FR2801644A1 - Control of electric supply to the actuator of fuel injector for motor vehicle engine, uses pulse-width modulation rather than amplitude modulation to drive injector actuator - Google Patents

Control of electric supply to the actuator of fuel injector for motor vehicle engine, uses pulse-width modulation rather than amplitude modulation to drive injector actuator Download PDF

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Publication number
FR2801644A1
FR2801644A1 FR9915014A FR9915014A FR2801644A1 FR 2801644 A1 FR2801644 A1 FR 2801644A1 FR 9915014 A FR9915014 A FR 9915014A FR 9915014 A FR9915014 A FR 9915014A FR 2801644 A1 FR2801644 A1 FR 2801644A1
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France
Prior art keywords
actuator
control
injector
motor vehicle
electric supply
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Granted
Application number
FR9915014A
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French (fr)
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FR2801644B1 (en
Inventor
Tallec Patrice Le
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PSA Automobiles SA
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Peugeot Citroen Automobiles SA
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Application filed by Peugeot Citroen Automobiles SA filed Critical Peugeot Citroen Automobiles SA
Priority to FR9915014A priority Critical patent/FR2801644B1/en
Publication of FR2801644A1 publication Critical patent/FR2801644A1/en
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Publication of FR2801644B1 publication Critical patent/FR2801644B1/en
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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
    • F02D41/2096—Output circuits, e.g. for controlling currents in command coils for controlling piezoelectric injectors

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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)

Abstract

The electric supply to the actuator in a fuel injector (1) is determined by a computer (2) which determines the electric supply to the actuator (3) to deliver a required quantity of fuel. The electric supply is delivered at constant amplitude, and the fuel delivery determined by modulation of the duration of application of the supply potential.

Description

La présente invention concerne un système de commande de l'alimentation électrique d'un actionneur piézoélectrique d'un injecteur de carbu rant dans un cylindre de moteur de véhicule automobile. The present invention relates to a system for controlling the power supply of a piezoelectric actuator of a fuel injector in a motor vehicle engine cylinder.

On connaît<B>déjà</B> dans l'état de la technique, des systèmes de ce type qui comportent un calculateur de pilotage de moyens d'alimentation électrique de l'actionneur pour contrôler la quantité de carburant injectée dans le cylindre. Already known <B> already </ B> in the state of the art, systems of this type which include a control computer actuator power supply means for controlling the amount of fuel injected into the cylinder.

De façon générale, on utilise dans l'état de la technique, une com mande en modulation d'amplitude de la tension d'alimentation de l'actionneur piézoélectrique pour contrôler la quantité de carburant injectée dans moteur. Generally speaking, an amplitude modulation command of the supply voltage of the piezoelectric actuator is used in the state of the art to control the quantity of fuel injected into the engine.

Cependant, le niveau de bruit de fonctionnement d'un actionneur piézoélectrique est directement lié<B>à</B> la puissance de commande celui-ci et l'on conçoit que plus la puissance de commande est élevée, plus le bruit de fonctionnement est important et atteint rapidement des niveaux inacceptables sur un véhicule de série. However, the operating noise level of a piezoelectric actuator is directly related to the control power thereof and it is conceivable that the higher the control power, the higher the operating noise. is important and quickly reaches unacceptable levels on a production vehicle.

Le but de l'invention est donc de résoudre ces problèmes. The object of the invention is therefore to solve these problems.

<B>A</B> cet effet, l'invention a pour objet un système de commande de l'alimentation électrique d'un actionneur piézoélectrique d'un injecteur de carbu rant dans un cylindre de moteur de véhicule automobile, du type comportant un calculateur de pilotage de moyens d'alimentation électrique de l'actionneur pour contrôler la quantité de carburant injectée dans le cylindre, caractérisé en ce que les moyens d'alimentation comprennent des moyens d'alimentation de Ilactionneur <B>à</B> amplitude constante et en modulation de largeur d'impulsion. For this purpose, the object of the invention is a system for controlling the power supply of a piezoelectric actuator of a fuel injector in a motor vehicle engine cylinder, of the type comprising a control computer for actuator power supply means for controlling the quantity of fuel injected into the cylinder, characterized in that the supply means comprise actuator supply means <B> to </ B> constant amplitude and pulse width modulation.

