WO2018065700A2 - Method for maximizing an engine torque - Google Patents

Method for maximizing an engine torque Download PDF

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Publication number
WO2018065700A2
WO2018065700A2 PCT/FR2017/052647 FR2017052647W WO2018065700A2 WO 2018065700 A2 WO2018065700 A2 WO 2018065700A2 FR 2017052647 W FR2017052647 W FR 2017052647W WO 2018065700 A2 WO2018065700 A2 WO 2018065700A2
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WO
WIPO (PCT)
Prior art keywords
representative
signal
correction
cylinders
regulator
Prior art date
Application number
PCT/FR2017/052647
Other languages
French (fr)
Other versions
WO2018065700A3 (en
Inventor
Benoit Verbeke
Fatma LAZGHAB HAROUSSI
Laurent THUILLIER
Cedric LEFEVRE
Original Assignee
Renault S.A.S.
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 S.A.S. filed Critical Renault S.A.S.
Priority to KR1020197013156A priority Critical patent/KR102211809B1/en
Priority to EP17786964.1A priority patent/EP3523531A2/en
Priority to JP2019518477A priority patent/JP2019530825A/en
Priority to CN201780068787.7A priority patent/CN110100085B/en
Publication of WO2018065700A2 publication Critical patent/WO2018065700A2/en
Publication of WO2018065700A3 publication Critical patent/WO2018065700A3/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
    • F02D41/30—Controlling fuel injection
    • F02D41/38—Controlling fuel injection of the high pressure type
    • F02D41/40—Controlling fuel injection of the high pressure type with means for controlling injection timing or duration
    • F02D41/401—Controlling injection timing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D35/00—Controlling engines, dependent on conditions exterior or interior to engines, not otherwise provided for
    • F02D35/02—Controlling engines, dependent on conditions exterior or interior to engines, not otherwise provided for on interior conditions
    • F02D35/023—Controlling engines, dependent on conditions exterior or interior to engines, not otherwise provided for on interior conditions by determining the cylinder pressure
    • 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
    • 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
    • F02D41/1438—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor
    • F02D41/1444—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases
    • F02D41/1446—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases the characteristics being exhaust temperatures
    • 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
    • F02D2041/1432—Controller structures or design the system including a filter, e.g. a low pass or high pass filter
    • 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
    • F02D2250/18—Control of the engine output torque
    • 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
    • F02D41/008—Controlling each cylinder individually
    • 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
    • F02D41/1438—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor
    • F02D41/1486—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor with correction for particular operating conditions
    • F02D41/1488—Inhibiting the regulation
    • 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
    • F02D41/40—Controlling fuel injection of the high pressure type with means for controlling injection timing or duration
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/40—Engine management systems

Definitions

  • the invention relates to a method for maximizing the pressure in the cylinders of an internal combustion engine and an associated regulating device. It finds an advantageous application in a motor vehicle equipped with an internal combustion engine, including a diesel engine.
  • the invention more specifically refers to a method which makes it possible to decline a signal representative of the measurements and a setpoint of a parameter of the motor into a signal representative of an advance correction at the injection.
  • the development of the motors involves taking into account manufacturing dispersions and making injection instructions in order to meet the reliability constraints.
  • the invention furthermore comprises the use, optionally, of a single pressure sensor in the cylinders by motor, or a sensor of pressure for each cylinder of the engine to thus advantageously reduce the margins taken from the theoretical limits.
  • EP 0145480 discloses the use of a measurement of the variation of the pressure in the cylinders by means of piezoelectric devices, but it does not disclose which parameter is regulated to maximize the pressure in the cylinders.
  • the document WO 9015244 provides for regulating a value representative of the ignition advance by means of piston stroke length sensors, or of the piston angle observable with respect to an original position. But this document does not provide for maximizing the maximum pressure in the cylinders, nor for adjusting the pressure in the cylinders around a target value.
  • DE 2952073 proposes a process which automatically compensates for series production dispersions of the engines. This document implements a method that calculates cycle by cycle a maximum pressure value by means of a pressure sensor in the cylinders.
  • the value representative of the maximum of the pressure in the cylinders given by the sensor is sent to a regulator, but it does not have the function of regulating the pressure in the cylinders around a setpoint value.
  • the regulator serves to maximize the engine performance by increasing the work of the air-fuel mixture in the engine cylinders.
  • the invention thus relates to a method of maximizing a torque provided by a motor subject to reliability constraints and cyclic dispersions comprising a regulator adapted to generate a signal representative of a correction of advance to injection at go a signal representative of the measurements of a motor parameter and of a signal representative of a setpoint of the motor parameter. It includes the steps of:
  • the step of defining an instruction of the maximum of the pressure in the cylinders comprises the generation of a signal representative of an instruction of the maximum of the pressure in the cylinders.
  • the step of defining an operating range of the regulator comprises a comparison of the representative values of the engine speed and the engine torque demand with a motor torque threshold adapted to the operation of the engine. regulator.
  • the step of defining an operating range of the regulator comprises a condition for stabilizing a value representative of the maximum of the pressure in the cylinders.
  • the regulation step can be implemented by means of a proportional integral type regulator, said regulator being calibrated so that the signal generated representative of an injection advance correction does not exceed a setpoint value. of the motor parameter.
