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EP0591139B1 - Process and device for controlling the air supply to an internal combustion engine - Google Patents

Process and device for controlling the air supply to an internal combustion engine Download PDF

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Publication number
EP0591139B1
EP0591139B1 EP90912736A EP90912736A EP0591139B1 EP 0591139 B1 EP0591139 B1 EP 0591139B1 EP 90912736 A EP90912736 A EP 90912736A EP 90912736 A EP90912736 A EP 90912736A EP 0591139 B1 EP0591139 B1 EP 0591139B1
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EP
European Patent Office
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EP90912736A
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German (de)
French (fr)
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EP0591139A1 (en
Inventor
Eberhard Schnaibel
Erich Schneider
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Robert Bosch GmbH
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Robert Bosch GmbH
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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
    • F02D11/00—Arrangements for, or adaptations to, non-automatic engine control initiation means, e.g. operator initiated
    • F02D11/06—Arrangements for, or adaptations to, non-automatic engine control initiation means, e.g. operator initiated characterised by non-mechanical control linkages, e.g. fluid control linkages or by control linkages with power drive or assistance
    • F02D11/10—Arrangements for, or adaptations to, non-automatic engine control initiation means, e.g. operator initiated characterised by non-mechanical control linkages, e.g. fluid control linkages or by control linkages with power drive or assistance of the electric type
    • F02D11/105—Arrangements for, or adaptations to, non-automatic engine control initiation means, e.g. operator initiated characterised by non-mechanical control linkages, e.g. fluid control linkages or by control linkages with power drive or assistance of the electric type characterised by the function converting demand to actuation, e.g. a map indicating relations between an accelerator pedal position and throttle valve opening or target engine 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
    • F02D41/24—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means
    • F02D41/26—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means using computer, e.g. microprocessor
    • 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
    • F02D41/045—Detection of accelerating or decelerating state
    • 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
    • F02D41/08—Introducing corrections for particular operating conditions for idling
    • 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
    • F02D2041/1422—Variable gain or coefficients
    • 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