L'invention sera mieux comprise<B>à</B> la lecture de la description qui va suivre, donnée uniquement<B>à</B> titre d'exemple et faite en se référant aux dessins annexés, sur lesquels<B>:</B> <B>-</B> la Fig.1 représente un schéma synoptique illustrant la structure d'un système de commande selon l'invention<B>;</B> et <B>-</B> la Fig.2 illustre le fonctionnement de celui-ci. The invention will be better understood by reading the description which will follow, given only by way of example and with reference to the appended drawings, in which <B> to </ B> Fig.1 shows a block diagram illustrating the structure of a control system according to the invention, and <B> - </ b> </ b> </ b> </ b> B> Fig.2 illustrates the operation thereof.

On a en effet représenté sur la figure<B>1,</B> un système de commande de l'alimentation électrique d'un actionneur piézoélectrique d'un injecteur de carbu rant dans un cylindre de moteur de véhicule automobile. In FIG. 1, a control system for the power supply of a piezoelectric actuator of a fuel injector in a motor vehicle engine cylinder has indeed been represented.

Sur ces figures, l'actionneur et l'injecteur sont désignés par la réfé rence générale<B>1</B> et un tel système comporte un calculateur 2 de pilotage du fonctionnement de moyens d'alimentation électrique<B>3</B> de l'actionneur pour troler la quantité de carburant injectée dans le cylindre. In these figures, the actuator and the injector are designated by the general reference <B> 1 </ B> and such a system comprises a control computer 2 for controlling the operation of power supply means <B> 3 </ B> of the actuator to troll the amount of fuel injected into the cylinder.

Le calculateur de pilotage 2 reçoit en effet un certain nombre d'informations relatives au fonctionnement du véhicule pour déterminer un ordre pilotage des moyens d'alimentation électrique<B>3</B> afin de contrôler la quantité carburant<B>à</B> injecter dans le cylindre correspondant du moteur afin d'adapter fonctionnement de ce moteur aux conditions de roulage du véhicule. The control computer 2 indeed receives a certain amount of information relating to the operation of the vehicle to determine a control order of the power supply means <B> 3 </ B> in order to control the fuel quantity <B> to </ B> inject into the corresponding cylinder of the engine in order to adapt the operation of this engine to the driving conditions of the vehicle.

Comme cela a été indiqué précédemment, dans l'état de la techni ces moyens d'alimentation comprennent des moyens d'alimentation Vactionneur en modulation d'amplitude, ce qui présente un certain nombre d'inconvénients, notamment au niveau du bruit de fonctionnement de l'actionneur de l'injecteur. As indicated above, in the state of the art, these power supply means comprise amplitude modulating supply means Vacuum, which has a certain number of disadvantages, in particular with regard to the operating noise of the actuator of the injector.

Selon l'invention, ces moyens d'alimentation<B>-3</B> comprennent moyens d'alimentation de l'actionneur<B>à</B> amplitude constante et en modulation largueur d'impulsion de type classique, comme cela est illustré sur la figure ces moyens pouvant ou non être intégrés au calculateur. According to the invention, these supply means <B> -3 </ B> comprise power supply means of the actuator <B> at constant amplitude and in pulse width modulation of conventional type, such as this is illustrated in the figure these means may or may not be integrated into the computer.

Ceci permet alors de réduire le bruit de fonctionnement de l'actionneur piézoélectrique tout en conservant des performances notamment en terme it minimum injecté, équivalentes<B>à</B> celles des systèmes de commande l'état de la technique. This then makes it possible to reduce the operating noise of the piezoelectric actuator while maintaining performances, in particular in terms of minimum injected, equivalent to those of control systems in the state of the art.

Ce système peut trouver des applications pour la commande l'alimentation en carburant des moteurs Diesel avec système d'alimentation rampe commune, mais également sur des moteurs<B>à</B> essence<B>à</B> injection directe exemple.This system can find applications for controlling the fuel supply of diesel engines with common rail feed system, but also on engines <B> to </ B> gasoline <B> to direct injection example .