  • the engine parameter can be the maximum of the pressure in the cylinders.
  • the correction step is implemented by said regulator.
  • the step of correcting the injection advance feeds a control unit. with a signal representative of a bounded correction of the advance to injection.
  • the method may comprise a fuel flow correction step injected in the cylinders of the engine.
  • the injected rate correction step generates a signal representative of a flow rate correction injected to generate additional engine torque.
  • the injected flow rate correction step is performed so as to maintain a constant, or substantially constant, exhaust temperature.
  • the invention also relates to a device for implementing a method of maximizing a torque provided by an engine subject to reliability constraints and cyclic dispersions, comprising a regulator adapted to generate a signal representative of a correction in advance of the inj ection from a signal representative of the measurements of a motor parameter and of a signal representative of a setpoint of the motor parameter.
  • the device comprises a control unit configured to control the inj ection in the cylinders of the motor as a function of a signal representative of a bounded correction of the injection advance and / or a signal representative of a fuel flow correction injected in the cylinders.
  • the torque minimizing device is intended to minimize the pressure in the cylinders of a motor vehicle internal combustion engine subjected to reliability constraints and cyclic dispersions.
  • This device comprises a comparator 1, a regulator 2 receiving an error signal error _P cy imax representative of maximum pressure error in the cylinders. It comprises a pressure sensor 7 adapted to measure the pressure in the engine cylinders, as well as a control unit 6 which controls the injection of an air / fuel mixture into the engine cylinders from a signal Injection timing correction from regulator 2.
  • the method comprises a first step A of defining an operating range of the regulator 2, and a step B of defining a stability criterion of a measurement of a maximum of the pressure in the cylinders.
  • the regulator 2 is capable of implementing a control of the advance to injection.
  • the method comprises a step C of the alignment of the injection advance correction, a step D of calculating the injected fuel flow correction, a step E of calculating a maximum pressure gradient in the ports. cylinders and a filtering step F.
  • the comparator 1 which can be integrated in the regulator 2, compares two inputs adapted to receive a reference setpoint signal _P cy imax representative of a setpoint of a maximum pressure in the cylinders in the vicinity of the neutral position high (TDC) of the piston P and a cy signal representative imax_filtree filtered measures a maximum pressure in the cylinders.
  • the comparator 1 generates from these two inputs an error signal err _P cy imax representative of an error of a maximum pressure in the cylinders.
  • the comparator 1 can calculate this value by means of the following formula:
  • the error signal err_P cy imax representative of the error of the maximum pressure in the cylinders is sent to the regulator 2.
  • the latter is intended to receive a second stability signal stab_P C yimax representative of a state of stability of the measurements of a maximum pressure in the cylinders.
  • This signal must have passed a stability criterion.
  • the method thus implements a step B during which a stability criterion to be satisfied is defined so that the error signal can reach the regulator.
  • the stability criterion is verified by the regulator 2 and is an additional condition to the activation of the latter.
  • the regulator 2 comprises a specific operating range setting a TQI value representative of the engine torque demand and an N value representative of the engine speed. This operating range is defined in step A.
  • an activation condition requires, for example, that the TQI value representative of the engine torque demand is substantially close to a threshold Cmax representative of a motor torque adapted to the operation of the regulator.
  • the regulator 2 is, for example, an integral proportional type regulator, in particular with a low proportional term, which makes it possible to carry out a closed-loop servocontrol of the setpoint of a maximum pressure in the cylinders. It is calibrated so as not to exceed the setpoint.
  • the regulator 2 outputs a correction signal corr_assemble representative of a correction advance injection.
  • the injection timing correction is bounded during step C of the timing of the injection timing correction to ensure a sufficiently slow dynamic of the injection timing correction.
  • the modification of the injection advance has an effect on the exhaust temperature T av t.
  • the higher the injection advance the lower the exhaust temperature.
  • the invention provides advantageously, in a step D, to calculate for each variation of the advance to the inj ection fuel flow patch inj ected maintaining exhaust temperature T av t substantially constant during the cycles in the goal of gaining extra engine torque.
  • This calculation can be performed by a calculation unit not shown in the appended figure, which can be integrated in the control unit 6, and which generates a correction signal corr_debit representative of the injected flow correction.
  • the cylindrical pressure sensor 7 measures the pressure in the cylinders at each cycle.
  • the operating range of the regulator advantageously makes it possible to overcome the disadvantage of the filtering delay.
  • the grad_P cy imax gradient of the maximum pressure value Pcyimax during step E is calculated to define a criterion of stability of the measurements, and thus advantageously to guarantee the low dynamics of the system.
  • a stability signal stab_P cy imax is generated and is transmitted to the regulator 2 so as to carry out a cycle which repeats iteratively as long as the engine is running.
  • the regulator is a conventional regulator PID (proportional integral derivator), but then has the disadvantage of generating setpoint overruns.
  • the criterion of operation of the regulator comprises a condition on a gradient of engine torque and engine speed.

