EP1637723B1 - System zur Versorgung die Brennkraftmaschine eines Kraftfahrzeuges mit Kraftstoff und Kraftstoffdruckregelverfahren für eine solche Brennkraftmaschine - Google Patents

System zur Versorgung die Brennkraftmaschine eines Kraftfahrzeuges mit Kraftstoff und Kraftstoffdruckregelverfahren für eine solche Brennkraftmaschine Download PDF

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Publication number
EP1637723B1
EP1637723B1 EP05300739A EP05300739A EP1637723B1 EP 1637723 B1 EP1637723 B1 EP 1637723B1 EP 05300739 A EP05300739 A EP 05300739A EP 05300739 A EP05300739 A EP 05300739A EP 1637723 B1 EP1637723 B1 EP 1637723B1
Authority
EP
European Patent Office
Prior art keywords
motor
fuel
supply current
pump
rotation speed
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.)
Not-in-force
Application number
EP05300739A
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English (en)
French (fr)
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EP1637723A1 (de
Inventor
Thierry Planas
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Renault SAS
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Renault SAS
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Application filed by Renault SAS filed Critical Renault SAS
Publication of EP1637723A1 publication Critical patent/EP1637723A1/de
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Publication of EP1637723B1 publication Critical patent/EP1637723B1/de
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • F02D41/3082—Control of electrical fuel pumps