Claims (1)

<B><U>REVENDICATIONS</U></B> Système de commande de l'alimentation électrique d'un actionneur piézoélectrique d'un injecteur de carburant dans un cylindre moteur de véhi cule automobile, du type comportant un calculateur (2) de pilotage de moyens d'alimentation électrique<B>(3)</B> de l'actionneur<B>(1)</B> pour contrôler quantité de car burant injectée dans le cylindre, caractérisé en ce que les moyens d'alimentation <B>(3)</B> comprennent des moyens d'alimentation de l'actionneur amplitude cons tante et en modulation de largeur d'impulsion. Système selon la revendication<B>1,</B> caractérisé en que les moyens d'alimentation<B>(3)</B> sont intégrés au calculateur (2).<B> <U> CLAIMS </ U> </ B> Control system for the power supply of a piezoelectric actuator of a fuel injector in a motor vehicle engine cylinder, of the type comprising a calculator (2 ) for controlling the power supply means <B> (3) </ B> of the actuator <B> (1) </ B> to control the quantity of fuel injected into the cylinder, characterized in that the means <B> (3) </ B> power supply means comprise means for supplying the constant amplitude actuator and pulse width modulation. System according to claim 1, characterized in that the supply means <B> (3) </ B> are integrated in the computer (2).
FR9915014A 1999-11-29 1999-11-29 SYSTEM FOR CONTROLLING THE ELECTRICAL SUPPLY OF AN ACTUATOR OF A FUEL INJECTOR IN A VEHICLE ENGINE CYLINDER Expired - Fee Related FR2801644B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR9915014A FR2801644B1 (en) 1999-11-29 1999-11-29 SYSTEM FOR CONTROLLING THE ELECTRICAL SUPPLY OF AN ACTUATOR OF A FUEL INJECTOR IN A VEHICLE ENGINE CYLINDER

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR9915014A FR2801644B1 (en) 1999-11-29 1999-11-29 SYSTEM FOR CONTROLLING THE ELECTRICAL SUPPLY OF AN ACTUATOR OF A FUEL INJECTOR IN A VEHICLE ENGINE CYLINDER

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FR2801644A1 true FR2801644A1 (en) 2001-06-01
FR2801644B1 FR2801644B1 (en) 2002-06-21

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4258282A (en) * 1978-05-29 1981-03-24 U.S. Philips Corporation Device for the generation of a control voltage across a piezo-electric positioning element
US4726389A (en) * 1986-12-11 1988-02-23 Aisan Kogyo Kabushiki Kaisha Method of controlling injector valve
JPS63105263A (en) * 1986-10-20 1988-05-10 Nippon Soken Inc Method and device for controlling fuel injection of internal combustion engine
US4798188A (en) * 1986-12-04 1989-01-17 Aisan Kogyo Kabushiki Kaisha Method of controlling injector
US5095256A (en) * 1988-11-29 1992-03-10 Nec Corporation Drive circuit for a piezoelectric actuator
US5466985A (en) * 1993-06-30 1995-11-14 Brother Kogyo Kabushiki Kaisha Method for non-destructively driving a thickness shear mode piezoelectric actuator

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4258282A (en) * 1978-05-29 1981-03-24 U.S. Philips Corporation Device for the generation of a control voltage across a piezo-electric positioning element
JPS63105263A (en) * 1986-10-20 1988-05-10 Nippon Soken Inc Method and device for controlling fuel injection of internal combustion engine
US4798188A (en) * 1986-12-04 1989-01-17 Aisan Kogyo Kabushiki Kaisha Method of controlling injector
US4726389A (en) * 1986-12-11 1988-02-23 Aisan Kogyo Kabushiki Kaisha Method of controlling injector valve
US5095256A (en) * 1988-11-29 1992-03-10 Nec Corporation Drive circuit for a piezoelectric actuator
US5466985A (en) * 1993-06-30 1995-11-14 Brother Kogyo Kabushiki Kaisha Method for non-destructively driving a thickness shear mode piezoelectric actuator

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 012, no. 346 (M - 742) 16 September 1988 (1988-09-16) *

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