EP0646710B1 - Dispositif pour modifier le couple moteur dans des états de fonctionnement particuliers d'un moteur à combustion interne - Google Patents

Dispositif pour modifier le couple moteur dans des états de fonctionnement particuliers d'un moteur à combustion interne Download PDF

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Publication number
EP0646710B1
EP0646710B1 EP94115402A EP94115402A EP0646710B1 EP 0646710 B1 EP0646710 B1 EP 0646710B1 EP 94115402 A EP94115402 A EP 94115402A EP 94115402 A EP94115402 A EP 94115402A EP 0646710 B1 EP0646710 B1 EP 0646710B1
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EP
European Patent Office
Prior art keywords
engine
block
state
value
mixture
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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.)
Expired - Lifetime
Application number
EP94115402A
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German (de)
English (en)
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EP0646710A1 (fr
Inventor
Stefano Scolari
Giancarlo Ricciardelli
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Marelli Europe SpA
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Magneti Marelli SpA
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Publication of EP0646710A1 publication Critical patent/EP0646710A1/fr
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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
    • F02D41/02—Circuit arrangements for generating control signals
    • F02D41/04—Introducing corrections for particular operating conditions
    • F02D41/12—Introducing corrections for particular operating conditions for deceleration
    • F02D41/123—Introducing corrections for particular operating conditions for deceleration the fuel injection being cut-off
    • 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
    • F02D41/04—Introducing corrections for particular operating conditions
    • F02D41/12—Introducing corrections for particular operating conditions for deceleration
    • F02D41/123—Introducing corrections for particular operating conditions for deceleration the fuel injection being cut-off
    • F02D41/126—Introducing corrections for particular operating conditions for deceleration the fuel injection being cut-off transitional corrections at the end of the cut-off period

