EP0170574B1 - Verfahren und Vorrichtung zum Steuern des Luftdurchsatzes bei einer Wärmekraftmaschine im Leerlaufzustand - Google Patents

Verfahren und Vorrichtung zum Steuern des Luftdurchsatzes bei einer Wärmekraftmaschine im Leerlaufzustand Download PDF

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Publication number
EP0170574B1
EP0170574B1 EP85401364A EP85401364A EP0170574B1 EP 0170574 B1 EP0170574 B1 EP 0170574B1 EP 85401364 A EP85401364 A EP 85401364A EP 85401364 A EP85401364 A EP 85401364A EP 0170574 B1 EP0170574 B1 EP 0170574B1
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EP
European Patent Office
Prior art keywords
speed
engine
air flow
linked
heat engine
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Expired
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EP85401364A
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English (en)
French (fr)
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EP0170574A1 (de
Inventor
Rémi Lefevre
Gérard Saint-Leger
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Renault SA
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Regie Nationale des Usines Renault
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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
    • 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
    • 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
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/0097—Electrical control of supply of combustible mixture or its constituents using means for generating speed signals

Definitions

  • the present invention relates to a method and a device for controlling the air flow rate at the intake of a heat engine powered by fuel injection in which the air flow rate is regulated as a function of the engine rotation speed. .
  • the invention applies in particular to the regulation of the air flow in the vicinity of the nominal idling speed of a heat engine of a motor vehicle.
  • the idle speed of a heat engine is mainly controlled by the air flow in the intake duct.
  • the richness and the advance it is possible to obtain a stable speed in the absence of disturbances external to the heat engine.
  • the heat engine is asked for additional power to actuate, for example, a peripheral element such as a power steering or another member, the balance of the idle is disturbed and the static adjustment of the speed cannot compensate for the variation. charge imposed.
  • the action on the air flow can be carried out in different ways. This is how you can control an independent valve arranged in bypass on the main intake circuit of the engine. It is also possible to act directly on the throttle valve connected to the vehicle's accelerator control.
  • the object of the present invention is to improve the operation of the regulation of the air flow at the intake, in particular during transient phenomena by providing anticipation in the control of the actuator of the regulation valve.
  • the filtering is preferably carried out by a first order system analogous to a low-pass filter.
  • the gain and the time constant of the first order system used for filtering are preferably chosen so that the overall transfer function brings a maximum phase advance around the maximum frequency of the motor oscillations at its idle speed.
  • the regulation of the air flow at the intake in a heat engine requires a suitably controlled action on the air admitted in the heat engine.
  • To carry out a suitable regulation in the case of a transient phenomenon it is not enough to open the valve below the idling speed, that is to say below the nominal idling speed of the heat engine. , because the action on the intake air would then take place too late to compensate for a rapid drop in engine speed, possibly resulting in an abrupt stop of the engine.
  • FIG 1 there is shown by way of example very schematically a control valve 1 capable of acting on the air admitted into a heat engine not shown.
  • the valve control signal, referenced V comes from a servo system referenced 2 as a whole, carrying out from the input signal s, a cor proportional correction by member 3 and full correction by member 4.
  • the input s of the controlled system 2 would be constituted by the difference between a quantity P linked to the instantaneous value of the speed of rotation of the heat engine and a quantity R linked to the idle speed or nominal speed of rotation of the engine at idle, this value being predetermined for a given engine.
  • this difference e PR, is first of all subjected to a transformation in the regulator 5.
  • the control of the valve 1 is not carried out by directly taking as a reference value the desired constant idle speed linked to the quantity R, but on the contrary, from a fictitious variable reference speed and dependent on the instantaneous speed.
  • the regulator according to the invention comprises a first branch 6 provided with a member 7 behaving like a first order system and with a proportional member 8.
  • the instantaneous engine speed is represented by the value of the instantaneous period P.
  • the idle speed which is a constant, is represented by the idle period R.
  • a filtering of the instantaneous period P is carried out so as to obtain a filtered value P '.
  • This filtering is carried out by the first order system 7 whose input P is linked to the output P 'by the first degree differential equation:
  • the input of the filter 7 is the difference P-R. Due to the fact that the idle period R is constant, the output of the filter 7 is therefore P'-R.
  • the setpoint value chosen for the control of the control valve 1 is a setpoint period C which is constituted by the weighted average between the filtered value of the instantaneous period P 'and the idle period R.
  • This setpoint is therefore chosen by definition as follows:
  • the signal e at the input of the regulator 5 is subjected in a first branch to a first filtering 7 supplying the filtered signal e 'which is then subjected to a proportional member 8 of coefficient K.
  • the same input signal e is subjected in the second branch 9 of the regulator 5 to the faction of a proportional member 10 of coefficient 1.
  • the output of the first branch 6 is subtracted from the output of the second branch 9 so as to provide the output signal s.
  • the transfer function of the servo 2 placed downstream and in series of the regulator 5 is of the form: where Kp is the coefficient of the proportional member 3, while K is the coefficient of the integral member 4.
  • Kp is the coefficient of the proportional member 3
  • K is the coefficient of the integral member 4.
  • FIG. 2 the values of the instantaneous rotational speeds N of a heat engine are shown on the ordinate, that is to say the inverse values of the periods P and on the abscissa the time t.
  • the air intake control valve would be open at time t 2 when the instantaneous speed N becomes equal to the constant and predetermined idling speed N R (intersection B of the curves N and N R ).
  • the instantaneous regime N is filtered so as to obtain a variable filtered regime N 'whose evolution is represented on the curve of FIG. 2 referenced N'.
  • the filtered value is further transformed by carrying out the weighted average which has been explained previously so as to obtain a reference value for the engine speed, the evolution of which is represented by the curve referenced Ne. It is this setpoint which is used as input to the slave system.
  • the action on the control valve occurs at time t l , that is to say at mo ment where the difference between the nominal value Ne and the instantaneous value N is zero, at point A.
  • the invention therefore makes it possible to anticipate the action on the valve control, thus preventing the engine from suddenly stopping in the event of a rapid fall in the instantaneous speed of the heat engine.
  • the input signal consists of the difference between the instantaneous speed (N or P) and the idle speed (N R or R) while according to the invention, the setpoint is constituted by the output s of regulator 5, that is to say the difference between the setpoint speed Ne or its period C and the idle speed (N R or R).
  • FIG. 3 represents the variations of the module or ratio of amplitudes of the output signal to the input signal expressed in decibels as a function of the pulsation expressed in Hertz and represented on a logarithmic scale: If one wishes to attenuate the decrease in gain in the vicinity of low frequencies, it is possible to act on the characteristics of the servo 2, for example by an increase in the integral term K.
  • FIG. 4 represents the variations of the phase expressed in degrees as a function of the pulsation expressed in Hertz on a logarithmic scale.
  • the regulator of the invention provides a phase advance with a maximum which is around 0.7 to 0.8 Hz.
  • the maximum phase advance is around the maximum frequency of the motor oscillations at its idling speed which is generally of the order of 0.5 to 1 Hz.
  • the addition of the regulator of the invention makes it possible to act on the servo-control and for example to open the valve for controlling the admission of air into the heat engine in transient mode, for example in the case of '' a no-load deceleration before the engine speed is lower than the idle 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)
  • Preparation Of Compounds By Using Micro-Organisms (AREA)