Definitions

  • the present invention relates to a system for supplying fuel to an internal combustion engine of a motor vehicle. It also relates to a method for regulating the fuel supply pressure of such an engine.
  • the fuel pump coupled to the engine provides excess power during all other operating phases of the engine.
  • the regulation implemented in the document US 5,842,454 uses a measurement of the rotational speed of the engine, which is representative of the fuel flow, or a measurement of the voltage across the motor, which is representative of the rotational speed of the engine.
  • the regulation implemented in the document US 6,609,501 is based on a comparison between the fuel pressure and a target fuel pressure, a regulation of the engine supply current being implemented as soon as the supply pressure reaches or exceeds the target value. This technique therefore also requires the provision of a pressure sensor forming a switch.
  • the object of the invention is to overcome the drawbacks of the fuel supply systems according to the state of the art by limiting, in particular, the use of sensors to regulate the fuel pressure delivered by the system.
  • a fuel supply system for an internal combustion engine of a motor vehicle comprising a fuel tank, a pump driven by an electric motor and means for regulating the supply current. of the motor.
  • This power system comprises means for measuring the motor supply current, the means for regulating the motor supply current being adapted to regulate the speed of rotation of the motor only by regulating the motor supply current around the motor.
  • a supply current setpoint representative of a fuel pressure level downstream of the pump.
  • This supply system therefore requires only the use of a single sensor and therefore does not require any sensor to, in particular, measure the pressure and / or the flow of fuel downstream of the pump, or to measure the rotational speed motor, or to measure the voltage across the motor of the pump.
  • this solution makes it possible to regulate the pressure downstream of the pump, by implementing a simple regulation of the motor supply current, a flow delivered by the pump, providing a given pressure level downstream. of it, being related to the level of motor power supply.
  • means are provided for calculating the speed of rotation of the motor from a measurement of the motor supply current and for adapting the current setpoint value as a function of the speed. motor rotation.
  • the system comprises means for measuring the frequency of the motor supply current, means for converting the measured frequency into the speed of rotation of the motor and means comparing the rotational speed of the motor resulting from said comparison with at least one rotational speed reference value to adapt the current reference value.
  • the latter further comprises a retention tank housed inside the tank, in which there is a duct connected to the pump and providing an excess fuel return circuit for maintaining a substantially constant fuel level in the holding tank.
  • the fuel return circuit is equipped with a fuel filter.
  • this filter may be arranged downstream of the pump.
  • the speed of rotation of the motor is regulated solely by regulating the motor supply current around a supply current setpoint value representative of a fuel pressure level downstream of the pump.
  • the motor supply current is measured, the rotational speed of the motor is calculated from the measurement of the motor supply current and the current reference value is adapted according to the speed of rotation of the engine.
  • the rotational speed of the motor is calculated by measuring the frequency of the motor supply current and converting the measured frequency into a corresponding rotational speed.
  • FIG. 1 there is shown a fuel supply system according to the invention, designated by the general numerical reference 10.
  • This system is intended for supplying an internal combustion engine of a motor vehicle.
  • This system essentially comprises a tank 12 of fuel, supplying an injection device 14 of a heat engine 16.
  • the tank 12 is internally provided with a fuel retention tank 18 in which is practiced a small orifice 20, that is to say of negligible size relative to the bottom surface of the retention tank 18.
  • the reservoir 12 is also provided with a fuel pump 22 controlled by an external control electronic card 24, or internal, to the tank. It ensures the aspiration of the fuel from the retention tank 18.
  • a pipe 26 connected to the fuel pump 22 and equipped with a fuel filter 28 dives into the retention tank 18.
  • a second pipe 29 extends between the injection system 14 and the pump 22.
  • the second pipe can be equipped with a fuel filter 31 instead of the filter in the retention tank.
  • a fuel return line 32 is provided between the pressure regulator 30 and the retention tank 18 or, alternatively, as shown in dotted lines, directly in the rest of the tank in order to reinject the excess fuel.
  • This pipe makes it possible, by Venturi effect in the tank 20, to keep the level of fuel in the tank 18 substantially constant.
  • the fuel pump 22 comprises an electric motor 34 controlled by the electronic control card 24 and a hydraulic pump 36 driven by the motor 34.
  • the motor supply current 34 is regulated by the control card 24.
  • This card 24 controls the electric motor 34 of the fuel pump only by regulation.
  • the motor supply current which is always powered by a DC voltage, without the use of any sensors.
  • the motor supply current is regulated around a set point capable of obtaining a rotational speed of the motor making it possible to obtain a target current pressure downstream of the pump, and this in function characteristics of the pump binding the pressure as a function of the fuel flow.
  • the characteristics of the pump linking the pressure depending on the flow rate may vary depending on the fuel flow through the pump, the set value is developed or adapted depending on the flow. For this purpose, the value of the motor supply current, which translates the fuel flow through the pump, is used to correct the current setpoint.
  • FIG. 3 shows the block diagram of the electronic control card 24 making it possible to regulate the pump 22.
  • this card 24 comprises a DC voltage converter 38 receiving, as input, a supply voltage Ve delivered by the vehicle's on-board network R and delivering, as output, an output voltage Vs of supplying the motor 34 of the pump 22.
  • this card 24 is associated with a device 40 of measurement of the motor supply current which, as indicated above, reflects the pressure of the current downstream of the pump, according to the characteristics of the pump establishing a pressure level as a function of the flow rate delivered by the pump.
  • the measured current delivered by the measuring member 40 is compared, after filtering by means of an appropriate filtering member 42, with a current reference value CONS by means of a comparator 44.
  • the error thus calculated is presented at the input of a regulator 46 and then at the input of a control stage 48 to produce a control signal S for the voltage converter 38.
  • the voltage converter 38 comprises a set of switching cells based on bipolar transistors, MOSFET transistors, ... driven by pulse width modulation by the control stage 48 so as to obtain a level of target current.
  • the card 24 is completed by a correction stage 50 adapted to correct the current setpoint as a function of the fuel flow, insofar as, as indicated above, the characteristics of the pump binding the pressure Depending on the flow of fuel passing through the pump, and depending on the supply current of the motor 34, the fuel consumption depends on the flow rate. This correction is also based on a measurement of the current delivered by the measuring element 40.
  • the frequency detection stage 52 measures the frequency f of the supply current (step 58).
  • the conversion stage 54 then calculates the rotation speed of the motor (step 60).
  • the rotational speed of the motor is then compared to a reference speed VIT by means of a comparator 62.
  • the difference thus calculated is then presented at the input of a corrector 64 to insert into the result of the comparison between the current measurement. filtered and the current setpoint, a correction component of the current setpoint as a function of the rotational speed of the motor.
  • this compensation makes it possible to adapt the current setpoint to the speed of rotation of the motor and, in particular, to overcome the non-linearities of the fuel pump.
  • the electronic control card In operation, when starting the heat engine, the voltage delivered by the vehicle battery, which is available on the vehicle's on-board system, is applied to the electronic control card. This card then starts the electric motor of the pump and a regulation of the supply current of this motor around a current setpoint representative of the nominal operating pressure of the fuel supply circuit.
  • the current setpoint value can be held fixed throughout the application of the voltage of the onboard network and, therefore, as long as the vehicle is in operation.
  • the control of the electric motor of the pump has been illustrated in an application according to which the motor is a DC electric motor with brush.
  • the direct current is polyphase and frequency-controlled.
  • the rotational speed of the electric motor can therefore be directly deduced from the driving frequency.
  • the current regulation described above applies in turn in parallel to all of the phase currents.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
  • Hybrid Electric Vehicles (AREA)
  • Fuel-Injection Apparatus (AREA)