Definitions

  • the present invention relates to an apparatus controlling the engine torque of a vehicle.
  • the apparatus forming the subject of the present invention relates to a strategy of control of the fuel inflow towards the cylinders of the engine in order to pass from a state of normal distribution of the fuel to a fuel cut-off state and vice versa.
  • Present-day apparatuses which allow passing from the state of normal distribution of the fuel to that of fuel cut-off and vice versa provide, in equal measure for all the cylinders of the engine and after a predetermined time or after a predetermined number of engine strokes, for the cut-off (the increase) of 100% of the fuel in one or two stages.
  • GB-A-2138176 discloses an apparatus for progressively modifying, during recovery from a cut-off condition, the fuel supply by the use of different tables, taking into account the speed of variation of the number of engine revolutions.
  • the apparatuses described above comprise a number of disadvantages which manifest themselves in particular in an unpleasantness in driving the vehicle due to abrupt switching from the positive torque state to the negative torque state and vice versa, which abrupt switching causes jumps and kicks of the engine. It is clear that the shaking of the engine does nothing but increase the wear of the various parts of the engine. Moreover, in passing from the fuel cut-off state to the state of normal distribution, the quantity of fuel to be supplied is defined in a single solution, irrespective of the reason (intake throttle angle variation or variation of number of engine revolutions) which is causing the return to the state of normal distribution. It can therefore happen that, on a request for increased power of the engine, the response of the engine falls short of expectations.
  • the aim of the present invention is that of producing an apparatus for varying the engine torque in particular operating states of an endothermic engine of a vehicle which is free of the disadvantages mentioned, that is to say which reduces the engine shaking in passing from a state of normal distribution of the fuel to a fuel cut-off state and vice versa.
  • an apparatus for varying the engine torque in particular operating states of an endothermic engine (not illustrated) of a vehicle (not illustrated) is indicated as a whole by 1.
  • the apparatus 1 brings about the control of the inflow of the air/fuel mixture towards the cylinders (not illustrated) of the engine in order to pass from a state of normal distribution of the air/fuel mixture to an air/fuel mixture cut-off state and vice versa.
  • the apparatus 1 comprises:
  • the central unit 2 comprises:
  • the block 15 calculates the engine speed, takes from the block 11 for the calculated speed the management maps of the devices 4, 5, 6 and 7 and, according to the data of said maps, manages the block 13 which then controls the devices 4, 5, 6 and 7.
  • an operating cycle of the apparatus 1 is now described, which makes it possible to pass from a state of normal distribution of the air/fuel mixture represented by a block 21 to a mixture cut-off state represented by a block 22.
  • the apparatus passes from the block 21 to a block 23, in which in the block 15 the detected value F of the angular position of the throttle of the air intake manifold is compared with a threshold value MF1 stored in the block 12.
  • the apparatus passes from the block 23 to a block 24 while, in the opposite case, it returns from the block 23 to the block 21.
  • the detected value RPM of the nubmer of engine revolutions is compared with a threshold value MRPM1 stored in the block 12. In the event that the value RPM is greater than or equal to the value MRPM1, the apparatus passes from the block 24 to a block 25 while, in the opposite case, it returns from the block 24 to the block 21.
  • a strategy of control of the devices 4, 5, 6, 7 and 8 is carried out by means of the block 14 for the purpose of passing in a predetermined number of engine strokes N to the cut-off state (which state as will be recalled does not allow any inflow of air/fuel mixture to the engine) and for the purpose of signalling to the user, by means of the device 8, the switch-over to the cut-off state.
  • the apparatus passes from the block 25 to a block 26, in which in the block 15 the value F is compared with the threshold value MF1.
  • the apparatus passes from the block 26 to a block 27 while, in the opposite case, it returns from the block 26 to the block 21.
  • the value RPM is compared with the threshold value MRPM1. In the event that the value RPM is greater than or equal to the value MRPM1, the apparatus passes from the block 27 to the block 22 while, in the opposite case, it returns from the block 27 to the block 21.
  • FIG 4 a preferred embodiment of the strategy carried out by the block 25 is illustrated.
  • a table 28 Figure 5 of coefficients Ki which is stored in the block 12.
  • the table 28 comprises N boxes, with each of which a value of the coefficient Ki is associated.
  • the apparatus moves to a block 34 in which the injection time Tj just calculated is multiplied by the coefficient Ki1 so as to define a new injection time Tji1.
  • an injection of mixture according to the new injection time Tji1 is moreover ordered for the cylinder in its intake stroke.
  • the apparatus moves to a block 35 in which it is decided whether the quantity C is greater than the number N of the boxes of the table 28.
  • the apparatus moves from the block 35 to a block 37 and from this to the block 26 of Figure 2 while, in the opposite case, it passes from the block 35 to a block 36, in which the value of the quantity C of the counter 16 is increased by one unit. From the block 36 it then returns the block 32.
  • the device 8 is activated, which signals, for example by means of a warning light (not illustrated), the switch-over to the mixture cut-off state.
  • the block 25 makes it possible to calculate cylinder by cylinder an injection time Tji1 following the variation of the engine speed.
  • the values of the coefficients Ki are worked out so as to vary the engine torque, in passing from the state of normal air/fuel mixture distribution to that of cut-off, according to the rate which does not comprise abrupt switching over and therefore shaking of the engine.
