure accumulator according to the Preamble of claim 5.
  • High-pressure accumulators for fuel are used in common rail injection systems used. This is done by a high pressure pump Pumped fuel into a high pressure accumulator and starting from the high-pressure accumulator, the fuel is the fed to individual injectors. This way, a high injection pressure allows, especially in the Injection of diesel lowers particle emissions.
  • a control device is already known from EP 0 299 337 A2 the fuel pressure in a high pressure accumulator and a method to regulate the fuel pressure in a high pressure accumulator known.
  • This is fuel from a pre-feed pump via an adjustable throttle of a high pressure pump supplied with the fuel in the high pressure accumulator high pressure pumps, the high pressure accumulator fueling to the injectors and via a safety pressure valve has that when a maximum pressure the high pressure accumulator with the fuel tank connects.
  • the adjustable throttle is made by one Control unit depending on the operating parameters of the Internal combustion engine controlled, so that a volume flow control is carried out on the low pressure side.
  • the described device and the described method have the disadvantage that a pressure decrease in the high pressure accumulator can only be done relatively slowly because the adjustable Throttle is not usable for a pressure reduction.
  • the object of the invention is to provide a device for Regulation of the fuel pressure in a high pressure accumulator and a method for controlling the fuel pressure in one To provide high-pressure accumulators that reduce pressure quickly enable and also a good efficiency exhibit.
  • the object of the invention is achieved by the device of Claim 1 and the method of claim 5 solved.
  • the device of claim 1 and the method of claim 5 offer the advantage that quasi-stationary changes in fuel pressure through a low pressure volume flow control be carried out and dynamic changes of the Fuel pressure via a high-pressure pressure control be performed. In this way, the advantage of high efficiency of a low-pressure volume flow control with the advantage of the high dynamics of a high pressure side Pressure control connected and thereby an improved Dynamics compared to a pressure control on the high pressure side achieved increased efficiency.
  • FIG. 1 shows a tank 1, which has a fuel feed line 2 is connected to a feed pump 4.
  • the feed pump 4, which is not adjustable, is via a delivery line 5 and a control valve 3 connected to a high pressure pump 6.
  • the output of the high pressure pump 6 is with a High-pressure accumulator (common rail) connected.
  • the high pressure accumulator 7 has an injection line 8 which leads to a Injector 9 of an internal combustion engine 22 is guided.
  • the High-pressure accumulator 7 is via a pressure control valve 10 and a fuel return line 11 connected to the tank 1.
  • a pressure sensor 12 on the high-pressure accumulator 7 arranged, the via a first measuring line 13 with a is connected to the first controller 14 via a first control line 15 is connected to the control valve 3.
  • the Pressure sensor 12 is also connected via a second measuring line 16 a second controller 17 connected via a second Control line 18 with the pressure control valve 10 in connection stands.
  • the first controller 14 and the second controller 17 are via a first data line 24 or via a second data line 25 connected to a computing unit 23, which also via a third measuring line 26 to the internal combustion engine 22 connected is.
  • the computing unit 23 also has input lines 27 with which various input values such as for example, the accelerator pedal position of the motor vehicle become.
  • a second pressure sensor 21 for Supply of the first controller 14 can be used on the the low pressure side in front of the high pressure pump 6 in the delivery line 5 is arranged and connected to the first controller 14 is.
  • the control valve 3 can thus also after the pressure in the delivery line 5 are regulated.
  • Figure 2 shows an arrangement corresponding to Figure 1, wherein however, instead of the non-adjustable feed pump 4 adjustable feed pump 20 is arranged over the first Control line 15 is controlled by the first controller 14. On Another difference is that the control valve 3 omitted and instead of the control valve 3 a constant throttle 19 between the adjustable feed pump 20 and the high pressure pump 6 is switched. Corresponds in the other details the arrangement of Figure 2 the arrangement of Figure 1, wherein same parts are provided with the same reference numerals.
  • a second pressure sensor 21 for supplying the first controller 14 is used, the one on the low pressure side in front of the high pressure pump 6 in the delivery line 5 is arranged and is connected to the first controller 14.
  • the controllable feed pump 20 can thus also after the pressure be regulated in the delivery line 5.
  • FIG. 3 shows a schematic representation of the control method according to the invention.
  • a target pressure P SOLL is predefined in accordance with the operating state of the internal combustion engine 22.
  • the computing unit 23 based on the operating state of the internal combustion engine 22, which includes, for example, the speed, the load and the exhaust gas values, and using the input data supplied by the input lines 27, such as the position of the accelerator pedal, the target pressure P SOLL determined for the high-pressure accumulator 7, and this dictates a first comparator 31 and a second comparator 32nd
  • the pressure sensor 12 also outputs the current actual pressure of the high-pressure accumulator 7 to the first comparator 31 and to the second comparator 32 as the actual pressure P IST .
  • the gain factor K 0.2% / M pascal, the sampling time T 0 20 msec, the differentiation time T D 10 msec and the integration time T I are preferably 70 msec.
  • the two-point controller 17 switches from its zero value to the current controller intervention u2 (k) when P DIF is above a predetermined value, which is preferably 100 bar.
  • the current regulator engagement of the first and second regulators 14, 17 of the controlled system are fed to 30, wherein the pressure sensor 12 and / or the second pressure sensor 21 detects the pressure in the high-pressure accumulator or before the high-pressure accumulator and when the actual pressure P is connected to the first and to the second Comparators 31, 32 passes on.
  • the first controller 14 forwards the current first control intervention to the control valve 3 and the second controller 17 the current second controller intervention to the pressure valve 10.
  • the first controller 14 controls the controllable feed pump 20 with the current first control intervention, as shown in FIG. 2.
  • the first and second controllers 14, 17 are optionally available as Analog or digital controller implemented.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
  • Feeding And Controlling Fuel (AREA)
  • Safety Valves (AREA)

