EP1420156A2 - Ansteuerschaltung für Kraftstoffinjektoren eines Fahrzeugs - Google Patents

Ansteuerschaltung für Kraftstoffinjektoren eines Fahrzeugs Download PDF

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Publication number
EP1420156A2
EP1420156A2 EP03292787A EP03292787A EP1420156A2 EP 1420156 A2 EP1420156 A2 EP 1420156A2 EP 03292787 A EP03292787 A EP 03292787A EP 03292787 A EP03292787 A EP 03292787A EP 1420156 A2 EP1420156 A2 EP 1420156A2
Authority
EP
European Patent Office
Prior art keywords
voltage
injectors
excitation
injector
terminals
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.)
Withdrawn
Application number
EP03292787A
Other languages
English (en)
French (fr)
Other versions
EP1420156A3 (de
Inventor
Christophe Ripoll
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
Original Assignee
Renault SAS
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Renault SAS filed Critical Renault SAS
Publication of EP1420156A2 publication Critical patent/EP1420156A2/de
Publication of EP1420156A3 publication Critical patent/EP1420156A3/de
Withdrawn legal-status Critical Current

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    • 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
    • F02D41/20—Output circuits, e.g. for controlling currents in command coils
    • F02D41/2096—Output circuits, e.g. for controlling currents in command coils for controlling piezoelectric injectors
    • 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
    • F02D41/22—Safety or indicating devices for abnormal conditions
    • F02D41/221—Safety or indicating devices for abnormal conditions relating to the failure of actuators or electrically driven elements
    • 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
    • F02D41/20—Output circuits, e.g. for controlling currents in command coils
    • F02D2041/2086—Output circuits, e.g. for controlling currents in command coils with means for detecting circuit failures
    • F02D2041/2093—Output circuits, e.g. for controlling currents in command coils with means for detecting circuit failures detecting short circuits
    • 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