Definitions

  • the invention relates to a method and a device for controlling the air supply to an internal combustion engine.
  • Such a method or such a device is known from DE-OS 26 54 455.
  • An electrical controller is proposed there, which generates a control signal for controlling the air supply to the internal combustion engine via a throttle valve as a function of a predetermined and a measured operating parameter of the motor vehicle.
  • a delay or filter element is provided in the control line, which is to ensure a smooth transition of the measured parameter value to the specified value when the specified value changes.
  • This delay or filter element delays the timing of the control signal of the controller device in the event of a change in the predetermined value that is greater than a threshold value, while the control signal reaches the throttle valve unchanged in the event of changes below the threshold value.
  • the rate of change of the control element position or the control signal for the control element for controlling the air supply can be changed by influencing a filter characteristic or the transmission behavior of a filter in accordance with the value or signal to be filtered and the filtered value or signal.
  • DE-OS 27 51 125 discloses a system for electronically regulating the throttle valve position of an internal combustion engine as a function of a value specified by the accelerator pedal. To improve the Operating behavior of the internal combustion engine is limited by a filter arranged between the position controller and throttle valve control, the rate of change of the throttle valve position.
  • the procedure according to the invention has the advantage that smoothness and driving comfort of the motor vehicle are improved, in particular in the area of the idling state, since changes of smaller amplitude and higher frequency do not take effect, while the control system can follow changes of larger amplitude at high speed. Another advantage is that the procedure according to the invention makes it possible to achieve the improvements without interfering with the controller structure.
  • FIG. 1 shows a block diagram of a device for controlling the air supply to an internal combustion engine
  • FIG. 2 shows a flow diagram of the procedure according to the invention
  • Figure 3 finally describes an example of a typical time profile of the signals occurring.
  • FIG. 1 shows an internal combustion engine 10 with a throttle valve 14 located in the intake pipe 12, which is connected in a rotationally fixed manner to an electrically actuatable actuator 18 via a mechanical connection 16 is.
  • Throttle valve 14, mechanical connection 16 and actuator 18 form the actuator 20 for controlling the air supply to the internal combustion engine.
  • a position transmitter 22 for detecting the position of the control element 20 is also part of the control element.
  • the control element 20 is connected to its input line 24 and via its output line 26 to an engine control system 28. The input line 24 is guided to the actuator 18, the output line 26 to the position transmitter 22.
  • the engine control system 28 which in addition to the control of the air supply shown in FIG. 1 can also carry out the functions of fuel metering and / or ignition, comprises a setpoint generator 30, a position controller 32, a filter module 34, a difference generator 36 and a driver stage 38.
  • the setpoint generator 30 of the engine control system 28 is supplied with measured signals of operating parameters of the internal combustion engine and the motor vehicle via its input lines 40, 42-44 from measured value sensors 46, 48-50.
  • the transducers 46 - 50 it can be, for. B. an accelerator pedal position sensor, which supplies the setpoint generator 30 with a signal representing the accelerator pedal position, an idle switch of the accelerator pedal or the throttle valve, a vehicle speed sensor, an engine temperature sensor, a battery voltage sensor and / or a speed sensor.
  • the output 52 of the setpoint generator is fed to a comparison point 54, the second input of which is linked to the output line 26 of the control element 20 and the output 55 of which is fed to the position controller 32.
  • Its output line 56 connects the position controller 32 to the filter module 34 on the one hand, and to the difference generator 36 on the other hand.
  • the output 58 of the filter module 34 is connected to the driver stage 38 and to a second stage Input of the difference generator 36 out.
  • Another signal line 60 connects difference generator 36 to filter module 34, while the input line 24 of the control element 20, as the output line of the motor control system 28, connects the driver stage 38 to the control element 20.
  • a third input line 62 links the filter module 34 to a transducer 64, which is used to determine certain operating states, in particular the idle state. If the respective operating state can be detected by the measuring sensors 46, 48 to 50, sensor 64 is omitted and line 62 is connected to the corresponding sensor (s) 46 to 50, if necessary.
  • the setpoint generator 30 forms a default value or signal for the position of the actuating element 20. If the engine control system 28 is a control system with the idle speed control function, the output of the default value via the output line 52 takes place only in, for . B. via an idle switch in the throttle valve or in the accelerator pedal, detected idle state instead. In the case of an electronic accelerator pedal system, the default value is formed on the one hand as a function of the accelerator pedal position and on the other hand in the idle state in accordance with the idle control.
  • the position of the actuating element 20 determined by the position transmitter 22 is compared in the comparison point 54 with the preset value and a difference signal between the preset and actual value is sent to the position controller 32 via the line 55, which, depending on this difference signal, outputs a preset value for the position via its output line 56 of the actuator 20 generated.
  • the filter module 34 which via the connecting line 62 in certain operating states determined by the sensor 64, In particular, the idle state, can be activated, the default value of the position controller 32 as the value to be filtered or the signal and input signal of the filter module 34 is influenced by an analog or digital filter arrangement in its time course depending on the output signal of the difference former 36 via the connecting line 60.
  • the filter module 54 is a low-pass analog design with changeable time constants or digital design with changeable filter constants.
  • the filter effect or characteristic or transfer behavior of the filter module 34 is determined by the difference generator 36. Depending on the difference between the value to be filtered (default value of the controller) on line 56 and the filter output signal as a filtered signal on line 58, this forms an output signal indicating the size of the difference, which is output via line 60 to filter module 34.
  • the filter characteristic is set such that the filter constants are changed with increasing size of the difference in such a way that the effect of the filter module 34 on the time profile of the value to be filtered (default value) decreases with increasing difference.
  • the filter output signal forms the control signal of the actuator, the temporal course or rate of change of which is determined by the inventive method described above.
  • the filter effect or the filter characteristic or the transmission behavior of the filter can be influenced almost continuously or in one or more stages depending on predetermined ranges of the difference variable.
  • the filtered output signal is output via the output line 58 to the driver stage 38 of the engine control system 28 and serves as a control signal for actuating the control element 20 via the output line 24 of the engine control system 28 and thus determines, inter alia, the rate of change of the actuating element 20 or the throttle valve 14, the course of the control signal over time determining the rate of change.
  • the filter with difference generator can also be inserted in output line 24, in line 52 of the setpoint generator or in line 54 between the comparison point and position controller.
  • FIG. 2 uses a flow chart to describe the implementation of the procedure according to the invention in a computer.
  • the filter constants C I are initialized in a block 100.
  • the default value output by the controller is now measured as the value to be filtered and the filtered value in block 104 is calculated on the basis of the measured default value and the filter constants loaded in the initialization step.
  • the difference between the value to be filtered and the filtered value is then determined in block 106, whereupon in block 108 the filter constants C I are corrected as a function of the difference determined in block 106. This can e.g. B. using a table or a predetermined function.
  • the execution of the program part begins again with block 102.
  • Filter constants C I can be a single constant (low pass) or several constants of a higher-order filter.
  • FIG. 3 shows an example of a typical course of the stepwise changing of the value to be filtered (solid lines) and filtered value (dashed lines) for small changes in the value to be filtered (FIG. 3a) and for large changes in the value to be filtered (FIG. 3b) .
  • the horizontal axes denote the time, the vertical axes the signal level of the value to be filtered or filtered.
  • FIG. 3a shows changes in the small amplitude and higher frequency of the value to be filtered. If there are small differences between the value to be filtered and the value filtered, the effect of the filter is strong, so that the changes in the value to be filtered do not, or hardly, affect the control signal of the actuating element 20 and thus the position of the throttle valve. In contrast, a dynamic operating case is presented in FIG. 3b.
  • the change in the value to be filtered has a large amplitude, the filtered value reacts quickly to this change and slows down its rate of increase depending on the difference between the value to be filtered and the filtered value by appropriate variation of the filter effect.
  • the change in position of the throttle valve takes a course corresponding to the filtered value.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Computer Hardware Design (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Combined Controls Of Internal Combustion Engines (AREA)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)