Claims (5)

  1. System zur Kraftstoffversorgung einer Brennkraftmaschine eines Kraftfahrzeugs, umfassend einen Kraftstoffbehälter (12), eine Pumpe (36), die von einem Elektromotor (34) angetrieben wird, und Mittel (24) zur Regelung des Speisestroms des Motors, Mittel (40) zur Messung des Speisestroms des Motors, wobei die Mittel zur Regelung des Speisestroms des Motors geeignet sind, die Drehzahl des Motors allein durch Regelung des Speisestroms des Motors auf einen Sollwert des Speisestroms (CONS) zu regeln, der für einen Kraftstoffdruckpegel hinter der Pumpe repräsentativ ist, Mittel (52, 54, 62, 64), um die Drehzahl des Motors von einer Messung des Speisestroms des Motors ausgehend zu berechnen, und um den Stromsollwert von der Drehzahl des Motors abhängig anzupassen, dadurch gekennzeichnet, dass es Mittel (52) umfasst, um die Frequenz des Speisestroms des Motors zu messen, Mittel (54), um die gemessene Frequenz in die Drehzahl des Motors umzuwandeln, und Mittel (62), um die Drehzahl des Motors, die aus diesem Vergleich resultiert, mit mindestens einem Drehzahlsollwert zu vergleichen, um den Wert des Stromsollwerts anzupassen.
  2. System nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass es außerdem eine Rückhaltewanne (18) umfasst, die im Behälter untergebracht ist, in welcher eine Leitung angeordnet ist, die mit der Pumpe verbunden ist und die eine Rückleitung für überschüssigen Kraftstoff darstellt, um einen Kraftstofffüllstand in der Rückhaltewanne im Wesentlichen konstant zu halten.
  3. System nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass die Kraftstoffrückleitung mit einem Kraftstofffilter (28) versehen ist.
  4. System nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, dass es außerdem ein Kraftstofffilter (31) umfasst, das hinter der Pumpe angeordnet ist.
  5. Verfahren zur Regelung des Kraftstoffversorgungsdrucks einer Brennkraftmaschine, demgemäß der Speisestrom eines Elektromotors (34) zum Antrieb einer Kraftstoffpumpe geregelt wird, der Speisestrom des Motors gemessen wird, die Drehzahl des Motors von der Messung des Speisestroms des Motors ausgehend berechnet wird und der Stromsollwert von der Drehzahl des Motors abhängig angepasst wird, dadurch gekennzeichnet, dass die Drehzahl des Motors berechnet wird, indem die Frequenz des Speisestroms des Motors gemessen wird und die gemessene Frequenz in eine entsprechende Drehzahl umgewandelt wird.
EP05300739A 2004-09-21 2005-09-09 System zur Versorgung die Brennkraftmaschine eines Kraftfahrzeuges mit Kraftstoff und Kraftstoffdruckregelverfahren für eine solche Brennkraftmaschine Not-in-force EP1637723B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR0409948A FR2875544B1 (fr) 2004-09-21 2004-09-21 Systeme d'alimentation en carburant d'un moteur a combustion interne de vehicule automobile et procede de regulation de la pression d'alimentation en carburant d'un tel moteur