Definitions

  • the invention relates to the piloting of fuel injectors of internal combustion engines for motor vehicles.
  • the invention relates to a device for piloting of injectors capable of detecting malfunctions likely to appear within these injectors.
  • the free ends of the injector nozzle are often provided with piezoelectric cells, consisting of transducers ultrasonic, which are excited by means of an alternating voltage of high frequency.
  • the excitation voltage is in this case relatively high and can reach or even exceed a hundred volts.
  • the frequency is, as for it, higher than ten KHz.
  • piezoelectric cells can experience a number of malfunctions, which may have relatively harmful consequences for electronic circuits neighbors and thus generate these malfunctions can cause failures in the electronic control circuits used to generate the excitation voltage.
  • the invention is to provide a device for driving injectors with stages piezoelectric of a motor vehicle thermal engine capable of detecting and identifying malfunctions likely to appear within the injectors.
  • the invention therefore relates to a control device motor vehicle resonant fuel injectors, comprising an injector excitation circuit to which are connected piezoelectric cells fitted to the injectors and comprising means for developing a periodic voltage excitation of injectors and cell selection means piezoelectric to be excited.
  • This piloting device also comprises means for measurement of electrical quantities present on the excitation circuit and means for detecting injector malfunctions by analysis of the measured electrical quantities.
  • the means of detection of malfunctions include detection means voltage drops across the injector terminals.
  • the detection means may include means for comparing the voltage at the terminals of each injector with a first threshold value for detecting a short circuit to the injector terminals.
  • the means for detecting malfunctions include means for detecting voltage increases at the terminals of the injectors.
  • the detection means include means for comparing the voltage across a selected injector with a second open circuit detection threshold value in the excitation circuit.
  • the device further includes means for clipping the voltage across the terminals of the piezoelectric cells.
  • the device in addition to detecting malfunctions, is capable of protecting the excitation circuit and means for selecting the injectors.
  • the clipping means include a diode Zener.
  • the excitation circuit includes a DC voltage source, means forming cutting switch controlled at opening and closing by a periodic excitation control signal delivered by a computer injection device capable of regulating a supply voltage of the piezoelectric cells around a set value, the means forming switches supplying the piezoelectric cells.
  • the detection means include means for comparing a representative voltage of the excitation voltage of the injectors with at least one voltage of regulation fault detection threshold.
  • the means for detecting malfunctions are further adapted to detect a faulty injector from a identification of the selected piezoelectric cells.
  • a control device of conventional injectors comprises: a supply stage 10; a stage 12 of excitation of the injectors controlled by a computer injections 14; and a load 16 constituted by the piezoelectric cells injectors that should be excited.
  • the excitation circuit 12 is intended to deliver to each of the selected piezoelectric cells an excitation voltage alternative so as to cause an oscillating opening of the nozzle injectors.
  • the floor 10 power supply consists of a continuous power source, for example a battery on board the motor vehicle or the output of a DC / DC converter.
  • this comprises a first switching switch I1 associated with an inductance of smoothing L1 as well as a second cutting switch I2 associated with a second smoothing inductor L2 and intended to provide a shape wave intended to attack the piezoelectric cells, represented in the form of equivalent capacities C1, C2, C3 and C4.
  • a filtering capacity C as well as a diode D are interposed between switches I1 and I2.
  • selection switches I3, I4, I5 and I6, controlled by the computer 14 are respectively mounted in series on the cells C1, C2, C3 and C4.
  • the computer 14 is duly programmed for trigger activation of switches I1 and I2 for switching of the voltage supplied by the power source 10 at the frequency desired excitation and press the selection switches I3, I4, I5 and I6 so as to apply the waveform thus developed to a selected cell.
  • FIGS. 3a to 3d show the signals of control S1, S2, S3 and S4 applied respectively to the switches I3, I4, I5 and I6 to cause their selective excitation.
  • the device is in a state in which the piezoelectric cell designated by the reference numeral C1 is excited, the control signal S1 being at a high level, the other control signals S2, S3 and S4 being at a low level.
  • the excitation signal applied to the selected piezoelectric cells consists of a train of waves of voltage greater than a hundred volts and frequency higher than ten KHz.
  • FIGS. 5 to 9 Three embodiments of a device for controlling injectors of fuel according to the invention.
  • FIG. 5 a first example of realization of a control device according to the invention, capable of ensuring a detection of short circuits likely to appear in series with a piezoelectric cell of an injector.
  • FIG. 7 another variant of realization capable of ensuring detection of an open circuit appearing on the excitation circuit of the piezoelectric cells.
  • Figure 9 corresponds to a third mode of realization intended to ensure a detection of a regulation failure of voltage.
  • the device for piloting of injectors also includes a power source 10, a circuit excitation 12 comprising first and second switches I1 and I2 of cutting controlled by the injection computer 14 of the vehicle and associated with smoothing inductors L1 and L2, a capacitor of filtering C associated with a diode D being interposed between the switches I1 and I2.
  • the computer 14 controls opening and closing switches I1 and I2 so that cut the supply voltage delivered by stage 10 supply and regulate the supply voltage of the piezoelectric cells around a predetermined set value.
  • piezoelectric cells C1, C2, C3 and C4 these can be selected by means of switches I3, I4, I5 and I6 controlled on opening and closing by the computer 14, as this is known per se.
  • switches I3, I4, I5 and I6 controlled on opening and closing by the computer 14, as this is known per se.
  • the piezoelectric cell designated by the reference C4 is selected.
  • this piezoelectric cell C4 is the seat of a short circuit.
  • the device is provided with a divider bridge, constituted by a series association of two resistors R1 and R2 connected in parallel to the piezoelectric cells C1, C2, C3 and C4, the common node between the two resistors R1 and R2 being presented at the input of the non-inverting terminal of a comparator A, including the terminal reverser receives a first reference voltage VREF1 below from which it is considered that a short circuit has appeared, and the output is connected to an input of the computer 14.
  • a divider bridge constituted by a series association of two resistors R1 and R2 connected in parallel to the piezoelectric cells C1, C2, C3 and C4, the common node between the two resistors R1 and R2 being presented at the input of the non-inverting terminal of a comparator A, including the terminal reverser receives a first reference voltage VREF1 below from which it is considered that a short circuit has appeared, and the output is connected to an input of the computer 14.
  • the device is also provided with means for measurement of the voltage across cells C1, C2, C3 and C4, formed by the association of two resistors R'1 and R'2 and delivering at the non-inverting terminal of a comparator A 'a signal translating the voltage level across a selected cell.
  • Terminal comparator A ' receives a second reference voltage VREF2 higher than the voltage peak appearing at the terminals of cells during normal operation.
  • the circuit is additionally provided with a Zener Z diode in parallel on the cells to clipping the voltage across the cells to avoid any overvoltage.
  • the device performs a comparison of the setpoint steering system is provided with comparison means for carrying out a comparison of an injector control setpoint with the voltage of piloting actually obtained.
  • voltage measurement means constituted by a resistive bridge R “1 and R" 2 are used to measure the tension within of the excitation circuit, in particular between the diode D and the inductance L2.
  • a detection window To detect a regulation fault, use is made of preferably a detection window. So the level of tension measured is presented at the input of two comparators A “1 and A” 2 each making a comparison with a voltage level of high and low reference, respectively VREF3 and VREF4. The exit of these comparators a "1 and a" 2 is presented at the input of a logic gate OR, which is connected, at the output, to the injection computer 14.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)
  • Combined Controls Of Internal Combustion Engines (AREA)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
EP03292787A 2002-11-13 2003-11-06 Ansteuerschaltung für Kraftstoffinjektoren eines Fahrzeugs Withdrawn EP1420156A3 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0214147A FR2847001B1 (fr) 2002-11-13 2002-11-13 Dispositif de pilotage d'injecteurs de carburant pour vehicule automobile
FR0214147 2002-11-13

