EP0427127A1 - Dispositif de commande d'injecteurs de carburant - Google Patents

Dispositif de commande d'injecteurs de carburant Download PDF

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Publication number
EP0427127A1
EP0427127A1 EP19900121007 EP90121007A EP0427127A1 EP 0427127 A1 EP0427127 A1 EP 0427127A1 EP 19900121007 EP19900121007 EP 19900121007 EP 90121007 A EP90121007 A EP 90121007A EP 0427127 A1 EP0427127 A1 EP 0427127A1
Authority
EP
European Patent Office
Prior art keywords
power unit
injector
current
level
unit
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Withdrawn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
EP19900121007
Other languages
German (de)
English (en)
Inventor
Gianluigi Morello
Marco Diaco
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.)
Marelli Europe SpA
Original Assignee
Marelli Autronica SpA
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 Marelli Autronica SpA filed Critical Marelli Autronica SpA
Publication of EP0427127A1 publication Critical patent/EP0427127A1/fr
Withdrawn legal-status Critical Current

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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
    • F02D41/20—Output circuits, e.g. for controlling currents in command coils
    • 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
    • F02D2041/202—Output circuits, e.g. for controlling currents in command coils characterised by the control of the circuit
    • F02D2041/2024—Output circuits, e.g. for controlling currents in command coils characterised by the control of the circuit the control switching a load after time-on and time-off pulses
    • F02D2041/2027—Control of the current by pulse width modulation or duty cycle control
    • 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
    • F02D2041/202—Output circuits, e.g. for controlling currents in command coils characterised by the control of the circuit
    • F02D2041/2031—Control of the current by means of delays or monostable multivibrators

Definitions

  • the present invention relates to control devices for fuel injectors and has been developed with particular attention to its possible use for controlling injectors for internal combustion engines supplied with petrol.
  • the object of the present invention is to provide a control device which reduces dissipation both in the control circuit and in the injector itself by means of so-called "peak & hold" operation.
  • the device according to the invention is intended to act as the control circuit for a load L constituted in actual fact by the excitation winding of an electromagnetically-operated injector (an electro-injector), such as, for example, a petrol injector forming part of a "single-point" injection system.
  • an electromagnetically-operated injector such as, for example, a petrol injector forming part of a "single-point" injection system.
  • the device 1 is intended to supply the injector S according to a so-called "peak & hold" function, that is by making a current I c with a time trace of the type shown by the graph of Figure 3.d pass through the excitation winding of the injector L.
  • the time trace of the current I c which is intended to be repeated for each injection operation, shows: - an initial stage in which the current I c rises rapidly from 0 to a maximum peak value I p (for example, of the order of 4A) dependent on the supply voltage V b of the injector, so as to ensure that the injector is opened fully (time interval t1), - a subsequent reduction stage in which the intensity of the current I c falls (interval t2) to a substantially fixed holding value Im (for example, 1A ⁇ 0.3A), - a holding stage in which the value Im is held so as to ensure that the injector remains open (interval t3), and - a final turn-off stage which should be as rapid and steady as possible, in which the current I c returns to 0.
  • a maximum peak value I p for example, of the order of 4A
  • the injector L as seen by the device 1, constitutes an overall load L defined by a resistance of the order of 1.5-1.7 ohms and by an inductance of the order of 2.88 mH.
  • the injector S is driven by two solid-state power units (typically bipolar or MOSFET power transistors) TR1, TR2 in an arrangement in which the unit TR2 constitutes a low-side power element since, in practice, it is connected in series with the load L between the supply voltage V b and the earth of the circuit so as to control the intensity of the current I c which flows towards the injector L.
  • solid-state power units typically bipolar or MOSFET power transistors
  • the unit TR1 is a high-side power element which, together with a diode D1 connected to it in series, constitutes a feedback branch which is in parallel with the load L and enables the injector current to be recirculated during the holding stage t2, thus achieving a slow discharge of the energy stored in the injector through the diode D1.
  • a Zener diode DZ has its cathode connected to the connecting line between the load L and the unit TR2 and its anode connected to earth.
  • the function of the Zener diode DZ (which in practice is connected in parallel with the unit TR2) is essentially to ensure a rapid discharge during the closure of the injector (interval t4).
  • An analog-digital converter senses the battery voltage V b through a line 3 and supplies a corresponding digital signal to a processing unit (CPU) 4 whose function will be described further below.
  • CPU processing unit
  • a further line 5 is also connected to the analog/digital converter 2 and constitutes the output line of a current sensor 6 which senses the current passing through the unit TR2 (and hence the value of the current I c which passes through the injector L when it is driven by the unit TR2).
  • the processing unit 4 is intended to control the operation of three timers T1, T2 and T3.
  • the timer T1 pilots the unit TR1, whilst the outputs of the timers T2 and T3 converge at an OR-type logic gate 7 whose output in turn pilots the unit TR2.
  • the processing unit 4, as well as the timers T1, T2 and T3, the converter 2 and the logic gate 7, may to advantage be integrated, even partially, in a microprocessor circuit, for example, as respective functions thereof.
  • the time graphs of Figure 3 relate to a single fuel-injection operation started by the unit 4 (time 0 of the time scale on the abscissa) as a result of the receipt of a synchronisation signal generated, according to known criteria, on the input line S.
  • the unit 4 activates the timer T2 causing the activation of the power unit TR2, so that, in practice, the injector L is connected between the battery voltage V b and earth.
  • the duration of the interval t1 is determined by the unit 4 (by means of a simple calculation algorithm stored therein) in dependence on the battery voltage (V b ) which the unit 4 reads by means of the converter 2.
  • this is an open-loop control system: if the voltage V b (which may vary with the charge level of the battery) is known and the desired maximum current level I p (for example, 4 A) is known, the duration of the time interval t1 necessary to reach that current level can be calculated. In general, if V b drops, it will be necessary to increase the duration of the interval t1.
  • the timer T2 is deactivated and the timers T1 and T3 are also kept deactivated. Under these conditions, both the units TRl and TR2 are deactivated (that is, cut off) so that the injector S is discharged through the Zener diode DZ with a rapid decrease in the intensity of the current I c which falls to the holding value I m .
  • the unit 4 When the intensity I c reaches the value I m , which takes place during the interval t2 (whose duration can easily be calculated by the unit 4 on the basis of the battery voltage V b , the duration of t1 and the value of I m to be attained), the unit 4 simultaneously activates the timer T1 (thus activating TR1 and hence the feedback circuit around the load S), whilst the timer T3 (like the unit TR2 controlled thereby through the gate 7) is activated in a pulsed manner, that is, at a fixed frequency (for example 20 KHz) with a selectively variable duty-cycle.
  • a fixed frequency for example 20 KHz
  • the current can thus be recirculated slowly through the diode Dl (the unit TR1 being made conductive) and, at the same time, the value of the current I c flowing through the load L is stabilised around an average level (Im) whose value depends on the duty-cycle set by the timer T3.
  • the current value I c increases when the unit TR2 is conducting and decreases when the unit TR2 is cut off.
  • This stage is maintained continuously throughout the injection interval t3.
  • the current signal detected by the sensor 6 and transferred to the unit 4 by means of the converter 2 enables a fine adjustment of the current.
  • the unit 4 Upon completion of the fuel injection (at the end of the interval t3), the unit 4 once again switches off the timers T1 and T3 and cuts off the units TR1 and TR2, thus facilitating the rapid discharge of the load L through the Zener dioode nz with a consequent rapid fall in the intensity of the current I c to zero (interval t4).
  • the injector S integrates the current which is stabilised, so to speak, around the desired average current I m .
  • the frequency selected is high enough to ensure that the ripple of the average value satisfies the specification (that the ripple is below a given threshold).
  • the duty-cycle generated is varied by the unit 4 in dependence on the battery voltage V b (detected by means of the converter 2) and on the characteristics of the injector L.
  • timers T2 and T3 (which are intended to be activated alternately) could be combined in a single timer element.
  • the circuit described above may be advantageous in terms of simplicity of execution.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)
EP19900121007 1989-11-07 1990-11-02 Dispositif de commande d'injecteurs de carburant Withdrawn EP0427127A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT6796889 1989-11-07
IT67968A IT1238517B (it) 1989-11-07 1989-11-07 Dispositivo di pilotaggio per iniettori, particolarmente per l'alimentazione del combustibile in motori a benzina

