EP1072778B1 - Méthode de régulation de la vitesse de ralenti pour un moteur à combustion interne - Google Patents

Méthode de régulation de la vitesse de ralenti pour un moteur à combustion interne Download PDF

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Publication number
EP1072778B1
EP1072778B1 EP00830518A EP00830518A EP1072778B1 EP 1072778 B1 EP1072778 B1 EP 1072778B1 EP 00830518 A EP00830518 A EP 00830518A EP 00830518 A EP00830518 A EP 00830518A EP 1072778 B1 EP1072778 B1 EP 1072778B1
Authority
EP
European Patent Office
Prior art keywords
engine
value
torque
internal combustion
cycle
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.)
Expired - Lifetime
Application number
EP00830518A
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German (de)
English (en)
Other versions
EP1072778A2 (fr
EP1072778A3 (fr
Inventor
Cesare Ponti
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.)
Centro Ricerche Fiat SCpA
Original Assignee
Centro Ricerche Fiat SCpA
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Publication of EP1072778A2 publication Critical patent/EP1072778A2/fr
Publication of EP1072778A3 publication Critical patent/EP1072778A3/fr
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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
    • F02D41/02—Circuit arrangements for generating control signals
    • F02D41/14—Introducing closed-loop corrections
    • F02D41/16—Introducing closed-loop corrections for idling
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D31/00—Use of speed-sensing governors to control combustion engines, not otherwise provided for
    • F02D31/001—Electric control of rotation speed
    • F02D31/002—Electric control of rotation speed controlling air supply
    • F02D31/003—Electric control of rotation speed controlling air supply for idle speed control
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D31/00—Use of speed-sensing governors to control combustion engines, not otherwise provided for
    • F02D31/001—Electric control of rotation speed
    • F02D31/007—Electric control of rotation speed controlling fuel supply
    • F02D31/008—Electric control of rotation speed controlling fuel supply for idle speed control
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/02—Circuit arrangements for generating control signals
    • F02D41/14—Introducing closed-loop corrections
    • F02D41/1497—With detection of the mechanical response of the engine
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D2200/00—Input parameters for engine control
    • F02D2200/02—Input parameters for engine control the parameters being related to the engine
    • F02D2200/10—Parameters related to the engine output, e.g. engine torque or engine speed
    • F02D2200/1002—Output torque
    • F02D2200/1004—Estimation of the output torque
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D2200/00—Input parameters for engine control
    • F02D2200/02—Input parameters for engine control the parameters being related to the engine
    • F02D2200/10—Parameters related to the engine output, e.g. engine torque or engine speed
    • F02D2200/1012—Engine speed gradient