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  • 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)
  • Combined Controls Of Internal Combustion Engines (AREA)

Abstract

The invention relates to a method for maximizing a torque supplied by an engine that is subject to reliability constraints and operating-cycle variations, using a controller (2) suitable for producing a signal representative of an injection advance correction on the basis of a signal (P cylmax ) representative of measurements of an engine parameter and a signal (setpoint_P cylmax ) representative of an engine parameter setpoint. The method in particular comprises the steps of: - defining a maximum cylinder pressure setpoint (setpoint_P cylmax ); - defining an operating range for the controller (2); - defining a stability criterion for the measurement of a maximum cylinder pressure (P cylmax ) ; - controlling the injection advance; and - correcting the injection advance.

Description

PROCEDE DE MAXIMISATION D 'UN COUPLE MOTEUR  METHOD FOR MAXIMIZING AN ENGINE TORQUE
L 'invention concerne un procédé de maximisation de la pression dans les cylindres d'un moteur à combustion interne et un dispositif de régulation associé. Elle trouve une application avantageuse dans un véhicule automobile équipé d'un moteur à combustion interne, notamment un moteur diesel. The invention relates to a method for maximizing the pressure in the cylinders of an internal combustion engine and an associated regulating device. It finds an advantageous application in a motor vehicle equipped with an internal combustion engine, including a diesel engine.
L 'invention se réfère, plus précisément, à un procédé qui permet de décliner un signal représentatif des mesures et d'une consigne d'un paramètre du moteur en un signal représentatif d' une correction d' avance à l 'inj ection.  The invention more specifically refers to a method which makes it possible to decline a signal representative of the measurements and a setpoint of a parameter of the motor into a signal representative of an advance correction at the injection.
La mise au point des moteurs, pour atteindre des performances demandées, implique la prise en compte de dispersions de fabrication et de réalisation de consignes d' inj ection afin de respecter les contraintes de fiabilité.  The development of the motors, to achieve the required performance, involves taking into account manufacturing dispersions and making injection instructions in order to meet the reliability constraints.
Aujourd' hui, ces contraintes sont respectées en se donnant des marges sur les performances obtenues sur un moteur de référence dit « nominal ».  Today, these constraints are respected by giving margins on the performance obtained on a so-called "nominal" reference engine.
Le maximum des cycles de pression régnant dans les cylindres est contrôlé de manière à respecter ces marges. Il en résulte pour la majorité des moteurs fabriqués, une sous-exp loitation du potentiel de performance de chaque moteur fabriqué qui dépend de la manière dont le maximum des cycles de pression est défini pour chaque moteur.  The maximum pressure cycles prevailing in the cylinders are controlled so as to respect these margins. As a result, for the majority of the engines manufactured, the performance potential of each engine manufactured is under-expended, depending on how the maximum pressure cycles are defined for each engine.
On souhaite réduire cette marge imposée par rapport à la pression maximale dans les cylindres autorisée par le cahier des charges du moteur « nominal » en exploitant, en temps réel, une mesure de la pression dans les cylindres, et notamment du maximum de la pression dans les cylindres de chaque cycle de pression.  It is desired to reduce this imposed margin with respect to the maximum pressure in the cylinders authorized by the specifications of the "nominal" engine by exploiting, in real time, a measurement of the pressure in the cylinders, and in particular the maximum of the pressure in the cylinders. the cylinders of each pressure cycle.
En particulier, il s ' agit de réguler à la limite de la fiabilité le maximum de la pression dans les cylindres, c ' est-à-dire en évitant tout dépassement de la pression maximale dans les cylindres autorisée par le cahier des charges .  In particular, it is a question of regulating the maximum of the pressure in the cylinders to the limit of reliability, that is to say avoiding any exceeding of the maximum pressure in the cylinders authorized by the specifications.
L 'invention comprend en outre l 'utilisation, au choix, d 'un seul capteur de pression dans les cylindres par moteur, ou d'un capteur de pression pour chaque cylindre du moteur pour permettre de réduire ainsi avantageusement les marges prises par rapport aux limites théoriques . The invention furthermore comprises the use, optionally, of a single pressure sensor in the cylinders by motor, or a sensor of pressure for each cylinder of the engine to thus advantageously reduce the margins taken from the theoretical limits.
Des so lutions sont déj à décrites dans le document US 8942912 pour résoudre les problèmes de dispersion d' émissions polluantes à partir d'une augmentation temporaire de la pression dans les cylindres . Cette méthode n' est pas applicable pour un régime moteur stationnaire car elle présenterait l' inconvénient de dégrader prématurément le moteur.  Solutions are already described in US 8942912 for solving pollutant dispersion problems from a temporary increase in cylinder pressure. This method is not applicable for a stationary engine speed because it would have the disadvantage of prematurely degrading the engine.
Le document EP 0145480 divulgue l ' emploi d'une mesure de la variation de la pression dans les cylindres au moyen de dispositifs piézo-électriques, mais il ne divulgue pas quel paramètre est régulé pour maximiser la pression dans les cylindres .  EP 0145480 discloses the use of a measurement of the variation of the pressure in the cylinders by means of piezoelectric devices, but it does not disclose which parameter is regulated to maximize the pressure in the cylinders.