  • the detected value F of the angular position of the throttle of the air intake manifold is compared with a minimum threshold value MF2 stored in the block 12. In the event that the value F is smaller than or equal to the value MF2, the apparatus passes from the block 43 to a block 44 while, in the opposite case, it passes from the block 43 to a block 45.
  • the detected value RPM of the number of engine revolutions is compared with a threshold value MRPM2 stored in the block 12. In the event that the value RPM is greater than or equal to the value MRPM2, the apparatus returns from the block 44 to the block 22 while, in the opposite case, it passes from the block 44 to a block 46.
  • the apparatus passes from the block 45 to a block 47 while, in the opposite case, it passes from the block 45 to a block 48.
  • the variation of the number of engine revolutions in a predetermined time ⁇ RPM/ ⁇ t is compared with a threshold value MRPMt stored in the block 12. In the event that the value ⁇ RPM/ ⁇ t is greater than or equal to the value MRPMt, the apparatus passes from the block 46 to a block 51 while, in the opposite case, it passes from the block 46 to a block 52.
  • the parameter used in the block 41 detects any rapid and undesirable decreases in the engine speed.
  • the angular position of the throttle of the air intake manifold and therefore the angular position of the accelerator pedal is evaluated, which position represents the intention of the user to leave the cut-off state.
  • the speed of the variation of the angular positon of the throttle and in substance the pressure exerted by the user on the accelerator pedal is evaluated.
  • the apparatus 1 provides for leaving the cut-off state when there is a variation of the flow of the air taken in (block 41), a variation of the angular position of the throttle (block 43) and a variation of the number of engine revolutions (block 44).
  • the apparatus 1 also detects the manner of variation of the angular position of the throttle (block 45) and of variation of the number of engine revolutions (block 46).
  • the apparatus 1 provides for five possibilities (blocks 42, 47, 48, 51 and 52) for leaving the cut-off state.
  • five tables similar to the table 28 are stored, each of which relates to a state of leaving the cut-off state.
  • the relevant table is therefore taken from the block 12.
  • the apparatus passes to a block 53, which is similar to the block 25 of Figures 2 and 4, and from the block 53 to the block 21, which represents the state of normal distribution of the air/fuel mixture.
  • the operating diagram of the block 25 illustrated in Figure 4 can also be assumed as the operating diagram of the block 53.
  • a strategy of control of the devices 4, 5, 6, 7 and 8 is carried out by means of the block 14 for the purpose of passing in a predetermined number of engine strokes N from the mixture cut-off state to the state of normal distribution and for the purpose of signalling to the user, by means of the device 8, the switch-over to said state of normal distribution of the mixture.
  • the components of the block 53 are numbered at the side of the numbering of the components of the block 25 and in brackets.
  • a table (corresponding to the block 52, 47, 48, 51 or 52 through which the block 53 has been reached) of coefficients Ko stored in the block 12.
  • the table comprises N boxes, with each of which a value of the coefficient Ko is associated.
  • the block 53 comprises a block 54, in which in the counter 16 a quantity D is given the value 1, the quantity D being related to the sequence of the boxes of the above-mentioned table. From the block 54 the apparatus passes to a block 55, in which the speed of the engine is evaluated and the injection time Tj for this speed is calculated.
  • the apparatus passes from the block 58 to a block 62 and from this to the block 21 of Figure 3 while, in the opposite case, it passes from the block 58 to a block 61 in which the value of the quantity D of the counter 16 is increased by one unit. From the block 61 the apparatus then returns to the block 55. In the block 62, the device 8 is activated, which signals, for example by means of a warning light (not illustrated), the switch-over to the state of normal distribution of the mixture.
  • a warning light not illustrated
  • the block 53 makes it possible therefore, as a function of the type of state of leaving the cut-off state, to calculate cylinder by cylinder an injection time Tjo1 following the variation of the engine speed.
  • the values of the coefficients Ko are worked out so as to vary the engine torque, in passing from the cut-off state to that of normal distribution, according to a rate which does not comprise abrupt switching over and therefore shaking of the engine.
  • other parameters such as the variation of the advance of the electronic ignition, the variation of the control of the fuel pump, and/or the variation of the flow of the air taken in, can contribute to the working out of the rate of variation of the engine torque in various embodiments.
  • an apparatus which makes it possible to graduate the variation of the engine torque so as to avoid abrupt shaking of the engine both in entering and in leaving the cut-off state.
  • the manner of control of the inflow of the air/fuel mixture contributes in a particular way to the rate of variation of the engine torque, which manner is worked out for each cylinder and updated for each engine stroke to follow the engine speed.
  • a rate of variation of the engine torque is selected as a function of the variation of the values of a number of parameters and of the speed of variation of said values. In this way, the intentions of the user are followed with greater promptness.
  • the rates of variation of the engine torque both in entering and in leaving the cut-off state and in substance the tables of the coefficients Ki and Ko can be the varied items. It is therefore possible to adapt the rates of variation of the engine torque in entering and in leaving the cut-off state both to the type of engine installed in the vehicle and to the performance which it is desired to obtain from the engine particularly in leaving the cut-off state.