Abstract

The proposal is for a process and device for controlling the air supply to an internal combustion engine of a motor vehicle in which filtered values for regulating the position of the setting component are generated from the predetermined values formed dependently upon operating parameters of the internal combustion engine and/or the motor vehicle as values to be filtered and the rate of change of the setting component position as dictated by the filtered values and those to be filtered, especially their difference, can be changed by acting on the filter characteristic or the transmission behaviour.

Description

Stand der TechnikState of the art

Die Erfindung bezieht sich auf ein Verfahren und eine Vorrichtung zur Steuerung der Luftzufuhr zu einer Brennkraftmaschine.The invention relates to a method and a device for controlling the air supply to an internal combustion engine.

Ein derartiges Verfahren bzw. eine derartige Vorrichtung ist aus der DE-OS 26 54 455 bekannt. Dort wird ein elektrischer Regler vorgeschlagen, der in Abhängigkeit eines vorgegebenen und eines gemessenen Betriebsparameters des Kraftfahrzeugs ein Steuersignal zur Steuerung der Luftzufuhr zur Brennkraftmaschine über eine Drosselklappe erzeugt. Dabei ist in der Steuerleitung ein Verzögerungs- oder Filterelement vorgesehen, das bei Änderungen des vorgegebenen Wertes einen sanften Übergang des gemessenen Parameterwertes auf den vorgegebenen Wert gewährleisten soll. Dieses Verzögerungs- oder Filterelement verzögert bei einer Änderung des vorgegebenen Wertes, die größer als ein Schwellwert ist, das Steuersignal der Reglereinrichtung in seinem zeitlichen Verlauf, während bei Änderungen unterhalb des Schwellwertes das Steuersignal unverändert zur Drosselklappe gelangt. Durch ein derartiges Vorgehen kann zwar der gewünschte sanfte Übergang erzielbar sein, kleine Schwankungen bzw. Änderungen im vorgegebenen Wert wirken sich jedoch unbeeinflußt auf die Stellung der Drosselklappe und damit Drehzahl und Leistung der Brennkraftmaschine aus, was insbesondere im Leerlaufzustand eine Verschlechterung des Fahrkomforts zur Folge haben kann. Große Änderungen kommen dagegen lediglich verzögert zur Wirkung, was einen Verlust an Dynamik des Steuer-/Regelsystems bedeutet.Such a method or such a device is known from DE-OS 26 54 455. An electrical controller is proposed there, which generates a control signal for controlling the air supply to the internal combustion engine via a throttle valve as a function of a predetermined and a measured operating parameter of the motor vehicle. In this case, a delay or filter element is provided in the control line, which is to ensure a smooth transition of the measured parameter value to the specified value when the specified value changes. This delay or filter element delays the timing of the control signal of the controller device in the event of a change in the predetermined value that is greater than a threshold value, while the control signal reaches the throttle valve unchanged in the event of changes below the threshold value. Such an approach can the desired smooth transition can be achieved, however, small fluctuations or changes in the predetermined value have no influence on the position of the throttle valve and thus the speed and power of the internal combustion engine, which can result in a deterioration in driving comfort, particularly when idling. Large changes, on the other hand, only come into effect with a delay, which means a loss of dynamics of the control system.

Es ist daher Aufgabe der Erfindung, ein Verfahren bzw. eine Vorrichtung zur Steuerung der Luftzufuhr zu einer Brennkraftmaschine mit größtmöglicher Dynamik und verbessertem Fahrkomfort zu schaffen. Diese Aufgabe wird durch die in den unabhängigen Patentansprüche beschriebene Vorgehensweise gelöst. Dabei wird die Änderungsgeschwindigkeit der Stellelementstellung bzw. das Ansteuersignal für das Stellelement zur Steuerung der Luftzufuhr durch Beeinflussung einer Filtercharakteristik bzw. des Übertragungsverhaltens eines Filters nach Maßgabe des zu filternden Wertes oder Signales und des gefilterten Wertes oder Signals veränderbar ist.It is therefore an object of the invention to provide a method and a device for controlling the air supply to an internal combustion engine with the greatest possible dynamics and improved driving comfort. This object is achieved by the procedure described in the independent claims. The rate of change of the control element position or the control signal for the control element for controlling the air supply can be changed by influencing a filter characteristic or the transmission behavior of a filter in accordance with the value or signal to be filtered and the filtered value or signal.