Le document WO 9015244 prévoit de réguler une valeur représentative de l ' avance à l ' allumage au moyen de capteurs de longueur de la course du piston, ou de l ' angle du piston observable par rapport à une position d ' origine. Mais ce document ne prévoit ni de maximiser le maximum de la pression dans les cylindres, ni de régler la pression dans les cylindres autour d 'une valeur cible.  The document WO 9015244 provides for regulating a value representative of the ignition advance by means of piston stroke length sensors, or of the piston angle observable with respect to an original position. But this document does not provide for maximizing the maximum pressure in the cylinders, nor for adjusting the pressure in the cylinders around a target value.
Le document DE 2952073 propose un procédé qui compense de manière automatique des dispersions de fabrication de série des moteurs. Ce document met en œuvre un procédé qui calcule cycle par cycle une valeur de pression maximum au moyen d'un capteur de pression dans les cylindres.  DE 2952073 proposes a process which automatically compensates for series production dispersions of the engines. This document implements a method that calculates cycle by cycle a maximum pressure value by means of a pressure sensor in the cylinders.
La valeur représentative du maximum de la pression dans les cylindres donnée par le capteur est envoyée à un régulateur, mais celui-ci n' a pas pour fonction de réguler la pression dans les cylindres autour d'une valeur consigne. Le régulateur sert à maximiser la performance du moteur en augmentant le travail du mélange air- carburant dans les cylindres du moteur.  The value representative of the maximum of the pressure in the cylinders given by the sensor is sent to a regulator, but it does not have the function of regulating the pressure in the cylinders around a setpoint value. The regulator serves to maximize the engine performance by increasing the work of the air-fuel mixture in the engine cylinders.
L 'invention porte donc sur un procédé de maximisation d 'un couple fourni par un moteur soumis à des contraintes de fiabilité et des dispersions cycliques comprenant un régulateur adapté pour générer un signal représentatif d'une correction d' avance à l' inj ection à partir d'un signal représentatif des mesures d'un paramètre du moteur et d'un signal représentatif d'une consigne du paramètre du moteur. Il comprend les étapes de : The invention thus relates to a method of maximizing a torque provided by a motor subject to reliability constraints and cyclic dispersions comprising a regulator adapted to generate a signal representative of a correction of advance to injection at go a signal representative of the measurements of a motor parameter and of a signal representative of a setpoint of the motor parameter. It includes the steps of:
- définition d 'une consigne de maximum de la pression dans les cylindres ;  - Definition of a setpoint of maximum pressure in the cylinders;
- définition d'une plage de fonctionnement dudit régulateur ; définition d'un critère de stabilité d'une mesure du maximum de la pression dans les cylindres ;  defining an operating range of said regulator; defining a stability criterion of a measurement of the maximum pressure in the cylinders;
régulation de l ' avance à l ' inj ection ; et  regulation of advance to injection; and
correction de l ' avance à l ' inj ection.  correction of the injection advance.
Selon un mode de mise en œuvre du procédé, l ' étape de définition d 'une consigne du maximum de la pression dans les cylindres comprend la génération d'un signal représentatif d' une consigne du maximum de la pression dans les cylindres .  According to one embodiment of the method, the step of defining an instruction of the maximum of the pressure in the cylinders comprises the generation of a signal representative of an instruction of the maximum of the pressure in the cylinders.
Selon un autre mode de mise en œuvre du procédé, l ' étape de définition d 'une plage de fonctionnement du régulateur comprend une comparaison des valeurs représentatives du régime moteur et de la demande de couple moteur à un seuil de couple moteur adapté au fonctionnement du régulateur.  According to another embodiment of the method, the step of defining an operating range of the regulator comprises a comparison of the representative values of the engine speed and the engine torque demand with a motor torque threshold adapted to the operation of the engine. regulator.
Dans un mode de mise en œuvre, l ' étape de définition d 'une plage de fonctionnement du régulateur comprend une condition de stabilisation d'une valeur représentative du maximum de la pression dans les cylindres.  In one embodiment, the step of defining an operating range of the regulator comprises a condition for stabilizing a value representative of the maximum of the pressure in the cylinders.
L ' étape de régulation peut être mise en œuvre au moyen d 'un régulateur de type proportionnel intégral, ledit régulateur étant calibré pour que le signal généré représentatif d'une correction d' avance à l' inj ection ne dépasse pas une valeur de consigne du paramètre du moteur.  The regulation step can be implemented by means of a proportional integral type regulator, said regulator being calibrated so that the signal generated representative of an injection advance correction does not exceed a setpoint value. of the motor parameter.
En outre, le paramètre du moteur peut être le maximum de la pression dans les cylindres .  In addition, the engine parameter can be the maximum of the pressure in the cylinders.
Selon une caractéristique du procédé, l ' étape de correction est mise en œuvre par ledit régulateur.  According to a characteristic of the method, the correction step is implemented by said regulator.
Selon un autre mode de mise en œuvre du procédé, l ' étape de correction de l ' avance à l' inj ection alimente une unité de commande avec un signal représentatif d'une correction bornée de l ' avance à l' inj ection. According to another mode of implementation of the method, the step of correcting the injection advance feeds a control unit. with a signal representative of a bounded correction of the advance to injection.
En particulier, le procédé peut comprendre une étape de correction de débit de carburant inj ecté dans les cylindres du moteur.  In particular, the method may comprise a fuel flow correction step injected in the cylinders of the engine.
