EP0646710A1 - Vorrichtung zum Verändern des Drehmoments während besonderer Betriebszustände einer Brennkraftmaschine - Google Patents

Vorrichtung zum Verändern des Drehmoments während besonderer Betriebszustände einer Brennkraftmaschine Download PDF

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Publication number
EP0646710A1
EP0646710A1 EP94115402A EP94115402A EP0646710A1 EP 0646710 A1 EP0646710 A1 EP 0646710A1 EP 94115402 A EP94115402 A EP 94115402A EP 94115402 A EP94115402 A EP 94115402A EP 0646710 A1 EP0646710 A1 EP 0646710A1
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EP
European Patent Office
Prior art keywords
engine
value
block
state
mixture
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP94115402A
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English (en)
French (fr)
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EP0646710B1 (de
Inventor
Stefano Scolari
Giancarlo Ricciardelli
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Marelli Europe SpA
Original Assignee
Weber SRL
Magneti Marelli SpA
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Application filed by Weber SRL, Magneti Marelli SpA filed Critical Weber SRL
Publication of EP0646710A1 publication Critical patent/EP0646710A1/de
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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 for varying the engine torque in particular operating states of an endothermic engine 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.
  • 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 of a vehicle comprising: a plurality of sensors capable of detecting parameters of the engine such as the number of engine revolutions, the engine stroke, the angular position of the throttle of the air intake manifold, the temperature of the cooling fluid of the engine, the temperature of the air taken in, the electric voltage of the battery of the vehicle, and others; an electronic injection device; a memory block in which there are stored, for each engine speed, the management maps of said injection device; a block for control of said injection device in the state of normal distribution of air/fuel mixture; a block for processing and comparing data, capable of processing the parameters of the engine and of managing said control block; first means, activated in the air/fuel mixture cut-off state, for comparing, for each engine stroke, the detected value of the angular position of the throttle of the air intake manifold with a first threshold value; second means, activated in the mixture cut-off state, for comparing,
  • 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: a central electronic unit 2; a plurality of sensors 3 connected to the central unit 2 and capable of detecting the parameters of the engine such as the number of engine revolutions, the engine stroke, the angular position of the throttle (not illustrated) of the air intake manifold (not illustrated), the temperature of the cooling fluid of the engine, the temperature of the air taken in, the electric voltage of the battery (not illustrated) of the vehicle and others; an electronic injection device 4 controlled by the central unit 2; an electronic ignition device 5 controlled by the central unit 2; a device 6 for control of a fuel pump (not illustrated), this device being managed by the central unit 2; a device 7 for management of the flow of air taken in by the intake manifold, and a device 8 mounted on the dashboard (not illustrated) of the vehicle and capable of signalling the cut-off state, and the states of entering and leaving the cut-off state.
  • the parameters of the engine such as the number of engine revolutions, the engine stroke, the angular position of the throttle (not illustrated) of the air intake manifold (
  • the central unit 2 comprises: a block 9 for reading of the input quantities signalled by the sensors 3; a memory block 11, in which the management maps of the devices 4, 5, 6 and 7 for each speed of the engine are stored; a memory block 12, in which threshold values and values of coefficients which will be described below are stored; a block 13 for control of the devices 4, 5, 6 and 7 in the state of normal mixture distribution; a block 14 for control of the devices 4, 5, 6, 7 and 8 in passing from a state of normal distribution to that of mixture cut-off and vice versa; a block 15 for processing and comparing data and for management of the blocks 13 and 14, and a counter 16 connected to the block 15.
  • 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 which are possible both as values of the coefficients Ki and Ko and as the number of boxes. 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)
EP94115402A 1993-09-30 1994-09-29 Vorrichtung zum Verändern des Drehmoments während besonderer Betriebszustände einer Brennkraftmaschine Expired - Lifetime EP0646710B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITBO930388 1993-09-30
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.

Publications (2)

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

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Application Number Title Priority Date Filing Date
EP94115402A Expired - Lifetime EP0646710B1 (de) 1993-09-30 1994-09-29 Vorrichtung zum Verändern des Drehmoments während besonderer Betriebszustände einer Brennkraftmaschine

Country Status (5)

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EP (1) EP0646710B1 (de)
BR (1) BR9403624A (de)
DE (1) DE69415256T2 (de)
ES (1) ES2127325T3 (de)
IT (1) IT1264226B1 (de)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2406080A1 (fr) * 1977-10-11 1979-05-11 Nissan Motor Systeme d'injection de carburant pour un moteur a combustion interne de vehicule automobile, equipe d'un generateur de signal de commande de coupure de carburant
US4259723A (en) * 1978-05-04 1981-03-31 Nippondenso Co., Ltd. Method for controlling operations of a combustion engine
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
GB2138176A (en) * 1983-04-06 1984-10-17 Honda Motor Co Ltd Method for controlling fuel supply to an internal combustion engine after termination of fuel cut
EP0501541A1 (de) * 1991-02-28 1992-09-02 General Motors Corporation Verfahren und Vorrichtung zur Steuerung der Kraftstoffeinspritzung

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2406080A1 (fr) * 1977-10-11 1979-05-11 Nissan Motor Systeme d'injection de carburant pour un moteur a combustion interne de vehicule automobile, equipe d'un generateur de signal de commande de coupure de carburant
US4259723A (en) * 1978-05-04 1981-03-31 Nippondenso Co., Ltd. Method for controlling operations of a combustion engine
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
GB2138176A (en) * 1983-04-06 1984-10-17 Honda Motor Co Ltd Method for controlling fuel supply to an internal combustion engine after termination of fuel cut
EP0501541A1 (de) * 1991-02-28 1992-09-02 General Motors Corporation Verfahren und Vorrichtung zur Steuerung der Kraftstoffeinspritzung

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 8, no. 124 (M - 301)<1561> 9 June 1984 (1984-06-09) *

Also Published As

Publication number Publication date
DE69415256T2 (de) 1999-07-01
IT1264226B1 (it) 1996-09-23
BR9403624A (pt) 1995-05-30
DE69415256D1 (de) 1999-01-28
ITBO930388A1 (it) 1995-03-30
ITBO930388A0 (it) 1993-09-30
ES2127325T3 (es) 1999-04-16
EP0646710B1 (de) 1998-12-16

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