Aus der DE-OS 36 34 551 ist ein Verfahren zur Filterung des Lastsignals bzw. der Grundmenge einer Kraftstoffzumessungseinrichtung bekannt. Dabei wird um das gemessene, unbeeinflußte Lastsignal ein Unempfindlichkeitsbereich gebildet, das gefilterte Signal mittels eines Fensterkomparators mit den Grenzen dieses Unempfindlichkeitsbereichs verglichen und die Filterwirkung abgeschaltet, wenn das gefilterte Signal den Unempfindlichkeitsbereich verläßt.From DE-OS 36 34 551 a method for filtering the load signal or the basic quantity of a fuel metering device is known. An insensitivity range is formed around the measured, uninfluenced load signal, the filtered signal is compared with the limits of this insensitivity range by means of a window comparator, and the filter effect is switched off when the filtered signal leaves the insensitivity range.

Aus der DE-OS 27 51 125 ist ein System zur elektronischen Regelung der Drosselklappenposition einer Brennkraftmaschine in Abhängigkeit eines vom Fahrpedal vorgegebenen Werts bekannt. Zur Verbesserung des Betriebsverhaltens der Brennkraftmaschine wird durch ein zwischen Lageregler und Drosselklappenansteuerung angeordnetes Filter eine Begrenzung der Änderungsgeschwindigkeit der Drosselklappenposition vorgenommen.DE-OS 27 51 125 discloses a system for electronically regulating the throttle valve position of an internal combustion engine as a function of a value specified by the accelerator pedal. To improve the Operating behavior of the internal combustion engine is limited by a filter arranged between the position controller and throttle valve control, the rate of change of the throttle valve position.

Vorteile der ErfindungAdvantages of the invention

Die erfindungsgemäße Vorgehensweise hat den Vorteil, daß Laufruhe und Fahrkomfort des Kraftfahrzeugs insbesondere im Bereich des Leerlaufzustandes verbessert werden, da Änderungen kleinerer Amplitude und höherer Frequenz nicht zur Wirkung gelangen, während das Steuer-/Regelsystem Änderungen größerer Amplitude mit hoher Geschwindigkeit folgen kann. Ein weiterer Vorteil ist darin zu sehen, daß die erfindungsgemäße Vorgehensweise es ermöglicht, die Verbesserungen ohne Eingriff in die Reglerstruktur zu erzielen.The procedure according to the invention has the advantage that smoothness and driving comfort of the motor vehicle are improved, in particular in the area of the idling state, since changes of smaller amplitude and higher frequency do not take effect, while the control system can follow changes of larger amplitude at high speed. Another advantage is that the procedure according to the invention makes it possible to achieve the improvements without interfering with the controller structure.

Weitere Vorteile der Erfindung ergeben sich aus den Unteransprüchen in Verbindung mit der nachfolgenden Beschreibung eines Ausführungsbeispiels.Further advantages of the invention result from the subclaims in connection with the following description of an embodiment.

Zeichnungdrawing

Figur 1 zeigt ein Blockschaltbild einer Vorrichtung zur Steuerung der Luftzufuhr zu einer Brennkraftmaschine, während Figur 2 ein Flußdiagramm der erfindungsgemäßen Vorgehensweise darstellt. Figur 3 schließlich beschreibt beispielhaft einen typischen Zeitverlauf der auftretenden Signale.FIG. 1 shows a block diagram of a device for controlling the air supply to an internal combustion engine, while FIG. 2 shows a flow diagram of the procedure according to the invention. Figure 3 finally describes an example of a typical time profile of the signals occurring.

Beschreibung eines AusführungsbeispielsDescription of an embodiment

Figur 1 zeigt eine Brennkraftmaschine 10 mit einer im Ansaugrohr 12 befindlichen Drosselklappe 14, die über eine mechanische Verbindung 16 drehfest mit einem elektrisch betätigbaren Stellglied 18 verbunden ist. Drosselklappe 14, mechanische Verbindung 16 und Stellglied 18 bilden das Stellelement 20 zur Steuerung der Luftzufuhr zur Brennkraftmaschine. Ein Stellungsgeber 22 zur Erfassung der Stellung des Stellelements 20 ist ebenfalls Bestandteil des Stellelements. Das Stellelement 20 ist mit seiner Eingangsleitung 24 und über seine Ausgangsleitung 26 mit einem Motorsteuerungssystem 28 verbunden. Dabei ist die Eingangsleitung 24 auf das Stellglied 18, die Ausgangsleitung 26 auf den Stellungsgeber 22 geführt.FIG. 1 shows an internal combustion engine 10 with a throttle valve 14 located in the intake pipe 12, which is connected in a rotationally fixed manner to an electrically actuatable actuator 18 via a mechanical connection 16 is. Throttle valve 14, mechanical connection 16 and actuator 18 form the actuator 20 for controlling the air supply to the internal combustion engine. A position transmitter 22 for detecting the position of the control element 20 is also part of the control element. The control element 20 is connected to its input line 24 and via its output line 26 to an engine control system 28. The input line 24 is guided to the actuator 18, the output line 26 to the position transmitter 22.