Selon un autre mode de mise en œuvre du procédé, l ' étape de correction de débit inj ecté génère un signal représentatif d 'un correctif de débit inj ecté pour générer un supplément de couple moteur.  According to another mode of implementation of the method, the injected rate correction step generates a signal representative of a flow rate correction injected to generate additional engine torque.
Selon un autre mode de mise en œuvre du procédé, l ' étape de correction de débit inj ecté est réalisée de manière à conserver une température d' échappement constante, ou sensiblement constante.  According to another embodiment of the method, the injected flow rate correction step is performed so as to maintain a constant, or substantially constant, exhaust temperature.
L 'invention porte également sur un dispositif pour la mise en œuvre d 'un procédé de maximisation d'un couple fourni par un moteur soumis à des contraintes de fiabilité et des dispersions cycliques, comprenant un régulateur adapté pour générer un signal représentatif d'une correction d' avance à l' inj ection à partir d 'un signal représentatif des mesures d'un paramètre du moteur et d'un signal représentatif d'une consigne du paramètre du moteur.  The invention also relates to a device for implementing a method of maximizing a torque provided by an engine subject to reliability constraints and cyclic dispersions, comprising a regulator adapted to generate a signal representative of a correction in advance of the inj ection from a signal representative of the measurements of a motor parameter and of a signal representative of a setpoint of the motor parameter.
Le dispositif comprend une unité de commande configurée pour commander l 'inj ection dans les cylindres du moteur en fonction d 'un signal représentatif d'une correction bornée de l ' avance à l' inj ection et/ou d'un signal représentatif d'une correction de débit de carburant inj ecté dans les cylindres .  The device comprises a control unit configured to control the inj ection in the cylinders of the motor as a function of a signal representative of a bounded correction of the injection advance and / or a signal representative of a fuel flow correction injected in the cylinders.
D ' autres buts, avantages et caractéristiques de l' invention apparaîtront à la lecture de la description détaillée d'un mode de réalisation de l 'invention, non limitatif, illustré sur la figure annexée, qui représente schématiquement les principales étapes d'un procédé de maximisation d'un couple fourni par un moteur, et les éléments structurels du dispositif associé.  Other objects, advantages and characteristics of the invention will appear on reading the detailed description of an embodiment of the invention, not limiting, illustrated in the attached figure, which shows schematically the main steps of a method maximizing a torque provided by a motor, and the structural elements of the associated device.
Sur la figure associée, on a représenté les principales étapes du procédé de maximisation d'un couple fourni par un moteur ainsi que les éléments d'un dispositif selon l' invention destiné à maximiser le couple. Sur cette figure, les étapes de procédé sont illustrées par un lo sange, tandis que les éléments structurels du dispositif sont représentés par des rectangles . Le dispositif de minimisation de couple est destiné à minimiser la pression dans les cylindres d'un moteur à combustion interne de véhicule automobile soumis à des contraintes de fiabilité et des dispersions cycliques. In the associated figure, there is shown the main steps of the method of maximizing a torque provided by a motor and the elements of a device according to the invention for maximizing the torque. In this figure, the process steps are illustrated by a lo sange, while the structural elements of the device are represented by rectangles. The torque minimizing device is intended to minimize the pressure in the cylinders of a motor vehicle internal combustion engine subjected to reliability constraints and cyclic dispersions.
Ce dispositif comprend un comparateur 1 , un régulateur 2 recevant un signal d' erreur erreur _Pcyimax représentatif d' erreur de pression maximale dans les cylindres. Il comprend un capteur de pression 7 adapté pour mesurer la pression dans les cylindres du moteur, ainsi qu'une unité de commande 6 qui commande l' inj ection d'un mélange air/carburant dans les cylindres du moteur à partir d'un signal de correction d' avance à l ' inj ection issu du régulateur 2. This device comprises a comparator 1, a regulator 2 receiving an error signal error _P cy imax representative of maximum pressure error in the cylinders. It comprises a pressure sensor 7 adapted to measure the pressure in the engine cylinders, as well as a control unit 6 which controls the injection of an air / fuel mixture into the engine cylinders from a signal Injection timing correction from regulator 2.
Le procédé comprend une première étape A de définition d 'une plage de fonctionnement du régulateur 2, et une étape B de définition d'un critère de stabilité d'une mesure d'un maximum de la pression dans les cylindres . Le régulateur 2 est capable de mettre en œuvre une de régulation de l ' avance à l ' inj ection.  The method comprises a first step A of defining an operating range of the regulator 2, and a step B of defining a stability criterion of a measurement of a maximum of the pressure in the cylinders. The regulator 2 is capable of implementing a control of the advance to injection.
Le procédé comprend une étape C de bornage de la correction d' avance à l' inj ection, une étape D de calcul de la correction de débit de carburant inj ecté, une étape E de calcul d 'un gradient de maximum de pression dans les cylindres et une étape F de filtrage.  The method comprises a step C of the alignment of the injection advance correction, a step D of calculating the injected fuel flow correction, a step E of calculating a maximum pressure gradient in the ports. cylinders and a filtering step F.