Description

Die Erfindung betrifft eine Vorrichtung zur Regelung des Kraftstoffdruckes in einem Hochdruckspeicher gemäß dem Oberbegriff des Anspruchs 1 und ein Verfahren zur Regelung des Kraftstoffdruckes in einem Hochdruckspeicher gemäß dem Oberbegriff des Anspruchs 5.The invention relates to a device for controlling the Fuel pressure in a high pressure accumulator according to the Preamble of claim 1 and a method for regulation the fuel pressure in a high pressure accumulator according to the Preamble of claim 5.

Hochdruckspeicher für Kraftstoff werden bei Common-RailEinspritzanlagen verwendet. Dabei wird von einer Hochdruckpumpe Kraftstoff in einen Hochdruckspeicher gepumpt und ausgehend von dem Hochdruckspeicher wird der Kraftstoff den einzelnen Einspritzdüsen zugeführt. Auf diese Weise wird ein hoher Einspritzdruck ermöglicht, der insbesondere bei der Einspritzung von Diesel die Partikelemission erniedrigt.High-pressure accumulators for fuel are used in common rail injection systems used. This is done by a high pressure pump Pumped fuel into a high pressure accumulator and starting from the high-pressure accumulator, the fuel is the fed to individual injectors. This way, a high injection pressure allows, especially in the Injection of diesel lowers particle emissions.

Aus EP 0 299 337 A2 ist bereits eine Vorrichtung zur Regelung des Kraftstoffdruckes in einem Hochdruckspeicher und ein Verfahren zur Regelung des Kraftstoffdruckes in einem Hochdruckspeicher bekannt. Dabei wird Kraftstoff von einer Vorförderpumpe über eine regelbare Drossel einer Hochdruckpumpe zugeführt, die den Kraftstoff in den Hochdruckspeicher mit hohem Druck pumpt, wobei der Hochdruckspeicher den Kraftstoff an die Einspritzdüsen weiterleitet und über ein Sicherheitsdruckventil verfügt, das bei Überschreiten eines maximalen Druckes den Hochdruckspeicher mit dem Kraftstofftank verbindet. Die regelbare Drossel wird von einem Steuergerät in Abhängigkeit von Betriebsparametern der Brennkraftmaschine angesteuert, so daß eine Volumenstromregelung auf der Niederdruckseite durchgeführt wird.A control device is already known from EP 0 299 337 A2 the fuel pressure in a high pressure accumulator and a method to regulate the fuel pressure in a high pressure accumulator known. This is fuel from a pre-feed pump via an adjustable throttle of a high pressure pump supplied with the fuel in the high pressure accumulator high pressure pumps, the high pressure accumulator fueling to the injectors and via a safety pressure valve has that when a maximum pressure the high pressure accumulator with the fuel tank connects. The adjustable throttle is made by one Control unit depending on the operating parameters of the Internal combustion engine controlled, so that a volume flow control is carried out on the low pressure side.