Das Motorsteuerungssystem 28, das neben der in Figur 1 dargestellten Steuerung der Luftzufuhr auch die Funktionen Kraftstoffzumessung und/oder Zündung durchführen kann, umfaßt einen Sollwertbildner 30, einen Lageregler 32, einen Filterbaustein 34, einen Differenzbildner 36 sowie eine Treiberstufe 38.The engine control system 28, which in addition to the control of the air supply shown in FIG. 1 can also carry out the functions of fuel metering and / or ignition, comprises a setpoint generator 30, a position controller 32, a filter module 34, a difference generator 36 and a driver stage 38.

Dem Sollwertbildner 30 des Motorsteuerungssystems 28 werden über dessen Eingangsleitungen 40, 42 - 44 von Meßwertaufnehmern 46, 48 - 50 Meßsignale von Betriebsparametern der Brennkraftmaschine und des Kraftfahrzeugs zugeführt. Bei den Meßwertaufnehmern 46 - 50 kann es sich z. B. um einen Fahrpedalstellungsgeber, der dem Sollwertbildner 30 ein die Fahrpedalstellung repräsentierendes Signal zuführt, um einen Leerlaufschalter des Fahrpedals bzw. der Drosselklappe, um einen Fahrgeschwindigkeitsgeber, um einen Motortemperaturfühler, einen Batteriespannungsmesser und/oder einen Drehzahlfühler handeln. Der Ausgang 52 des Sollwertbildners ist auf eine Vergleichsstelle 54 geführt, deren zweiter Eingang mit der Ausgangsleitung 26 des Stellelements 20 verknüpft ist und deren Ausgang 55 auf den Lageregler 32 geführt wird. Dessen Ausgangsleitung 56 verbindet einerseits den Lageregler 32 mit dem Filterbaustein 34, andererseits mit dem Differenzbildner 36. Der Ausgang 58 des Filterbausteins 34 wird auf die Treiberstufe 38 sowie auf einen zweiten Eingang des Differenzbildners 36 geführt. Eine weitere Signalleitung 60 verbindet Differenzbildner 36 mit Filterbaustein 34, während die Eingangsleitung 24 des Stellelements 20 als Ausgangsleitung des Motorsteuerungssystems 28 die Treiberstufe 38 mit dem Stellelement 20 verbindet. Eine dritte Eingangsleitung 62 verknüpft den Filterbaustein 34 mit einem Meßwertaufnehmer 64, der zur Feststellung bestimmter Betriebszustände, insbesondere des Leerlaufzustands, dient. Ist der jeweilige Betriebszustand von den Meßwertaufnehmern 46, 48 bis 50 erfaßbar, so entfällt Aufnehmer 64 und Leitung 62 ist gegebenenfalls mit dem/den entsprechenden Aufnehmern 46 bis 50 verbunden.The setpoint generator 30 of the engine control system 28 is supplied with measured signals of operating parameters of the internal combustion engine and the motor vehicle via its input lines 40, 42-44 from measured value sensors 46, 48-50. In the transducers 46 - 50 it can be, for. B. an accelerator pedal position sensor, which supplies the setpoint generator 30 with a signal representing the accelerator pedal position, an idle switch of the accelerator pedal or the throttle valve, a vehicle speed sensor, an engine temperature sensor, a battery voltage sensor and / or a speed sensor. The output 52 of the setpoint generator is fed to a comparison point 54, the second input of which is linked to the output line 26 of the control element 20 and the output 55 of which is fed to the position controller 32. Its output line 56 connects the position controller 32 to the filter module 34 on the one hand, and to the difference generator 36 on the other hand. The output 58 of the filter module 34 is connected to the driver stage 38 and to a second stage Input of the difference generator 36 out. Another signal line 60 connects difference generator 36 to filter module 34, while the input line 24 of the control element 20, as the output line of the motor control system 28, connects the driver stage 38 to the control element 20. A third input line 62 links the filter module 34 to a transducer 64, which is used to determine certain operating states, in particular the idle state. If the respective operating state can be detected by the measuring sensors 46, 48 to 50, sensor 64 is omitted and line 62 is connected to the corresponding sensor (s) 46 to 50, if necessary.