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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)
  • Hybrid Electric Vehicles (AREA)
  • Electric Propulsion And Braking For Vehicles (AREA)

Claims (10)

  1. Dispositif commandant le couple moteur d'un véhicule, comprenant :
    une pluralité de capteurs (3) aptes à détecter des paramètres du moteur tels que la vitesse de rotation du moteur, la course du moteur, la position angulaire du papillon des gaz du collecteur d'admission d'air, la température du fluide de refroidissement du moteur, la température de l'air admis, la tension électrique de la batterie du véhicule, et autres;
    un dispositif d'injection électronique (4);
    un bloc de mémoire (11), dans lequel sont mémorisés, pour chaque vitesse du moteur, les tableaux de gestion dudit dispositif d'injection (4);
    un bloc (13) servant à commander ledit dispositif d'injection (4) dans l'état de distribution normale du mélange air / carburant;
    un bloc (15) pour traiter et comparer des données, apte à traiter les paramètres du moteur et à gérer ledit bloc de commande (13);
    des premiers moyens comparateurs (43) activés par l'état de coupure du mélange, pour comparer, pour chaque course du moteur, la valeur détectée (F) de la position angulaire du papillon des gaz du collecteur d'admission d'air à une première valeur de seuil (MF2);
    des seconds moyens comparateurs (44) activés dans l'état de coupure du mélange, pour comparer pour chaque course du moteur la valeur détectée (RPM) de la vitesse de rotation du moteur à une seconde valeur de seuil (MRPM2);
    des premiers moyens de commande (53), activés lorsque ladite valeur (F) de la position angulaire du papillon des gaz est supérieure à ladite première valeur de seuil (MF2) ou lorsque ladite valeur (RMP) de la vitesse de rotation du moteur est inférieure à ladite seconde valeur de seuil (MRPM2), qui commande, pour chaque cylindre du moteur et en fonction d'un premier tableau prédéterminé, l'entrée du mélange de manière à passer, en un premier intervalle de temps, de l'état de coupure du mélange à l'état de distribution normale avec une vitesse de variation prédéterminée du couple moteur;
    le dispositif étant caractérisé en ce qu'il comporte des moyens de détection de la vitesse (δF/δt et δRPM/Δt) de variation de la valeur détectée (F) de la position angulaire du papillon des gaz du collecteur d'admission d'air et de la valeur détectée (RPM) de la vitesse de rotation du moteur, et comporte également cinq premiers tableaux, le premier étant associé à une variation supérieure à une troisième valeur de seuil donnée (MFt) de ladite valeur (F) de la position angulaire du papillon des gaz, le second étant associé à une variation inférieure à ladite première valeur de seuil (MFt) de ladite valeur (F) de la position angulaire du papillon des gaz, le troisième étant associé à une valeur supérieure à une quatrième valeur de seuil donnée (MRPMt) de ladite valeur (RPM) de la vitesse de rotation du moteur, le quatrième étant associé à une variation supérieure à ladite quatrième valeur de seuil (MRPMt) de ladite valeur (RPM) de la vitesse de rotation du moteur, et le cinquième étant associé à la variation au-dessus d'une cinquième valeur de seuil (MCa) d'une valeur (Qa) correspondant à un paramètre de l'air admis dans ledit collecteur d'admission.
  2. Dispositif selon la revendication 1, caractérisé en ce qu'il comprend des troisièmes moyens comparateurs (41), activés dans un état de coupure du mélange, pour comparer, pour chaque phase du moteur, la valeur détectée (Qa) associée aux paramètres de l'air admis dans ledit collecteur d'admission à ladite cinquième valeur de seuil (MQa) pour sélectionner ledit cinquième premier tableau en tant que premier tableau correct; lesdits premiers moyens de commande (53) étant activés lorsque la valeur (Qa) concernant le paramètre de l'air admis dans ledit collecteur d'admission est supérieure à ladite cinquième valeur de seuil (MQa) .
  3. Dispositif selon la revendication 1 et/ou 2, caractérisé en ce que chacune desdits premiers tableaux comprend, selon une séquence donnée, une pluralité de premiers coefficients (Ko) possédant chacun une valeur prédéterminée; ledit premier coefficient (Ko) étant associé au nombre de courses du moteur réglées pour passer de l'état de coupure du mélange à l'état de distribution normale du carburant; lesdits premiers moyens de commande (53) comprenant un bloc (55) qui, pour chaque course du moteur et sur la base des paramètres du moteur, traite les conditions de fonctionnement du moteur et, à partir de là, l'instant d'injection (Tj) associé au cylindre dans sa course d'admission pendant cette phase du moteur, et un bloc (57) qui calcule un nouvel instant d'injection (Tj01) pour chaque phase du moteur en fonction de l'instant d'injection (Tj) calculé sur la base des conditions du moteur et de l'un desdits premiers coefficients (Ko), et qui commande en outre, pour le cylindre lors de sa course d'admission, une injection de mélange de carburant en fonction du nouvel instant d'injection (Tj0).
  4. Dispositif selon au moins l'une des revendications précédentes, caractérisé en ce qu'il comporte des quatrièmes moyens comparateurs (23) pour comparer, pour chaque course du moteur, la valeur détectée (F) de la position angulaire du papillon des gaz du collecteur d'admission d'air à une sixième valeur de seuil (MF1); des cinquièmes moyens comparateurs (24) pour comparer, pour chaque course du moteur, la valeur détectée (RPM) de la vitesse de rotation du moteur à une septième valeur de seuil (MRPM1); et des seconds moyens de commande (25), activés lorsque ladite valeur (F) de la position angulaire du papillon des gaz est inférieure à ladite sixième valeur de seuil (MF1) et ladite valeur (RPM) de la vitesse de rotation du moteur est supérieure à ladite septième valeur de seuil (MRPM1), qui commande, pour chaque cylindre du moteur et en fonction d'un second tableau prédéterminé (28), l'introduction du mélange de manière à passer, en un intervalle de temps prédéterminé, de l'état de distribution normale du mélange à l'état de coupure du mélange avec une vitesse prédéterminée de variation du couple moteur.
  5. Dispositif selon la revendication 4, caractérisé en ce que ledit second tableau (26) comprend, conformément à une séquence donnée, une pluralité de seconds coefficients (Ki), ayant chacun une valeur prédéterminée; lesdits seconds coefficients (Ki) étant associés au nombre de courses du moteur réglées pour passer de l'état de distribution normale du mélange à l'état de coupure du mélange; lesdits seconds moyens de commande (25) comprenant un bloc (32) qui, pour chaque course du moteur et sur la base des paramètres du moteur, traite les conditions de fonctionnement du moteur et, à partir de là, l'instant d'injection (Tj) associé au cylindre dans la course d'admission pendant la course du moteur, et un bloc (31) qui calcule pour chaque course du moteur un nouvel instant d'injection (Tji1), qui est fonction de l'instant d'injection (Tj) calculé sur la base des conditions de fonctionnement du moteur et de l'un desdits seconds coefficients (Ki) et qui en outre commande, pour le cylindre lors de la course d'admission, une injection du mélange en fonction du nouvel instant d'injection (Tji).
  6. Dispositif selon au moins l'une des revendications précédentes, caractérisé en ce qu'il comporte des moyens modifiant la commande d'une pompe (6) de délivrance du carburant, pendant le passage de l'état de distribution normale du mélange à l'état de coupure du mélange.
  7. Dispositif selon l'une des revendications précédentes, caractérisé en ce qu'il comprend des moyens modifiant la commande d'une pompe (6) de délivrance du carburant, pendant le passage de l'état de coupure du mélange à l'état de distribution normale du carburant.
  8. Dispositif selon au moins l'une des revendications précédentes, caractérisé en ce qu'il comprend des moyens modifiant, pendant le passage de distribution normale du mélange à l'état de coupure du mélange, la commande d'un dispositif d'allumage électronique (5) pour modifier l'avance à l'allumage.
  9. Dispositif selon au moins l'une des revendications précédentes, caractérisé en ce qu'il comprend des moyens modifiant, pendant le passage de l'état de coupure du mélange à l'état de distribution normale du mélange, la commande d'un dispositif d'allumage électronique (5) pour modifier l'avance à l'allumage.
  10. Dispositif selon les revendications précédentes, caractérisé en ce qu'il comprend des moyens (8) pour signaler à l'utilisateur l'état de coupure du mélange.
EP94115402A 1993-09-30 1994-09-29 Dispositif pour modifier le couple moteur dans des états de fonctionnement particuliers d'un moteur à combustion interne Expired - Lifetime EP0646710B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT93BO000388A IT1264226B1 (it) 1993-09-30 1993-09-30 Apparecchiatura per la variazione della coppia motore in particolari condizioni di funzionamento di un motore endotermico di un veicolo.
ITBO930388 1993-09-30