Publications (2)

Publication Number Publication Date
EP1637723A1 EP1637723A1 (de) 2006-03-22
EP1637723B1 true EP1637723B1 (de) 2007-08-22

Family

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Application Number Title Priority Date Filing Date
EP05300739A Not-in-force EP1637723B1 (de) 2004-09-21 2005-09-09 System zur Versorgung die Brennkraftmaschine eines Kraftfahrzeuges mit Kraftstoff und Kraftstoffdruckregelverfahren für eine solche Brennkraftmaschine

Country Status (4)

Country Link
EP (1) EP1637723B1 (de)
AT (1) ATE371104T1 (de)
DE (1) DE602005002102T2 (de)
FR (1) FR2875544B1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108087134A (zh) * 2016-11-23 2018-05-29 通用汽车环球科技运作有限责任公司 用于控制燃油压力的方法和装置

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9528519B2 (en) 2012-10-12 2016-12-27 Continental Automotive Systems, Inc. Pressure control by phase current and initial adjustment at car line
DE102013220607B4 (de) * 2013-10-11 2017-01-05 Continental Automotive Gmbh Vorrichtung und Verfahren zur Reduzierung von Varianten bei Kraftstoffpumpen-Elektroniken
DE102014226259B4 (de) 2014-12-17 2016-12-22 Continental Automotive Gmbh Verfahren zum Betrieb eines Verbrennungsmotors
DE102015207710B4 (de) 2015-04-27 2018-09-27 Continental Automotive Gmbh Verfahren zur Erhöhung der Genauigkeit einer sensorlosen Druckerfassung

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JPS5768529A (en) * 1980-10-14 1982-04-26 Nissan Motor Co Ltd Rotating speed controller for fuel pump
US4756291A (en) 1987-04-27 1988-07-12 Ford Motor Company Pressure control for the fuel system of an internal combustion engine
US5355859A (en) 1993-09-16 1994-10-18 Siemens Automotive L.P. Variable pressure deadheaded fuel rail fuel pump control system
JPH09151823A (ja) 1995-11-28 1997-06-10 Denso Corp 燃料供給装置
WO1998027333A1 (en) 1996-12-17 1998-06-25 Siemens Automotive Corporation Fuel supply system for a vehicle
FR2781012B1 (fr) * 1998-07-13 2001-02-16 Magneti Marelli France Circuit d'alimentation en carburant a pompe electrique pilotee en pression objective, pour moteur a combustion interne
US6609501B2 (en) 2001-04-12 2003-08-26 Walbro Corporation Fuel pressure regulation system

Non-Patent Citations (1)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108087134A (zh) * 2016-11-23 2018-05-29 通用汽车环球科技运作有限责任公司 用于控制燃油压力的方法和装置
CN108087134B (zh) * 2016-11-23 2021-04-02 通用汽车环球科技运作有限责任公司 用于控制燃油压力的方法和装置

Also Published As

Publication number Publication date
FR2875544B1 (fr) 2009-05-15
DE602005002102D1 (de) 2007-10-04
DE602005002102T2 (de) 2008-05-21
ATE371104T1 (de) 2007-09-15
EP1637723A1 (de) 2006-03-22
FR2875544A1 (fr) 2006-03-24

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