Comme indiqué précédemment, le comparateur 1 , qui peut être intégré dans le régulateur 2, compare deux entrées adaptées pour recevoir un signal de consigne consigne _P cyimax représentatif d 'une consigne d 'un maximum de pression dans les cylindres au voisinage du point mort haut (PMH) du piston et un signal Pcyimax_filtree représentatif des mesures filtrées d'un maximum de pression dans les cylindres. Le comparateur 1 génère à partir de ces deux entrées un signal d' erreur err _P cyimax représentatif d'une erreur d 'un maximum de pression dans les cylindres . As indicated above, the comparator 1, which can be integrated in the regulator 2, compares two inputs adapted to receive a reference setpoint signal _P cy imax representative of a setpoint of a maximum pressure in the cylinders in the vicinity of the neutral position high (TDC) of the piston P and a cy signal representative imax_filtree filtered measures a maximum pressure in the cylinders. The comparator 1 generates from these two inputs an error signal err _P cy imax representative of an error of a maximum pressure in the cylinders.
Par exemple, le comparateur 1 peut calculer cette valeur au moyen de la formule suivante :  For example, the comparator 1 can calculate this value by means of the following formula:
err_Pcyimax=consigne_Pcyimax-Pcyimax Jiltree err_P cy imax = reference_P cy imax-Pc y imax Jiltree
Le signal d' erreur err_Pcyimax représentatif de l ' erreur du maximum de pression dans les cylindres est envoyé au régulateur 2. Ce dernier est prévu pour recevoir un second signal de stabilité stab_PCyimax représentatif d'un état de stabilité des mesures d 'un maximum de pression dans les cylindres . The error signal err_P cy imax representative of the error of the maximum pressure in the cylinders is sent to the regulator 2. The latter is intended to receive a second stability signal stab_P C yimax representative of a state of stability of the measurements of a maximum pressure in the cylinders.
Ce signal doit avoir passé un critère de stabilité. Le procédé met ainsi en œuvre une étape B au cours de laquelle on définit un critère de stabilité à satisfaire pour que le signal d' erreur puisse parvenir au régulateur. Dans un autre mode de mise en œuvre, le critère de stabilité est vérifié par le régulateur 2 et est une condition supplémentaire à l' activation de ce dernier.  This signal must have passed a stability criterion. The method thus implements a step B during which a stability criterion to be satisfied is defined so that the error signal can reach the regulator. In another implementation mode, the stability criterion is verified by the regulator 2 and is an additional condition to the activation of the latter.
Le régulateur 2 comprend une plage de fonctionnement spécifique mettant en j eu une valeur TQI représentative de la demande de couple moteur et une valeur N représentative du régime du moteur. Cette plage de fonctionnement est définie à l ' occasion de l ' étape A.  The regulator 2 comprises a specific operating range setting a TQI value representative of the engine torque demand and an N value representative of the engine speed. This operating range is defined in step A.
En effet, une condition d' activation nécessite, par exemple, que la valeur TQI représentative de la demande de couple moteur soit sensiblement proche d'un seuil Cmax représentatif d' un couple moteur adapté au fonctionnement du régulateur.  Indeed, an activation condition requires, for example, that the TQI value representative of the engine torque demand is substantially close to a threshold Cmax representative of a motor torque adapted to the operation of the regulator.
Cette condition est vérifiée lorsque, après interrogation du régulateur 2, un signal de réponse lui est transmis pour autoriser ou non l ' activation.  This condition is verified when, after interrogation of the regulator 2, a response signal is transmitted to it to allow or not the activation.
Le régulateur 2 est, par exemple, un régulateur de type proportionnel intégral, notamment avec un faible terme proportionnel, permettant d' effectuer un asservissement en boucle fermée de la consigne d'un maximum de pression dans les cylindres. Il est calibré pour ne pas avoir de dépassement de la consigne.  The regulator 2 is, for example, an integral proportional type regulator, in particular with a low proportional term, which makes it possible to carry out a closed-loop servocontrol of the setpoint of a maximum pressure in the cylinders. It is calibrated so as not to exceed the setpoint.
Le régulateur 2 génère en sortie un signal de correction corr_avance représentatif d 'une correction d' avance à l ' inj ection.  The regulator 2 outputs a correction signal corr_avance representative of a correction advance injection.
La correction d' avance à l 'inj ection est bornée durant l ' étape C de bornage de la correction d' avance à l' inj ection pour assurer une dynamique suffisamment lente de la correction d' avance à l ' inj ection.  The injection timing correction is bounded during step C of the timing of the injection timing correction to ensure a sufficiently slow dynamic of the injection timing correction.
C ' est cette correction d' avance à l' inj ection qui, après être parvenue à une unité de commande 6, entraîne une modification de l ' avance à l' inj ection du moteur et engendre, entre autres dispersions cycliques du moteur, des variations du maximum de pression dans les cylindres . It is this correction of the injection advance which, after having reached a control unit 6, causes a modification of the advance to the injection of the motor and causes, among other dispersions motor cyclic, variations in the maximum pressure in the cylinders.