Definitions

  • the present invention concerns a method for controlling idling in an internal combustion engine for vehicles.
  • Modern motor vehicles are provided with a variety of accessory devices, such as for example the compressor of the air conditioning system, the alternator and relevant electric loads, which together generate a resisting torque applied to the output shaft of the engine.
  • This resisting torque has a value that varies as a function of the operating condition of each individual accessory device.
  • During idling of the internal combustion engine variation of the resisting torque caused by the accessory devices tends to produce a variation in the number of revolutions of the engine.
  • Modern engines for vehicles are normally provided with an electronic control unit which is capable of correcting the quantity of air and fuel fed to the engine to keep the revolution speed of the engine as constant as possible during idling.
  • the electronic control unit detects the engine revolution speed and corrects the variations according to a pre-established revolution speed, varying the quantity of air and fuel injected or varying the spark advance of the engine.
  • Control systems of the tradition type have no information on the resisting load applied to the motor and make corrections as a function of the variation in speed of the motor caused by the variation in resisting torque. In practice, the correction is made after having detected the outcome of a variation in resisting torque.
  • the engine has a certain degree of inertia, there is a delay from the moment in which the resisting torque varies to the moment in which the electronic control unit detects a variation in engine speed.
  • the pre-established revolution speed of the engine must be relatively high, so that the inertia of the engine compensates the response times of the idling control system.
  • the problem on which the present invention is based is to reduce the idling revolution speed of an internal combustion engine while preventing the engine from cutting out due to sudden increases in the resisting torque produced by accessory devices.
  • a four cylinder four-stroke internal combustion engine is indicated with 10, provided with an engine shaft 12, mounted on which is a tone wheel 14 associated to a sensor 16, for example of the electromagnetic type, the task of which is to detect the instant revolution speed of the engine shaft 12.
  • the engine 10 is provided with an intake manifold 18 fitted with a throttle valve 20 controlled by the user by means of the accelerator pedal.
  • a by-pass manifold 22 is fitted parallel to the throttle valve 20.
  • a second throttle valve 24 is fitted on the by-pass manifold 22 and is operated by an electric actuator 26.
  • a plurality of injectors 28 are fitted on the intake manifold 18 in relation to the various cylinders of the engine 10.
  • a distributor shaft 30 controls opening and closing of intake and exhaust valves (not illustrated).
  • a tone stroke wheel associated to a sensor 34 that provides a signal indicating the stroke of the engine 10.
  • An electronic control unit 36 receives the signals from the angular velocity sensor 16 and the stroke sensor 34.
  • the electronic control unit 36 is programmed, among other things, to control idling of the engine 10.
  • the control unit 36 corrects the air flow aspirated by the motor 10 in conditions of idling by opening or closing the throttle valve 24 by means of the actuator 26. Simultaneously to the correction of the air flow aspirated, the control unit 36 corrects the quantity of fuel injected modifying the opening time of the injectors 28.
  • C ine C ind - C res -C car that is, the torque of inertia C ine is equal to the difference of the torque developed by the gases C ind and the internal resisting torques C res and load torque C car applied to the engine shaft.
  • the electronic control unit 36 is programmed to acquire, in idling, information relevant to the total resisting torque given by the sum of the components C rot + C res + C car.
  • the load torque C car may be distinguished in two components:
  • the method with which the electronic control unit 36 acquires information relevant to the resisting torque applied to the engine shaft shall be explained subsequently with reference to the diagram in figure 2.
  • the graph indicated with P gives a schematic indication of the variation in pressure inside the combustion chamber during the cycle corresponding to a revolution of 360° of the engine shaft.
  • the maximum of the pressure curve P occurs shortly after the top dead centre indicated in the figure with PMS (TDC).
  • Figure 2 also indicates the variation in torque applied by gases in expansion to the engine shaft.
  • the torque has a negative value in the crank angle interval between 0 (PMS) and -180° and a positive value in the interval of between 0 (PMS) and +180°.
  • the mean value during the cycle of 360° of the torque C from the physical point of view represents the torque of inertia of the rotating masses C rot .
  • the minimum value of the torque may be estimated as the mean value of acceleration in the interval ⁇ (figure 2), the position of which is established as a function of the angular position of the tone wheel.
  • the electronic control unit 36 acquires by means of the velocity sensor 14, 16 information on the estimated resisting torque, given by the sum of two acceleration components: a first which is calculated as the mean value of acceleration of the engine shaft calculated on 360° of crank angle and a second acceleration calculated as the minimum instant value in a pre-established interval ⁇ immediately before the top dead centre.
  • a first which is calculated as the mean value of acceleration of the engine shaft calculated on 360° of crank angle
  • a second acceleration calculated as the minimum instant value in a pre-established interval ⁇ immediately before the top dead centre.
  • the two accelerations are not coherent as scale factors as the former is calculated as the instant value C res + C af ) while C rot is calculated as the mean value.
  • the two components are therefore weighed appropriately by means of calibration parameters. These parameters also compensate delays in control and mechanical and hydrodynamic inertia of the system.
  • the electronic control unit 36 makes corrections in the air flow and the amount of fuel injected according to a mapping established experimentally for the purpose of maintaining the engine revolution speed constant.
  • the control system based on detecting the torque value overrides a control system of the tradition type based on detecting the engine revolution speed.
  • the additional control system more rapidly compensates situations in which variations in load occur as it directly supervises the physical size which is the cause of variations in angular velocity.