Der Sollwertbildner 30 bildet in Abhängigkeit seiner Eingangssignale einen Vorgabewert bzw. -signal für die Stellung des Stellelements 20. Handelt es sich bei dem Motorsteuerungssystem 28 um ein Steuerungssystem mit der Funktion Leerlaufregelung, so findet die Ausgabe des Vorgabewertes über die Ausgangsleitung 52 nur im, z. B. über einen Leerlaufschalter in der Drosselklappe oder im Fahrpedal, erkannten Leerlaufzustand statt. Bei einem elektronischen Gaspedalsystem wird der Vorgabewert zum einen in Abhängigkeit der Fahrpedalstellung, zum anderen im Leerlaufzustand entsprechend der Leerlaufregelung gebildet.Depending on its input signals, the setpoint generator 30 forms a default value or signal for the position of the actuating element 20. If the engine control system 28 is a control system with the idle speed control function, the output of the default value via the output line 52 takes place only in, for . B. via an idle switch in the throttle valve or in the accelerator pedal, detected idle state instead. In the case of an electronic accelerator pedal system, the default value is formed on the one hand as a function of the accelerator pedal position and on the other hand in the idle state in accordance with the idle control.

Die vom Stellungsgeber 22 ermittelte Position des Stellelements 20 wird in der Vergleichsstelle 54 mit dem Vorgabewert verglichen und über die Leitung 55 ein Differenzsignal zwischen Vorgabe- und Istwert an den Lageregler 32 abgegeben, der in Abhängigkeit dieses Differenzsignals über seine Ausgangsleitung 56 einen Vorgabewert für die Stellung des Stellelements 20 erzeugt.The position of the actuating element 20 determined by the position transmitter 22 is compared in the comparison point 54 with the preset value and a difference signal between the preset and actual value is sent to the position controller 32 via the line 55, which, depending on this difference signal, outputs a preset value for the position via its output line 56 of the actuator 20 generated.

Im Filterbaustein 34, der über die Verbindungsleitung 62 in bestimmten, durch den Meßwertaufnehmer 64 festgestellten Betriebszuständen, insbesondere dem Leerlaufzustand, aktivierbar ist, wird der Vorgabewert des Lagereglers 32 als der zu filternde Wert bzw. Signal und Eingangssignal des Filterbausteins 34 durch eine analoge oder digitale Filteranordnung in seinem zeitlichen Verlauf abhängig von dem über die Verbindungsleitung 60 anliegenden Ausgangssignal des Differenzbildners 36 beeinflußt. Im einfachsten Fall handelt es sich bei dem Filterbaustein 54 um einen Tiefpaß analoger Ausführung mit veränderbaren Zeitkonstanten oder digitaler Ausführung mit veränderbaren Filterkonstanten.In the filter module 34, which via the connecting line 62 in certain operating states determined by the sensor 64, In particular, the idle state, can be activated, the default value of the position controller 32 as the value to be filtered or the signal and input signal of the filter module 34 is influenced by an analog or digital filter arrangement in its time course depending on the output signal of the difference former 36 via the connecting line 60. In the simplest case, the filter module 54 is a low-pass analog design with changeable time constants or digital design with changeable filter constants.

Die Filterwirkung bzw. -charakteristik oder Übertragungsverhalten des Filterbausteins 34 wird vom Differenzbildner 36 bestimmt. Dieser bildet in Abhängigkeit der Differenz zwischen dem zu filternden Wert (Vorgabewert des Reglers) auf der Leitung 56 und dem Filterausgangssignal als gefiltertem Signal auf der Leitung 58 ein die Größe der Differenz anzeigendes Ausgangssignal, das über die Leitung 60 an den Filterbaustein 34 abgegeben wird. Dabei wird die Filtercharakteristik derart eingestellt, daß mit zunehmender Größe der Differenz die Filterkonstanten derart verändert werden, daß die Wirkung des Filterbausteins 34 auf den zeitlichen Verlauf des zu filternden Wertes (Vorgabewertes) mit zunehmender Differenz abnimmt. Das Filterausgangssignal bildet dabei das Ansteuersignal des Stellgliedes, dessen zeitlicher Verlauf bzw. Änderungsgeschwindigkeit durch das oben dargestellte, erfindungsgemäße Verfahren bestimmt wird.The filter effect or characteristic or transfer behavior of the filter module 34 is determined by the difference generator 36. Depending on the difference between the value to be filtered (default value of the controller) on line 56 and the filter output signal as a filtered signal on line 58, this forms an output signal indicating the size of the difference, which is output via line 60 to filter module 34. The filter characteristic is set such that the filter constants are changed with increasing size of the difference in such a way that the effect of the filter module 34 on the time profile of the value to be filtered (default value) decreases with increasing difference. The filter output signal forms the control signal of the actuator, the temporal course or rate of change of which is determined by the inventive method described above.

Die Beeinflussung der Filterwirkung bzw. der Filtercharakteristik oder des Übertragungsverhaltens des Filters kann dabei nahezu stetig oder in einer oder mehreren Stufen in Abhängigkeit von vorgegebenen Bereichen der Differenzgröße erfolgen.The filter effect or the filter characteristic or the transmission behavior of the filter can be influenced almost continuously or in one or more stages depending on predetermined ranges of the difference variable.