Die beschriebene Vorrichtung und das beschriebene Verfahren haben den Nachteil, daß eine Druckerniedrigung im Hochdruckspeicher nur relativ langsam erfolgen kann, da die regelbare Drossel nicht für eine Druckerniedrigung verwendbar ist.The described device and the described method have the disadvantage that a pressure decrease in the high pressure accumulator can only be done relatively slowly because the adjustable Throttle is not usable for a pressure reduction.

Die Aufgabe der Erfindung beruht darin, eine Vorrichtung zur Regelung des Kraftstoffdruckes in einem Hochdruckspeicher und ein Verfahren zur Regelung des Kraftstoffdruckes in einem Hochdruckspeicher bereitzustellen, die eine schnelle Druckerniedrigung ermöglichen und zudem einen guten Wirkungsgrad aufweisen.The object of the invention is to provide a device for Regulation of the fuel pressure in a high pressure accumulator and a method for controlling the fuel pressure in one To provide high-pressure accumulators that reduce pressure quickly enable and also a good efficiency exhibit.

Die Aufgabe der Erfindung wird durch die Vorrichtung des Anspruchs 1 und das Verfahren des Anspruchs 5 gelöst. Die Vorrichtung des Anspruchs 1 und das Verfahren nach Anspruch 5 bieten den Vorteil, daß quasistationäre Änderungen des Kraftstoffdruckes durch eine niederdruckseitige Volumenstromregelung durchgeführt werden und dynamische Änderungen des Kraftstoffdruckes über eine hochdruckseitige Druckregelung durchgeführt werden. Auf diese Weise wird der Vorteil des hohen Wirkungsgrades einer niederdruckseitigen Volumenstromregelung mit dem Vorteil der hohen Dynamik einer hochdruckseitigen Druckregelung verbunden und dadurch eine verbesserte Dynamik mit einem gegenüber einer hochdruckseitigen Druckregelung erhöhten Wirkungsgrad erzielt.The object of the invention is achieved by the device of Claim 1 and the method of claim 5 solved. The The device of claim 1 and the method of claim 5 offer the advantage that quasi-stationary changes in fuel pressure through a low pressure volume flow control be carried out and dynamic changes of the Fuel pressure via a high-pressure pressure control be performed. In this way, the advantage of high efficiency of a low-pressure volume flow control with the advantage of the high dynamics of a high pressure side Pressure control connected and thereby an improved Dynamics compared to a pressure control on the high pressure side achieved increased efficiency.

Vorteilhafte Ausbildungen und Verbesserungen der Erfindung sind in den Unteransprüchen angegeben.Advantageous developments and improvements of the invention are specified in the subclaims.

Die Erfindung wird anhand der Figuren näher erläutert;
Es zeigen:

Figur 1
einen Hochdruckspeicher mit einem vorgeschalteten Volumenstromregelventil,
Figur 2
einen Hochdruckspeicher mit einer vorgeschalteten regelbaren Förderpumpe, und
Figur 3
eine schematische Darstellung des Regelverfahrens.
The invention is illustrated by the figures;
Show it:
Figure 1
a high-pressure accumulator with an upstream volume flow control valve,
Figure 2
a high pressure accumulator with an upstream adjustable feed pump, and
Figure 3
a schematic representation of the control process.

Figur 1 zeigt einen Tank 1, der über eine Kraftstoffzulaufleitung 2 mit einer Förderpumpe 4 verbunden ist. Die Förderpumpe 4, die nicht regelbar ist, ist über eine Förderleitung 5 und ein Regelventil 3 an einer Hochdruckpumpe 6 angeschlossen. Der Ausgang der Hochdruckpumpe 6 ist mit einem Hochdruckspeicher (Common-Rail) verbunden. Der Hochdruckspeicher 7 weist eine Einspritzleitung 8 auf, die zu einem Injektor 9 einer Brennkraftmaschine 22 geführt ist. Der Hochdruckspeicher 7 ist über ein Druckregelventil 10 und über eine Kraftstoffrückleitung 11 mit dem Tank 1 verbunden.Figure 1 shows a tank 1, which has a fuel feed line 2 is connected to a feed pump 4. The feed pump 4, which is not adjustable, is via a delivery line 5 and a control valve 3 connected to a high pressure pump 6. The output of the high pressure pump 6 is with a High-pressure accumulator (common rail) connected. The high pressure accumulator 7 has an injection line 8 which leads to a Injector 9 of an internal combustion engine 22 is guided. The High-pressure accumulator 7 is via a pressure control valve 10 and a fuel return line 11 connected to the tank 1.