Parallèlement, à débit de carburant inj ecté constant, la modification de l ' avance à l 'inj ection influe sur la température d' échappement Ta vt. En effet, plus l ' avance à l' inj ection augmente, plus la température d' échappement diminue. At the same time, at a constant injected fuel flow rate, the modification of the injection advance has an effect on the exhaust temperature T av t. In fact, the higher the injection advance, the lower the exhaust temperature.
L 'invention propose avantageusement, dans une étape D, de calculer pour chaque variation de l ' avance à l' inj ection un correctif de débit de carburant inj ecté en conservant une température d' échappement Ta vt sensiblement constante au cours des cycles dans le but de gagner un supplément de couple moteur. The invention provides advantageously, in a step D, to calculate for each variation of the advance to the inj ection fuel flow patch inj ected maintaining exhaust temperature T av t substantially constant during the cycles in the goal of gaining extra engine torque.
Ce calcul peut être réalisé par une unité de calcul non représentée sur la figure annexée, qui peut être intégrée dans l'unité de commande 6, et qui génère un signal de correction corr_debit représentatif de la correction de débit inj ecté.  This calculation can be performed by a calculation unit not shown in the appended figure, which can be integrated in the control unit 6, and which generates a correction signal corr_debit representative of the injected flow correction.
Comme indiqué précédemment, le capteur de pression cylindrique 7 mesure la pression dans les cylindres à chaque cycle.  As indicated above, the cylindrical pressure sensor 7 measures the pressure in the cylinders at each cycle.
Ces mesures sont filtrées au cours d'une étape F de filtrage, et sont envoyées au comparateur 1 de manière à réaliser un cycle qui se répète de manière itérative tant que le moteur est en marche.  These measurements are filtered during a filtering step F, and are sent to the comparator 1 so as to carry out a cycle that repeats iteratively as long as the motor is running.
Le filtrage introduit cependant un retard qui peut potentiellement et temporairement entraîner un dépassement de consigne par le régulateur 2.  Filtering, however, introduces a delay that can potentially and temporarily cause a setpoint overflow by the regulator 2.
La plage de fonctionnement du régulateur permet avantageusement de pallier l ' inconvénient du retard de filtrage .  The operating range of the regulator advantageously makes it possible to overcome the disadvantage of the filtering delay.
Par ailleurs, on calcule le gradient grad_Pcyimax de la valeur de pression maximale Pcyimax durant l ' étape E pour définir un critère de stabilité des mesures, et ainsi permettre avantageusement de garantir la faible dynamique du système. Moreover, the grad_P cy imax gradient of the maximum pressure value Pcyimax during step E is calculated to define a criterion of stability of the measurements, and thus advantageously to guarantee the low dynamics of the system.
Un signal de stabilité stab_Pcyimax est généré et est transmis au régulateur 2 de manière à réaliser un cycle qui se répète de manière itérative tant que le moteur est en marche. A stability signal stab_P cy imax is generated and is transmitted to the regulator 2 so as to carry out a cycle which repeats iteratively as long as the engine is running.
Dans un mode de mise en œuvre du procédé, le régulateur est un régulateur classique PID (proportionnel intégral dérivateur), mais présente alors l ' inconvénient de générer des dépassements de consigne. In one mode of implementation of the method, the regulator is a conventional regulator PID (proportional integral derivator), but then has the disadvantage of generating setpoint overruns.
Dans un autre mode de mise en œuvre du procédé, le critère de fonctionnement du régulateur comprend une condition sur un gradient de couple moteur et de régime moteur.  In another mode of implementation of the method, the criterion of operation of the regulator comprises a condition on a gradient of engine torque and engine speed.

Claims

REVENDICATIONS
1 . Procédé de maximisation d'un couple fourni par un moteur soumis à des contraintes de fiabilité et des dispersions cycliques comprenant un régulateur (2) adapté pour générer un signal (corr _avance) représentatif d'une correction d' avance à l 'inj ection à partir d'un signal (Pcyimax) représentatif des mesures d'un paramètre du moteur et d'un signal (consigne _Pcyimax) représentatif d'une consigne du paramètre du moteur, caractérisé en ce qu ' il comprend les étapes de : 1. A method of maximizing a torque provided by an engine subject to reliability constraints and cyclic dispersions comprising a regulator (2) adapted to generate a signal (corr_avance) representative of an advance correction to the injection at from a signal (P cy imax) representative of the measurements of a motor parameter and of a signal (reference _P cy imax) representative of a setpoint of the engine parameter, characterized in that it comprises the steps of :
- définition d 'une consigne de maximum de la pression dans les cylindres (consigne _P yimax) ; - Definition of a setpoint of maximum pressure in the cylinders (setpoint _P y imax);
- définition d'une plage de fonctionnement dudit régulateur ; defining an operating range of said regulator;
- définition d'un critère de stabilité d'une mesure d 'un maximum de la pression dans les cylindres (Pcyim ax) ; - definition of a criterion of stability of a measurement of a maximum of the pressure in the cylinders (P cy im ax);
régulation de l ' avance à l ' inj ection ; et  regulation of advance to injection; and
- correction de l ' avance à l ' inj ection.  - correction of the advance to the inj ection.