Publications (2)

Publication Number Publication Date
EP0646710A1 EP0646710A1 (fr) 1995-04-05
EP0646710B1 true EP0646710B1 (fr) 1998-12-16

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EP94115402A Expired - Lifetime EP0646710B1 (fr) 1993-09-30 1994-09-29 Dispositif pour modifier le couple moteur dans des états de fonctionnement particuliers d'un moteur à combustion interne

Country Status (5)

Country Link
EP (1) EP0646710B1 (fr)
BR (1) BR9403624A (fr)
DE (1) DE69415256T2 (fr)
ES (1) ES2127325T3 (fr)
IT (1) IT1264226B1 (fr)

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5820374B2 (ja) * 1977-10-11 1983-04-22 日産自動車株式会社 内燃機関用電子制御燃料噴射装置
JPS54145819A (en) * 1978-05-04 1979-11-14 Nippon Denso Co Ltd Engine control
JPS5928029A (ja) * 1982-08-06 1984-02-14 Toyota Motor Corp 内燃機関の電子制御燃料噴射方法
JPS59185833A (ja) * 1983-04-06 1984-10-22 Honda Motor Co Ltd 内燃エンジンの燃料供給制御方法
US5119781A (en) * 1991-02-28 1992-06-09 General Motors Corporation Control of engine fuel injection during transitional periods associated with deceleration fuel cut-off

Also Published As

Publication number Publication date
ITBO930388A0 (it) 1993-09-30
EP0646710A1 (fr) 1995-04-05
DE69415256D1 (de) 1999-01-28
ES2127325T3 (es) 1999-04-16
BR9403624A (pt) 1995-05-30
IT1264226B1 (it) 1996-09-23
ITBO930388A1 (it) 1995-03-30
DE69415256T2 (de) 1999-07-01

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