Weiterhin ist am Hochdruckspeicher 7 ein Drucksensor 12 angeordnet, der über eine erste Meßleitung 13 mit einem ersten Regler 14 verbunden ist, der über eine erste Steuerleitung 15 mit dem Regelventil 3 in Verbindung steht. Der Drucksensor 12 ist zudem über eine zweite Meßleitung 16 mit einem zweiten Regler 17 verbunden, der über eine zweite Steuerleitung 18 mit dem Druckregelventil 10 in Verbindung steht.There is also a pressure sensor 12 on the high-pressure accumulator 7 arranged, the via a first measuring line 13 with a is connected to the first controller 14 via a first control line 15 is connected to the control valve 3. The Pressure sensor 12 is also connected via a second measuring line 16 a second controller 17 connected via a second Control line 18 with the pressure control valve 10 in connection stands.

Der erste Regler 14 und der zweite Regler 17 sind über eine erste Datenleitung 24 beziehungsweise über eine zweite Datenleitung 25 mit einer Recheneinheit 23 verbunden, die zudem über eine dritte Meßleitung 26 mit der Brennkraftmaschine 22 verbunden ist. Weiterhin weist die Recheneinheit 23 Eingangsleitungen 27 auf, mit denen verschiedene Eingangswerte wie zum Beispiel die Fahrpedalstellung des Kraftfahrzeugs aufgenommen werden. Anstelle des Drucksensors 12 kann in einer Weiterbildung der Erfindung ein zweiter Drucksensor 21 zur Versorgung des ersten Reglers 14 verwendet werden, der auf der Niederdruckseite vor der Hochdruckpumpe 6 in der Förderleitung 5 angeordnet ist und mit dem ersten Regler 14 verbunden ist. Das Regelventil 3 kann somit auch nach dem Druck in der Förderleitung 5 geregelt werden.The first controller 14 and the second controller 17 are via a first data line 24 or via a second data line 25 connected to a computing unit 23, which also via a third measuring line 26 to the internal combustion engine 22 connected is. The computing unit 23 also has input lines 27 with which various input values such as for example, the accelerator pedal position of the motor vehicle become. Instead of the pressure sensor 12 can in one Development of the invention, a second pressure sensor 21 for Supply of the first controller 14 can be used on the the low pressure side in front of the high pressure pump 6 in the delivery line 5 is arranged and connected to the first controller 14 is. The control valve 3 can thus also after the pressure in the delivery line 5 are regulated.

Figur 2 zeigt eine Anordnung entsprechend Figur 1, wobei jedoch Anstelle der nicht regelbaren Förderpumpe 4 eine regelbare Förderpumpe 20 angeordnet ist, die über die erste Steuerleitung 15 von dem ersten Regler 14 gesteuert wird. Ein weiterer Unterschied besteht darin, daß das Regelventil 3 entfällt und anstelle des Regelventils 3 eine Konstantdrossel 19 zwischen der regelbaren Förderpumpe 20 und der Hochdruckpumpe 6 geschaltet ist. In den weiteren Details entspricht die Anordnung der Figur 2 der Anordnung der Figur 1, wobei gleiche Teile mit gleichen Bezugszeichen versehen sind.Figure 2 shows an arrangement corresponding to Figure 1, wherein however, instead of the non-adjustable feed pump 4 adjustable feed pump 20 is arranged over the first Control line 15 is controlled by the first controller 14. On Another difference is that the control valve 3 omitted and instead of the control valve 3 a constant throttle 19 between the adjustable feed pump 20 and the high pressure pump 6 is switched. Corresponds in the other details the arrangement of Figure 2 the arrangement of Figure 1, wherein same parts are provided with the same reference numerals.

