EP1136680B1 - Vorrichtung zur Erzeugung eines Fahrpedalsignals - Google Patents

Vorrichtung zur Erzeugung eines Fahrpedalsignals Download PDF

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Publication number
EP1136680B1
EP1136680B1 EP01105216A EP01105216A EP1136680B1 EP 1136680 B1 EP1136680 B1 EP 1136680B1 EP 01105216 A EP01105216 A EP 01105216A EP 01105216 A EP01105216 A EP 01105216A EP 1136680 B1 EP1136680 B1 EP 1136680B1
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EP
European Patent Office
Prior art keywords
pedal
output signal
released
pedal position
accelerator
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
EP01105216A
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English (en)
French (fr)
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EP1136680A1 (de
Inventor
Bart Schreurs
Michel Peters
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Delphi Technologies Inc
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Delphi Technologies Inc
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Filing date
Publication date
Application filed by Delphi Technologies Inc filed Critical Delphi Technologies Inc
Publication of EP1136680A1 publication Critical patent/EP1136680A1/de
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Publication of EP1136680B1 publication Critical patent/EP1136680B1/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
    • 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

Definitions

  • the present invention generally relates to a method for generating a pedal output signal of an accelerator pedal.
  • ETC electronic throttle control
  • Such Engines equipped with ETC are for example known from DE 44 03 604 A1, EP 0 962 350 A2 and US 4,881,428. They describe specific control strategies of the throttle valve position based on electronically determined pedal position information.
  • JP 63 134829 describes a throttle valve control device, that aims at removing the fluctuation component of an accelerator operation quantity. This is done by adding hysteresis characteristics to the accelerator operation quantity to be detected by an acceleration quantity detecting means, and transmitting the accelerator operation quantity with the hysteresis characteristics to the ETC.
  • the object of the present invention is to provide a method for generating a pedal output signal for ETC, which permits to reduce engine speed flares and more generally to improve a vehicle's driveability. This object is achieved by a method as claimed in claim 1.
  • a method in accordance with the invention generally concerns the generation of a pedal output signal of an accelerator pedal for electronic load control of an internal combustion engine.
  • the pedal output signal depends on the position of the accelerator pedal. Therefore, a variation of the pedal output signal may be produced by a displacement of said accelerator pedal. It shall be appreciated that, under given conditions, a given absolute variation in said pedal output signal is generated by a different accelerator pedal displacement depending on whether the accelerator pedal is depressed or released. This means that, under given conditions, a different pedal output signal is generated for a same pedal position depending on whether the accelerator pedal has been depressed or released.
  • the pedal output signal is no longer generated so as to simulate a conventional accelerator pedal, i.e. mechanical accelerator pedal, producing a unique response of the engine to a given pedal displacement respectively a given pedal position, irrespective of acceleration or deceleration.
  • the method of the invention permits to generate, in definable conditions, a different pedal output signal for a same pedal position. Therefore, the response of the engine to a pedal displacement can be adapted in function of preferred driving behaviors, thereby improving the driveability of the vehicle.
  • a given absolute variation in said pedal output signal is produced by a shorter accelerator pedal displacement when said accelerator pedal is released than when it is depressed.
  • a pedal output signal indicating an entirely released pedal i.e. an idle output signal, may be generated before the accelerator pedal has been entirely released.
  • a first advantage of this method is that the engine speed will earlier reach the idle engine speed, thereby reducing engine speed flares during gearshifts.
  • an idle output signal can be generated to prevent engine speed flares.
  • An initial pedal movement is to depress the accelerator pedal from the entirely released pedal position.
  • the pedal output signal may be generated according to an acceleration function with the actual pedal position as an argument. Now, if the pedal output signal is generated according to the acceleration function, i.e. the pedal is being depressed, and if the accelerator pedal is suddenly released, then the pedal output signal is generated according to a deceleration function.
  • the deceleration function is steeper than the acceleration function, thereby ensuring a rapid decrease of the pedal output signal to the idle output signal.
  • generating the pedal output signal according to the deceleration function implies an offset in the accelerator pedal.
  • the deceleration function already generates an idle output signal for an offset pedal position different from the entirely released pedal position.
  • the deceleration function may be used to generate the pedal output signal when the pedal has been released and is subsequently depressed. Indeed, using the acceleration function each time that the pedal is depressed and using the deceleration function each time that the accelerator pedal is released would produce discontinuities in the pedal output signal. In case that the pedal has been released and is subsequently depressed, the pedal output signal is therefore preferably generated according to the deceleration function or to a translation thereof, i.e. an analogous function which is parallel shifted, until it reaches the pedal output signal that would be generated according to the acceleration function. Then the pedal output signal will be generated according to the acceleration function.