Publications (2)

Publication Number Publication Date
EP1420156A2 true EP1420156A2 (de) 2004-05-19
EP1420156A3 EP1420156A3 (de) 2005-03-09

Family

ID=32116563

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03292787A Withdrawn EP1420156A3 (de) 2002-11-13 2003-11-06 Ansteuerschaltung für Kraftstoffinjektoren eines Fahrzeugs

Country Status (2)

Country Link
EP (1) EP1420156A3 (de)
FR (1) FR2847001B1 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008061994A1 (de) * 2006-11-23 2008-05-29 Continental Automotive Gmbh Verfahren zur lokalisierung eines fehlerorts innerhalb eines kraftstoffeinspritzsystems
EP1927743A1 (de) * 2006-11-30 2008-06-04 Delphi Technologies, Inc. Fehlerdetektion in einer Injektoranordnung

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102015212371B4 (de) * 2015-07-02 2021-08-05 Vitesco Technologies GmbH Verfahren zur Überwachung des Arbeitsbetriebs eines Piezoinjektors

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19709716A1 (de) * 1997-03-10 1998-05-14 Siemens Ag Ansteuerschaltung für wenigstens ein kapazitives Stellglied
DE19709715A1 (de) * 1997-03-10 1998-05-20 Siemens Ag Vorrichtung und Verfahren zum Ansteuern wenigstens eines kapazitiven Stellgliedes
FR2776087A1 (fr) * 1998-03-11 1999-09-17 Siemens Ag Procede et dispositif de commande d'organes de reglage capacitifs
US6109245A (en) * 1997-03-21 2000-08-29 Siemens Aktiengesellschaft Apparatus and method for driving a piezoelectrically controlled fuel injection valve
DE19927087A1 (de) * 1999-06-15 2000-12-21 Bosch Gmbh Robert Vorrichtung zum Laden und Entladen mehrerer piezoelektrischer Elemente
EP1139443A1 (de) * 2000-04-01 2001-10-04 Robert Bosch GmbH Verfahren und Einrichtung zur Ansteuerung eines piezoelektrischen Kraftstoffeinspritzventils
US20010039484A1 (en) * 1998-09-30 2001-11-08 Hellmut Freudenberg Method and configuration for diagnosis of a capacitive actuator

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19709716A1 (de) * 1997-03-10 1998-05-14 Siemens Ag Ansteuerschaltung für wenigstens ein kapazitives Stellglied
DE19709715A1 (de) * 1997-03-10 1998-05-20 Siemens Ag Vorrichtung und Verfahren zum Ansteuern wenigstens eines kapazitiven Stellgliedes
US6109245A (en) * 1997-03-21 2000-08-29 Siemens Aktiengesellschaft Apparatus and method for driving a piezoelectrically controlled fuel injection valve
FR2776087A1 (fr) * 1998-03-11 1999-09-17 Siemens Ag Procede et dispositif de commande d'organes de reglage capacitifs
US20010039484A1 (en) * 1998-09-30 2001-11-08 Hellmut Freudenberg Method and configuration for diagnosis of a capacitive actuator
DE19927087A1 (de) * 1999-06-15 2000-12-21 Bosch Gmbh Robert Vorrichtung zum Laden und Entladen mehrerer piezoelektrischer Elemente
EP1139443A1 (de) * 2000-04-01 2001-10-04 Robert Bosch GmbH Verfahren und Einrichtung zur Ansteuerung eines piezoelektrischen Kraftstoffeinspritzventils

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008061994A1 (de) * 2006-11-23 2008-05-29 Continental Automotive Gmbh Verfahren zur lokalisierung eines fehlerorts innerhalb eines kraftstoffeinspritzsystems
US8296044B2 (en) 2006-11-23 2012-10-23 Continental Automotive Gmbh Method for the localization of a fault location within a fuel injection system
CN101589216B (zh) * 2006-11-23 2013-04-03 欧陆汽车有限责任公司 用于定位燃料喷射系统内的故障地点的方法
EP1927743A1 (de) * 2006-11-30 2008-06-04 Delphi Technologies, Inc. Fehlerdetektion in einer Injektoranordnung
US7822537B2 (en) 2006-11-30 2010-10-26 Delphi Technologies Holding S.Arl Detection of faults in an injector arrangement

Also Published As

Publication number Publication date
FR2847001A1 (fr) 2004-05-14
EP1420156A3 (de) 2005-03-09
FR2847001B1 (fr) 2007-02-02

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