Das gefilterte Ausgangssignal wird über die Ausgangsleitung 58 an die Treiberstufe 38 des Motorsteuerungssystems 28 abgegeben und dient als Ansteuersignal zur Betätigung des Stellelements 20 über die Ausgangsleitung 24 des Motorsteuerungssystems 28 und bestimmt somit u.a. die Änderungsgeschwindigkeit von Stellelement 20 bzw. der Drosselklappe 14, wobei der zeitliche Verlauf des Ansteuersignals die Änderungsgeschwindigkeit bestimmt.The filtered output signal is output via the output line 58 to the driver stage 38 of the engine control system 28 and serves as a control signal for actuating the control element 20 via the output line 24 of the engine control system 28 and thus determines, inter alia, the rate of change of the actuating element 20 or the throttle valve 14, the course of the control signal over time determining the rate of change.

Das Filter mit Differenzbildner kann auch in der Ausgangsleitung 24, in der Leitung 52 des Sollwertbildners oder in der Leitung 54 zwischen Vergleichsstelle und Lageregler eingefügt werden.The filter with difference generator can also be inserted in output line 24, in line 52 of the setpoint generator or in line 54 between the comparison point and position controller.

Figur 2 beschreibt anhand eines Flußdiagramms die Realisierung der erfindungsgemäßen Vorgehensweise in einem Rechner. Nach dem Start des dargestellten Programmteils wird in einem Block 100 die Initialisierung der Filterkonstanten CI vorgenommen. Im Funktionsblock 102 wird nun der vom Regler ausgegebene Vorgabewert als der zu filternde Wert gemessen und der gefilterte Wert im Block 104 aufgrund des gemessenen Vorgabewertes und der im Initialisierungsschritt geladenen Filterkonstanten berechnet. Danach wird in Block 106 die Differenz zwischen zu filterndem und gefiltertem Wert ermittelt, worauf im Block 108 die Filterkonstanten CI als Funktion der im Block 106 ermittelten Differenz korrigiert werden. Dies kann z. B. anhand einer Tabelle oder einer vorgegebenen Funktion durchgeführt werden. Nach Abarbeitung des Blocks 108 beginnt der Durchlauf des Programmteils mit Block 102 erneut.FIG. 2 uses a flow chart to describe the implementation of the procedure according to the invention in a computer. After the start of the illustrated program part, the filter constants C I are initialized in a block 100. In function block 102, the default value output by the controller is now measured as the value to be filtered and the filtered value in block 104 is calculated on the basis of the measured default value and the filter constants loaded in the initialization step. The difference between the value to be filtered and the filtered value is then determined in block 106, whereupon in block 108 the filter constants C I are corrected as a function of the difference determined in block 106. This can e.g. B. using a table or a predetermined function. After execution of block 108, the execution of the program part begins again with block 102.

Unter Filterkonstanten CI kann es sich um eine einzelne Konstante (Tiefpaß) oder um mehrere Konstanten eines höherwertigen Filters handeln.Filter constants C I can be a single constant (low pass) or several constants of a higher-order filter.

In Figur 3 ist beispielhaft ein typischer Verlauf des stufenweise sich verändernden des zu filternden (durchgezogene Linien) und gefilterten Wertes (gestrichelte Linien) für kleine Änderungen des zu filternden Wertes (Figur 3a) und für große Änderungen des zu filternden Wertes (Figur 3b) dargestellt. Dabei bezeichnen die horizontalen Achsen die Zeit, die vertikalen Achsen den Signalpegel des zu filternden bzw. gefilterten Wertes.FIG. 3 shows an example of a typical course of the stepwise changing of the value to be filtered (solid lines) and filtered value (dashed lines) for small changes in the value to be filtered (FIG. 3a) and for large changes in the value to be filtered (FIG. 3b) . The horizontal axes denote the time, the vertical axes the signal level of the value to be filtered or filtered.

Figur 3a zeigt Änderungen kleiner Amplitude und höherer Frequenz des zu filternden Wertes. Bei kleinen Differenzen zwischen zu filterndem und gefiltertem Wert ist die Wirkung des Filters stark, so daß die Änderungen im zu filternden Wert nicht bzw. kaum auf das Ansteuersignal des Stellelements 20 und somit auf die Stellung der Drosselklappe durchschlagen. Im Gegensatz dazu wird in Figur 3b ein dynamischer Betriebsfall vorgestellt. Die Änderung im zu filternden Wert hat eine große Amplitude, der gefilterte Wert reagiert auf diese Änderung schnell und verlangsamt seine Anstiegsgeschwindigkeit abhängig von der Differenz zwischen zu filterndem und gefiltertem Wert durch entsprechende Variation der Filterwirkung. Die Stellungsänderung der Drosselklappe nimmt einen dem gefilterten Wert entsprechenden Verlauf.FIG. 3a shows changes in the small amplitude and higher frequency of the value to be filtered. If there are small differences between the value to be filtered and the value filtered, the effect of the filter is strong, so that the changes in the value to be filtered do not, or hardly, affect the control signal of the actuating element 20 and thus the position of the throttle valve. In contrast, a dynamic operating case is presented in FIG. 3b. The change in the value to be filtered has a large amplitude, the filtered value reacts quickly to this change and slows down its rate of increase depending on the difference between the value to be filtered and the filtered value by appropriate variation of the filter effect. The change in position of the throttle valve takes a course corresponding to the filtered value.