Anstelle des Drucksensors 12 wird in einer Weiterbildung der Erfindung ein zweiter Drucksensor 21 zur Versorgung des ersten Reglers 14 verwendet werden, der auf der Niederdruckseite vor der Hochdruckpumpe 6 in der Förderleitung 5 angeordnet ist und mit dem ersten Regler 14 verbunden ist.In one development, instead of the pressure sensor 12 Invention a second pressure sensor 21 for supplying the first controller 14 are used, the one on the low pressure side in front of the high pressure pump 6 in the delivery line 5 is arranged and is connected to the first controller 14.

Die regelbare Förderpumpe 20 kann somit auch nach dem Druck in der Förderleitung 5 geregelt werden.The controllable feed pump 20 can thus also after the pressure be regulated in the delivery line 5.

Figur 3 zeigt eine schematische Darstellung des erfindungsgemäßen Regelverfahrens. Für den Hochdruckspeicher ist entsprechend dem Betriebszustand der Brennkraftmaschine 22 ein Solldruck PSOLL vorgegeben. In dem folgenden Beispiel wird davon ausgegangen, daß die Recheneinheit 23 aufgrund des Betriebszustandes der Brennkraftmaschine 22, der beispielsweise die Drehzahl, die Last und die Abgaswerte beinhaltet, und unter Verwendung der von den Eingangsleitungen 27 zugeführten Eingangsdaten, wie zum Beispiel die Stellung des Fahrpedals, den Solldruck PSOLL für den Hochdruckspeicher 7 ermittelt und diesen einem ersten Vergleicher 31 und einem zweiten Vergleicher 32 vorgibt.Figure 3 shows a schematic representation of the control method according to the invention. For the high-pressure accumulator, a target pressure P SOLL is predefined in accordance with the operating state of the internal combustion engine 22. In the following example, it is assumed that the computing unit 23, based on the operating state of the internal combustion engine 22, which includes, for example, the speed, the load and the exhaust gas values, and using the input data supplied by the input lines 27, such as the position of the accelerator pedal, the target pressure P SOLL determined for the high-pressure accumulator 7, and this dictates a first comparator 31 and a second comparator 32nd

Der Drucksensor 12 gibt den derzeitigen Istdruck des Hochdruckspeichers 7 ebenfalls an den ersten Vergleicher 31 und an den zweiten Vergleicher 32 als Istdruck PIST. Der erste Vergleicher 31 und der zweite Vergleicher 32 subtrahieren von dem Solldruck den Istdruck und ermitteln daraus einen Differenzdruck PDIF: PSOLL - PIST = PDIF. The pressure sensor 12 also outputs the current actual pressure of the high-pressure accumulator 7 to the first comparator 31 and to the second comparator 32 as the actual pressure P IST . The first comparator 31 and the second comparator 32 subtract the actual pressure from the target pressure and determine a differential pressure P DIF : P SET - P ACTUAL = P DIF .

Der Differenzdruck PDIF wird von dem ersten Vergleicher 31 an den ersten Regler 14, der der Ausführung der Figur 1 das Regelventil 3 oder in der Ausführung der Figur 2 die regelbare Förderpumpe 20 ansteuert, und von dem zweiten Vergleicher 32 an den zweiten Regler 17 geführt, der das Druckregelventil 10 ansteuert. Der erste Regler 14 ist vorzugsweise als PID-Regler ausgeführt, der aus dem Differenzdruck PDIF, der für die folgende Formel als aktuelle Regelabweichung e(k) bezeichnet ist, den aktuellen, ersten Reglereingriff u1(k) nach folgender Vorschrift berechnet:

Figure 00050001
wobei mit

u1(k)
der aktueller Reglereingriff,
u1(k-1)
der letze Reglereingriff,
e(k)
die aktuelle Regelabweichung,
e(k-1)
die vorletzte Regelabweichung,
K
der Verstärkungsfaktor,
T0
die Abtastzeit,
TD
die Differenzierzeit und mit
TI
die Integrierzeit bezeichnet sind.
The differential pressure P DIF is fed from the first comparator 31 to the first controller 14, which controls the control valve 3 in the embodiment of FIG. 1 or the controllable feed pump 20 in the embodiment of FIG. 2, and to the second controller 17 by the second comparator 32 that controls the pressure control valve 10. The first controller 14 is preferably designed as a PID controller, which calculates the current, first controller intervention u1 (k) from the differential pressure P DIF , which is referred to as the current control deviation e (k) for the following formula:
Figure 00050001
being with
u1 (k)
the current control intervention,
u1 (k-1)
the last control intervention,
e (k)
the current control deviation,
e (k-1)
the penultimate control deviation,
K
the gain factor,
T 0
the sampling time,
TD
the differentiation time and with
T I
the integration time are designated.