Claims (5)

1. Verfahren zum Steuern des Luftdurchsatzes im Einlass einer Wärmekraftmaschine mit Kraftstoffeinspritzung, wobei der Luftdurchsatz als Funktion der Drehgeschwindigkeit des Motors in der Nähe der Nenndrehzahl im Leerlauf gesteuert wird, dadurch gekennzeichnet, dass der Sollwert C der Steuerung aus dem Ergebnis einer Filterung einer Grösse P besteht, die dem Augenblickswert der Drehgeschwindigkeit der Maschine entspricht, gefolgt von einem gewichteten Mittelwert eines gefilterten Wertes P' und einer Grösse R, die der Nenndrehzahl im Leerlauf entspricht, d.h.
Figure imgb0009
wobei K eine Konstante ist.
2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass die Filterung von einem System erster Ordnung durchgeführt wird.
3. Verfahren nach Anspruch 2, dadurch gekennzeichnet, dass die Verstärkung und die Zeitkonstante des Systems erster Ordnung derart gewählt sind, dass die globale Übertragungsfunktion eine Voreilung der Maximalphase in der Umgebung der Maximalfrequenz der Schwingungen der Wärmekraftmaschine bei ihrer Leerlaufdrehzahl bewirkt.
4. Verfahren zur Steuerung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass eine proportionale Integralsteuerung verwendet wird.
5. Vorrichtung zum Steuern des Luftdurchsatzes im Einlass einer Wärmekraftmaschine mit Kraftstoffeinspritzung zur Durchführung des Verfahrens nach einem der vorhergehenden Ansprüche, die eine Anordnung zur Veränderung des Luftdurchsatzes in der Einlassleitung aufweist, sowie eine Betätigungsanordnung, die mit der Anordnung zur Änderung verbunden ist und mit einem Servosystem zum Einführen eines proportionalen Korrektursignals zum Eingangssignal der Betätigungsanordnung, dadurch gekennzeichnet, dass sie ausserdem einen Regler aufweist, der vor dem Servosystem angeordnet ist, dessen Eingang aus dem Abstand besteht zwischen einer Grösse (P), die dem Augenblickswert der Drehgeschwindigkeit der Maschine entspricht und einer Grösse R, die dem Leerlauf entspricht, wobei die Übertragungsfunktion die folgende Formel aufweist:
Figure imgb0010
wobei P ein Laplace-Operator und T und K Konstanten sind.
EP85401364A 1984-07-23 1985-07-05 Verfahren und Vorrichtung zum Steuern des Luftdurchsatzes bei einer Wärmekraftmaschine im Leerlaufzustand Expired EP0170574B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8411667A FR2567961B1 (fr) 1984-07-23 1984-07-23 Procede et dispositif de commande du debit d'air d'un moteur thermique au ralenti
FR8411667 1984-07-23