Landscapes

  • 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)
  • Control Of Vehicle Engines Or Engines For Specific Uses (AREA)

Claims (3)

  1. Procédé permettant la régulation du ralenti dans un moteur à combustion interne pour véhicules, comprenant les phases suivantes :
    surveiller au moins un paramètre de fonctionnement du moteur, et
    corriger la quantité d'air et de carburant délivrée au moteur en fonction des variations dudit paramètre de fonctionnement, de façon à maintenir le régime du moteur à une valeur sensiblement équivalente à une valeur de référence pré-établie ;
       le procédé étant caractérisé en ce qu'il établit une valeur estimée pour le couple appliqué au moteur en fonction de la valeur d'accélération angulaire détectée pendant un cycle du moteur à combustion interne et pour effectuer une correction sur la quantité d'air et de carburant délivrée au moteur en fonction des variations de ladite valeur de couple estimée.
  2. Procédé selon la revendication 1, caractérisé en ce que le couple estimé appliqué à l'arbre du moteur est établi en fonction de la première valeur d'accélération angulaire mesurée dans un intervalle (Δα) précédant immédiatement la position du point mort haut du moteur et d'une deuxième valeur d'accélération calculée sous la forme de la valeur moyenne pendant un cycle du moteur.
  3. Procédé selon la revendication 2, caractérisé en ce que la première valeur d'accélération susdite est une valeur indicative de la valeur d'accélération minimale pendant un cycle du moteur.
EP00830518A 1999-07-28 2000-07-20 Méthode de régulation de la vitesse de ralenti pour un moteur à combustion interne Expired - Lifetime EP1072778B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT1999TO000663A IT1310644B1 (it) 1999-07-28 1999-07-28 Procedimento per il controllo del regime di minimo di un motore acombustione interna.
ITTO990663 1999-07-28

Publications (3)

Publication Number Publication Date
EP1072778A2 EP1072778A2 (fr) 2001-01-31
EP1072778A3 EP1072778A3 (fr) 2002-08-28
EP1072778B1 true EP1072778B1 (fr) 2003-09-24

Family

ID=11418000

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00830518A Expired - Lifetime EP1072778B1 (fr) 1999-07-28 2000-07-20 Méthode de régulation de la vitesse de ralenti pour un moteur à combustion interne

Country Status (4)

Country Link
EP (1) EP1072778B1 (fr)
DE (1) DE60005444T2 (fr)
ES (1) ES2207483T3 (fr)
IT (1) IT1310644B1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3890902B2 (ja) * 2001-02-22 2007-03-07 トヨタ自動車株式会社 内燃機関燃料供給量設定方法及び装置
US6718255B1 (en) 2002-10-04 2004-04-06 Ford Global Technologies, Llc Method and system for matching engine torque transitions between closed and partially closed accelerator pedal positions
US6820589B2 (en) 2002-10-17 2004-11-23 Ford Global Technologies, Llc Idle speed control method and system
WO2016201011A1 (fr) * 2015-06-08 2016-12-15 Pinnacle Engines, Inc. Commande de distribution de carburant basée sur des fluctuations de vitesse de moteur

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2696431B2 (ja) * 1990-12-17 1998-01-14 株式会社ユニシアジェックス 内燃機関のアイドル回転数制御装置
JP2906770B2 (ja) * 1991-10-14 1999-06-21 日産自動車株式会社 内燃機関の回転数制御装置

Also Published As

Publication number Publication date
ITTO990663A1 (it) 2001-01-28
EP1072778A2 (fr) 2001-01-31
EP1072778A3 (fr) 2002-08-28
IT1310644B1 (it) 2002-02-19
DE60005444T2 (de) 2004-05-06
ES2207483T3 (es) 2004-06-01
DE60005444D1 (de) 2003-10-30
ITTO990663A0 (it) 1999-07-28

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