Dabei betragen vorzugsweise der Verstärkungsfaktor K 0,2%/M pascal, die Abtastzeit T0 20 msek, die Differenzierzeit TD 10 msek und die Integrierzeit TI 70 msek.The gain factor K 0.2% / M pascal, the sampling time T 0 20 msec, the differentiation time T D 10 msec and the integration time T I are preferably 70 msec.

Der zweite Regler 17 ist vorzugsweise als Zweipunkt-Regler ausgeführt, der den aktuellen, zweiten Reglereingriff u2(k) nach folgender Vorschrift berechnet: u2(k) = Te Tz Ky, wobei mit

y
der stationäre Endwert der Sollgröße bei Regler im oberen Schaltpunkt,
K
der Verstärkungsfaktor,
Tz
die Periodendauer und
Te
die Einschaltdauer bezeichnet sind.
The second controller 17 is preferably designed as a two-point controller that calculates the current, second controller intervention u2 (k) according to the following rule: u 2 ( k ) = T e T e.g. Ky , being with
y
the stationary final value of the setpoint for the controller in the upper switching point,
K
the gain factor,
T z
the period and
T e
the duty cycle are designated.

Bei einer bevorzugten Ausführung der Erfindung betragen der stationäre Endwert 60 M pascal, der Verstärkungsfaktor K 0,045 %/M pascal, die Periodendauer Tz 2 msek und die Einschaltdauer 1 msek.In a preferred embodiment of the invention, the final stationary value 60 M pascal, the gain factor K 0.045% / M pascal, the period Tz 2 msec and the Duty cycle 1 msec.

In dem beschriebenen Ausführungsbeispiel schaltet der Zweipunkt-Regler 17 von seinem Nullwert auf den aktuellen Reglereingriff u2(k), wenn PDIF über einem vorgegebenen Wert liegt, der vorzugsweise 100 bar beträgt.In the exemplary embodiment described, the two-point controller 17 switches from its zero value to the current controller intervention u2 (k) when P DIF is above a predetermined value, which is preferably 100 bar.

Der aktuelle Reglereingriff u2(k) des Zweipunkt-Reglers 17 wird in einer bevorzugten Ausführung an den ersten Regler 14 übermittelt, der in Abhängigkeit von dem aktuellen Reglereingriff u2(k) des zweiten Reglers 17 den aktuellen Reglereingriff des ersten Reglers 14 korrigiert oder die Regelung stoppt.The current controller intervention u2 (k) of the two-point controller 17 in a preferred embodiment to the first controller 14 transmitted depending on the current controller intervention u2 (k) of the second controller 17 the current controller intervention of the first controller 14 corrects or the regulation stops.

Der aktuelle Reglereingriff des ersten und des zweiten Reglers 14, 17 werden der Regelstrecke 30 zugeführt, wobei der Drucksensor 12 und/oder der zweite Drucksensor 21 den Druck im Hochdruckspeicher oder vor dem Hochdruckspeicher ermittelt und als Istdruck PIST an den ersten und an den zweiten Vergleicher 31, 32 weitergibt. Wie aus Figur 1 ersichtlich ist, gibt der erste Regler 14 den aktuellen ersten Regeleingriff an das Regelventil 3 und der zweite Regler 17 den aktuellen zweiten Reglereingiff an das Druckventil 10 weiter. In einer weiteren Ausführung der Erfindung regelt der erste Regler 14 mit dem aktuellen ersten Regel eingriff die regelbare Förderpumpe 20, wie in Figur 2 dargestellt.The current regulator engagement of the first and second regulators 14, 17 of the controlled system are fed to 30, wherein the pressure sensor 12 and / or the second pressure sensor 21 detects the pressure in the high-pressure accumulator or before the high-pressure accumulator and when the actual pressure P is connected to the first and to the second Comparators 31, 32 passes on. As can be seen from FIG. 1, the first controller 14 forwards the current first control intervention to the control valve 3 and the second controller 17 the current second controller intervention to the pressure valve 10. In a further embodiment of the invention, the first controller 14 controls the controllable feed pump 20 with the current first control intervention, as shown in FIG. 2.