Publications (2)

Publication Number Publication Date
EP0170574A1 EP0170574A1 (de) 1986-02-05
EP0170574B1 true EP0170574B1 (de) 1988-09-14

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EP85401364A Expired EP0170574B1 (de) 1984-07-23 1985-07-05 Verfahren und Vorrichtung zum Steuern des Luftdurchsatzes bei einer Wärmekraftmaschine im Leerlaufzustand

Country Status (6)

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US (1) US4658782A (de)
EP (1) EP0170574B1 (de)
JP (1) JPH0759906B2 (de)
CA (1) CA1252544A (de)
DE (1) DE3564983D1 (de)
FR (1) FR2567961B1 (de)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62240442A (ja) * 1986-04-09 1987-10-21 Hitachi Ltd 燃料制御装置
JP3876609B2 (ja) * 2000-10-31 2007-02-07 トヨタ自動車株式会社 内燃機関のアイドル回転制御装置
DE10221681B4 (de) * 2002-05-16 2005-12-08 Mtu Friedrichshafen Gmbh Verfahren zur Regelung einer Brennkraftmaschinen-Generator-Einheit

Family Cites Families (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL7012597A (de) * 1970-08-25 1972-02-29
JPS6060025B2 (ja) * 1977-10-19 1985-12-27 株式会社日立製作所 自動車制御方法
DE2906782A1 (de) * 1979-02-22 1980-09-04 Bosch Gmbh Robert Einrichtung zum daempfen von ruckelschwingungen bei einer brennkraftmaschine
GB2051420B (en) * 1979-04-24 1983-12-14 Nissan Motor Intake air flow control system to control idling speed of an internal combustion engine
FR2462562A1 (fr) * 1979-07-26 1981-02-13 Motobecane Ateliers Procede et dispositif pour la regulation automatique du regime d'un moteur a combustion interne
JPS56132430A (en) * 1980-03-24 1981-10-16 Hitachi Ltd Idling rotary speed controller
US4307690A (en) * 1980-06-05 1981-12-29 Rockwell International Corporation Electronic, variable speed engine governor
JPS5759038A (en) * 1980-09-25 1982-04-09 Toyota Motor Corp Intake air flow controlling process in internal combustion engine
DE3039435C2 (de) * 1980-10-18 1984-03-22 Robert Bosch Gmbh, 7000 Stuttgart Vorrichtung zur Regelung der Leerlauf-Drehzahl von Brennkraftmaschinen
US4401075A (en) * 1980-10-27 1983-08-30 The Bendix Corporation Automatic speed control for heavy vehicles
JPS58187556A (ja) * 1982-04-28 1983-11-01 Nippon Denso Co Ltd 内燃機関制御用信号処理装置
DE3232725A1 (de) * 1982-09-03 1984-03-08 Robert Bosch Gmbh, 7000 Stuttgart Regeleinrichtung fuer ein stellwerk bei einer brennkraftmaschine mit selbstzuendung
DE3246524A1 (de) * 1982-12-16 1984-06-20 Robert Bosch Gmbh, 7000 Stuttgart Drehzahlregelsystem fuer eine brennkraftmaschine
FR2538855B1 (fr) * 1982-12-30 1987-05-15 Renault Procede de stabilisation de la vitesse de rotation a vide d'un moteur a allumage commande
JPS606071A (ja) * 1983-06-24 1985-01-12 Toyota Motor Corp 車両用エンジンの点火時期制御装置

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EP0170574A1 (de) 1986-02-05
CA1252544A (fr) 1989-04-11
DE3564983D1 (en) 1988-10-20
FR2567961A1 (fr) 1986-01-24
FR2567961B1 (fr) 1986-12-12
JPH0759906B2 (ja) 1995-06-28
US4658782A (en) 1987-04-21
JPS61135955A (ja) 1986-06-23

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