2. Procédé selon la revendication 1 , dans lequel l ' étape de définition d 'une consigne du maximum de la pression dans les cylindres comprend la génération d 'un signal (consigne _Pcyimax) représentatif d'une consigne du maximum de la pression dans les cylindres . 2. The method of claim 1, wherein the step of defining a set of the maximum cylinder pressure includes generating a signal (imax _P setpoint cy) representative of a desired maximum pressure in the cylinders.
3. Procédé selon l 'une quelconque des revendications précédentes, dans lequel l' étape de définition d 'une plage de fonctionnement du régulateur comprend une comparaison des valeurs (N,TQI) représentatives du régime moteur et de la demande de couple moteur à un seuil ( Cm ax) de couple moteur adapté au fonctionnement du régulateur.  3. Method according to any one of the preceding claims, wherein the step of defining a range of operation of the regulator comprises a comparison of the values (N, TQI) representative of the engine speed and the engine torque demand to a threshold (Cm ax) of motor torque adapted to the operation of the regulator.
4. Procédé selon l 'une quelconque des revendications précédentes, dans lequel l' étape de définition d 'une plage de fonctionnement du régulateur comprend une condition de stabilisation d'une valeur (Pcyimax) représentative du maximum de la pression dans les cylindres. 4. Method according to any one of the preceding claims, in which the step of defining an operating range of the regulator comprises a stabilization condition of a value (P cy imax) representative of the maximum of the pressure in the cylinders. .
5. Procédé selon l 'une quelconque des revendications précédentes, dans lequel l ' étape de régulation est mise en œuvre au moyen d'un régulateur (2) de type proportionnel intégral, ledit régulateur étant calibré pour que le signal généré (corr _avance) représentatif d'une correction d'avance à l'injection ne dépasse pas une valeur de consigne du paramètre du moteur. The method according to any one of the preceding claims, wherein the regulating step is implemented at by means of a regulator (2) of integral proportional type, said regulator being calibrated so that the generated signal (corr_avance) representative of an injection advance correction does not exceed a set value of the engine parameter.
6. Procédé selon l'une quelconque des revendications précédentes, dans lequel ledit paramètre du moteur est le maximum de la pression dans les cylindres.  The method of any one of the preceding claims, wherein said engine parameter is the maximum of the pressure in the cylinders.
7. Procédé selon l'une quelconque des revendications précédentes, dans lequel l'étape de correction de l'avance à l'injection est mise en œuvre par ledit régulateur (2).  7. Method according to any one of the preceding claims, wherein the step of correction of the injection advance is implemented by said regulator (2).
8. Procédé selon l'une quelconque des revendications précédentes, dans lequel l'étape de correction de l'avance à l'injection alimente une unité de commande (6) avec un signal {corr_injection_bornee) représentatif d'une correction bornée de l'avance à l'injection.  8. A method according to any one of the preceding claims, wherein the step of correction of the injection advance feeds a control unit (6) with a signal {corr_injection_bornee) representative of a bounded correction of the advance to injection.
9. Procédé selon l'une quelconque des revendications précédentes, comprenant une étape de correction de débit de carburant injecté dans les cylindres du moteur.  9. A method according to any one of the preceding claims, comprising a fuel flow rate correction step injected into the engine cylinders.
10. Procédé selon la revendication 9, dans lequel ladite étape de correction de débit injecté génère un signal (corr_debit) représentatif d'un correctif de débit injecté pour générer un supplément de couple moteur.  The method according to claim 9, wherein said injected rate correction step generates a signal (corr_debit) representative of an injected rate correction to generate additional engine torque.
11. Procédé selon la revendication 10, dans lequel l'étape de correction de débit injecté est réalisée de manière à conserver une température d'échappement (Tavt) constante, ou sensiblement constante. 11. The method of claim 10, wherein the injected flow rate correction step is performed so as to maintain a constant exhaust temperature (T av t), or substantially constant.
12. Dispositif pour la mise en œuvre d'un procédé de maximisation d'un couple fourni par un moteur soumis à des contraintes de fiabilité et des dispersions cycliques comprenant un régulateur (2) adapté pour générer un signal représentatif d'une correction d'avance à l'injection à partir d'un signal représentatif des mesures d'un paramètre du moteur (Pcyimax) et d'un signal représentatif d'une consigne du paramètre du moteur (consigne _Pcyimax), caractérisé en ce qu'il comprend une unité de commande (6) configurée pour commander l'injection dans les cylindres du moteur en fonction d'un signal {corr _avance_bornee) représentatif d'une correction bornée de l'avance à l'injection et/ou d'un signal (corr_debit) représentatif d'une correction de débit de carburant injecté dans les cylindres. Apparatus for implementing a method of maximizing a torque provided by an engine subject to reliability constraints and cyclic dispersions comprising a regulator (2) adapted to generate a signal representative of a correction of injection advance from a signal representative of the measurements of a motor parameter (P cy imax) and a signal representative of a reference of the motor parameter (reference _P cy imax), characterized in that it comprises a control unit (6) configured to controlling the injection into the cylinders of the engine as a function of a signal {corr_avance_bornee) representative of a bounded correction of the injection advance and / or of a signal (corr_debit) representative of a correction of flow fuel injected into the cylinders.
PCT/FR2017/052647 2016-10-07 2017-09-28 Method for maximizing an engine torque WO2018065700A2 (en)

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