Publications (1)

Publication Number Publication Date
EP0427127A1 true EP0427127A1 (fr) 1991-05-15

Family

ID=11306814

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19900121007 Withdrawn EP0427127A1 (fr) 1989-11-07 1990-11-02 Dispositif de commande d'injecteurs de carburant

Country Status (2)

Country Link
EP (1) EP0427127A1 (fr)
IT (1) IT1238517B (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2014020287A (ja) * 2012-07-18 2014-02-03 Denso Corp 燃料噴射制御装置
SE2150641A1 (en) * 2021-05-20 2022-11-21 Scania Cv Ab Method and circuitry for controlling discharge of a solenoid valve

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US453818A (en) * 1891-06-09 William henry murray
FR2345595A1 (fr) * 1976-03-26 1977-10-21 Bosch Gmbh Robert Installation pour la commande, avec un courant regle, d'organes de manoeuvre electromagnetiques
US4213181A (en) * 1978-06-22 1980-07-15 The Bendix Corporation Energy dissipation circuit for electromagnetic injection
US4536818A (en) * 1984-03-02 1985-08-20 Ford Motor Company Solenoid driver with switching during current decay from initial peak current
US4631628A (en) * 1983-06-08 1986-12-23 Chrysler Motors Corporation Electronic fuel injector driver circuit

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US453818A (en) * 1891-06-09 William henry murray
FR2345595A1 (fr) * 1976-03-26 1977-10-21 Bosch Gmbh Robert Installation pour la commande, avec un courant regle, d'organes de manoeuvre electromagnetiques
US4213181A (en) * 1978-06-22 1980-07-15 The Bendix Corporation Energy dissipation circuit for electromagnetic injection
US4631628A (en) * 1983-06-08 1986-12-23 Chrysler Motors Corporation Electronic fuel injector driver circuit
US4536818A (en) * 1984-03-02 1985-08-20 Ford Motor Company Solenoid driver with switching during current decay from initial peak current

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN, vol. 9, no. 67 (M-366)[1790], 27th March 1985; & JP-A-59 200 024 (NIHON DENSHI) 13-11-1984 *

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2014020287A (ja) * 2012-07-18 2014-02-03 Denso Corp 燃料噴射制御装置
US9228526B2 (en) 2012-07-18 2016-01-05 Denso Corporation Fuel injection controller
SE2150641A1 (en) * 2021-05-20 2022-11-21 Scania Cv Ab Method and circuitry for controlling discharge of a solenoid valve
WO2022245269A1 (fr) * 2021-05-20 2022-11-24 Scania Cv Ab Procédé et ensemble circuit de commande de la décharge d'une électrovanne
SE544931C2 (en) * 2021-05-20 2023-01-10 Scania Cv Ab Method and circuitry for controlling discharge of a solenoid valve

Also Published As

Publication number Publication date
IT8967968A0 (it) 1989-11-07
IT8967968A1 (it) 1991-05-07
IT1238517B (it) 1993-08-18

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