Der erste und der zweite Regler 14, 17 sind wahlweise als Analog- oder Digitalregler ausgeführt.The first and second controllers 14, 17 are optionally available as Analog or digital controller implemented.

Claims (6)

  1. Device for regulating the fuel pressure in a high-pressure accumulator (7), with a first controller (14) for the volumetric flow in the inflow to a high-pressure pump (6) which is connected to the high-pressure accumulator (7), and with a first pressure sensor (12) which is assigned to the high-pressure accumulator (7) and signals the fuel pressure in the high-pressure accumulator (7) to the first controller (14), a second controller (17) being provided for the fuel pressure in the high-pressure accumulator (7), the first pressure sensor (12) signalling the fuel pressure in the high-pressure accumulator (7) to the second controller (17), the first controller (14) having a continuous control behaviour, and the second controller (17) having a step-by-step control behaviour, characterized in that an output of the second controller (17) is fed to an input of the first controller (14).
  2. Device according to Claim 1, characterized in that a controllable feed pump (20) is provided for regulating the volumetric flow.
  3. Device according to Claim 2, characterized in that a constant throttle (19) is arranged downstream of the controllable feed pump (20).
  4. Device according to Claim 1, characterized in that there is arranged upstream of the high-pressure pump (6) a second pressure sensor (21) which is connected, preferably instead of the first pressure sensor (12), to the first regulator (14) via a measuring line.
  5. Method for regulating the pressure in a high-pressure accumulator (7) for fuel, fuel being supplied to the high-pressure accumulator (7) via a high-pressure pump (6) and fuel being discharged from the said high-pressure accumulator via an injection system (9), the volumetric flow of fuel being regulated upstream of the high-pressure pump (6) in the low-pressure region as a function of the pressure in the high-pressure accumulator (9), in the high-pressure region, the pressure in the high-pressure accumulator (9) being regulated as a function of the pressure in the high-pressure accumulator (9), the volumetric flow of fuel in the low-pressure region being regulated when the pressure in the high-pressure accumulator (7) is lower than a trigger pressure, the pressure in the high-pressure accumulator (7) being regulated when the pressure in the high-pressure accumulator (7) is higher than the trigger pressure, and the volumetric flow being regulated when the pressure in the high-pressure accumulator (7) exceeds the trigger pressure, characterized in that the regulation of volumetric flow is carried out as a function of the pressure regulation.
  6. Method according to Claim 5, characterized in that the trigger pressure is ascertained from a sum of a desired value and of a threshold value.
EP97924873A 1996-05-10 1997-05-02 Device and process to regulate fuel pressure in a high pressure accumulator Expired - Lifetime EP0837986B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19618932 1996-05-10
DE19618932A DE19618932C2 (en) 1996-05-10 1996-05-10 Device and method for regulating the fuel pressure in a high pressure accumulator
PCT/DE1997/000902 WO1997043543A1 (en) 1996-05-10 1997-05-02 Device and process to regulate fuel pressure in a high pressure accumulator

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EP0837986A1 EP0837986A1 (en) 1998-04-29
EP0837986B1 true EP0837986B1 (en) 2001-08-16

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US (1) US5941214A (en)
EP (1) EP0837986B1 (en)
JP (1) JP3731900B2 (en)
DE (2) DE19618932C2 (en)
ES (1) ES2162297T3 (en)
WO (1) WO1997043543A1 (en)

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Also Published As

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ES2162297T3 (en) 2001-12-16
JP3731900B2 (en) 2006-01-05
DE19618932C2 (en) 2001-02-01
JPH11509605A (en) 1999-08-24
US5941214A (en) 1999-08-24
DE59704282D1 (en) 2001-09-20
WO1997043543A1 (en) 1997-11-20
DE19618932A1 (en) 1997-11-20
EP0837986A1 (en) 1998-04-29

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