Neben der Differenzbildung ist es möglich, eine Divisions-, Multiplikations- oder Additions-operation zur Ableitung eines die Filterwirkung beeinflussendes Signals zu verwenden.In addition to forming the difference, it is possible to use a division, multiplication or addition operation to derive a signal influencing the filter effect.

Claims (11)

  1. Process for the control of the air supply to the internal combustion engine (10) of a motor vehicle, via an electrically operable actuating element (20), the position of which is adjustable for the control of the air supply, in which filtered values or signals can be generated from default values or signals as values or signals to be filtered, and in which the actuating element position is controlled depending on these filtered values or signals by an appropriate control signal (24), with the speed of change of the actuating element position and the progression of the control signal for influencing the filter characteristics or the filter transmission behaviour (34) being variable in accordance-with the values to be filtered (56) and the filtered values (58).
  2. Process in accordance with claim 1. characterized by the fact that the speed of change of the actuating element position is dependent on the difference between the value to be filtered and the filtered value.
  3. Process in accordance with one of the preceding claims, characterized by the fact that type and strength of influence exerted on the filter characteristics or on the transmission behaviour, or the filter effect, depends on the difference between the value to be filtered and the filtered value, in which the filter effect changes contrary to the difference.
  4. Process in accordance with claim 3, characterized by the fact that influencing of the filter effect takes place in the idling condition of the internal combustion engine.
  5. Process in accordance with one of the preceding claims, characterized by the fact that the filtered values are generated from the values to be filtered, in an analog or a digital filter.
  6. Process in accordance with one of the preceding claims, characterized by the fact that the values to be filtered are dependent on the operating parameters, such as the number of revolutions, accelerator pedal position, engine temperature, battery voltage, and/or recognition of idling.
  7. Device for the control of the air supply to the internal combustion engine (10) of a motor vehicle, with an electrically operable air supply actuating element (20), the position of which can be adjusted for the control of the air supply, with a unit (30) for forming default values or signals, with a unit (34) for generating filtered values or signals from these default values or signals, to constitute values or signals to be filtered, in which the actuating element position is adjusted in line with these filtered values or signals, with means (34, 36) being available which alter the speed of change of the actuating element position and the progression of the control signal by influencing the filter characteristics or the filter transmission behaviour in accordance with the value or signal to be filtered and the filtered value or signal.
  8. Device in accordance with claim 7, characterized by the fact that the means for controlling the speed of change of the actuating element position influence the speed of change of the actuating element position depending on the difference between the values to be filtered and the filtered values, in which the generation of the filtered values, the filter effect and the filter characteristics or the transmission behaviour is variable, depending on this difference, such that the filter effect changes contrary to the difference.
  9. Device in accordance with claim 7 or 8, characterized by the fact that the means for influencing the speed of change can be activated on recognition of the idling condition.
  10. Device in accordance with one of the preceding claims, characterized by the fact that means are available for forming the default values or the values to be filtered in relation to operating parameters of the internal combustion engine or of the motor vehicle, such as accelerator pedal position, number of revolutions, battery voltage, engine temperature, etc.
  11. Device in accordance with one of the preceding claims, characterized by the fact that the filtered values are produced in an analog or a digital filter.
EP90912736A 1989-09-30 1990-09-12 Process and device for controlling the air supply to an internal combustion engine Expired - Lifetime EP0591139B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE3932763 1989-09-30
DE3932763A DE3932763C1 (en) 1989-09-30 1989-09-30
PCT/DE1990/000699 WO1991005155A1 (en) 1989-09-30 1990-09-12 Process and device for controlling the air supply to an internal combustion engine

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EP0591139A1 EP0591139A1 (en) 1994-04-13
EP0591139B1 true EP0591139B1 (en) 1995-12-06

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EP (1) EP0591139B1 (en)
JP (1) JP2869185B2 (en)
KR (1) KR0152281B1 (en)
BR (1) BR9007693A (en)
DE (1) DE3932763C1 (en)
ES (1) ES2080156T3 (en)
WO (1) WO1991005155A1 (en)

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WO1991005155A1 (en) 1991-04-18
EP0591139A1 (en) 1994-04-13
BR9007693A (en) 1992-07-07
KR920703984A (en) 1992-12-18
DE3932763C1 (en) 1990-08-02
KR0152281B1 (en) 1998-10-01
ES2080156T3 (en) 1996-02-01
US5265570A (en) 1993-11-30
JP2869185B2 (en) 1999-03-10

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