  • the deceleration function is translated so as to obtain a coherent and continuous pedal output signal. If the accelerator pedal has been released from the offset pedal position to a given pedal position and if it is depressed again, then the pedal output signal is generated according to the deceleration function shifted or translated by a value corresponding to the difference between the offset pedal position and the given pedal position. Hence, this shifted deceleration function generates an idle output signal for said given pedal position and the pedal output signal varies as with the deceleration function when the accelerator pedal is depressed.
  • the method of the invention is implemented in order to generate a pedal output signal of an accelerator pedal in such a way that engine speed flares may be reduced or avoided during gearshifts. Therefore, in this preferred embodiment, under given conditions, a given absolute variation in the pedal output signal is produced by a shorter accelerator pedal displacement when the accelerator pedal is released than when it is depressed.
  • absolute variation here means the absolute value of the variation, i.e. the value of the variation independently of its sign. It follows that a pedal output signal indicating an entirely released pedal, i.e. an idle output signal, may be generated before the accelerator pedal has been entirely released.
  • the pedal output signal is preferably generated according to an acceleration function (face) or to a deceleration (f dec ), depending on the situation.
  • An example for such acceleration and deceleration functions is shown in Fig. 1, where each of the functions is represented by a straight line.Numerical examples will be used for a better understanding of this preferred embodiment of the method of the invention.
  • the pedal output signal (POS) is also assumed to range from 0 to 100%.
  • a pedal output signal of 0% corresponds to an idle output signal.
  • the accelerator pedal is depressed until the pedal position reaches e.g. 50%, and that it is subsequently released from that position, which shall be called switch position. Then, in accordance with the present method, the pedal output signal shall be given by the deceleration function. This means that the pedal output signal was given by f acc and that consequently to the release of the pedal, the pedal output signal is then given by f dec . More generally, this condition shall be respected every time the pedal is released while the pedal output signal is given by f acc .
  • the deceleration function is steeper than the acceleration function.
  • a pedal output signal of 0% i.e. idle output signal
  • f dec 0% when the pedal position reaches an offset pedal position equal to PO, which shall be called offset pedal position.
  • the slope of the deceleration function is a constant. It is preferably about 10% steeper than the slope of the acceleration function. However, in this embodiment, the slope has been set to 1.4 (i.e. 40% steeper) in order to exaggerate the effect of the method.
  • the pedal offset depends on the switch position and is needed to obtain the equation of the deceleration function. Hence the pedal offset is calculated as soon as a release of the pedal is detected and a transition from face to f dec should be performed.
  • the pedal output signal is generated according to the deceleration function.
  • the pedal output signal is advantageously given by f dec as long as the pedal position is between the switch position and the offset pedal position. This ensures a coherent control of the pedal and the continuity of the pedal output signal. Indeed, if f acc was only used for depressed pedals and f dec for released pedals, there would be evident discontinuities in the values of the pedal output signal.
  • the translation may be carried out by modifying the variable PP in the deceleration function f dec by a value corresponding to the pedal displacement between the offset pedal position and the current pedal position. For example, if the pedal is decreased to 7.5%, then POS shall be given by f dec (PP+(14.3-7.5)). In the present embodiment, the same result can be achieved by giving PO the value of the current pedal position.
  • This translated f dec is indicated by reference sign D' in Fig.1. It allows the generation of a coherent pedal output signal since the pedal output signal thus varies as with the initial deceleration function.
  • f dec (PP+(14.3-7.5)) reaches facc(PP) then the pedal output signal is again given by f acc, as previously explained.
  • a convenient way to implement the present method is to adapt it for an on-board computer.
  • the preferred flowchart for programming the method is shown in Fig.2.
  • the pedal position is compared to the old pedal position in order to detect acceleration or deceleration.
  • Fig.3 and Fig.4 graphs representing the pedal position (continuous lines) and the resulting pedal output signal (dashed lines) are shown.
  • the vertical axis represents the percentage of pedal position, resp. of pedal output signal.
  • the horizontal axis indicates the time in ms, the origin of time being arbitrary.
  • each peak corresponds to a gearshift.
  • POS f acc (PP). Therefore in the increasing part of the peak the pedal output signal equals the pedal position.
  • the deceleration function is used.
  • the decreasing part of the second peak is shown in Fig.4.
  • the present method permits, in this example, to reach the idle output signal (0%) 32 ms before the accelerator pedal is entirely released. It follows that engine speed flares can be reduced during gearshifts since an idle output signal is generated before the pedal has been entirely released.
  • the third peak is characteristic of a "driver mistake" which can be corrected with the present method.
  • the driver did not entirely release the accelerator pedal.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Control Of Throttle Valves Provided In The Intake System Or In The Exhaust System (AREA)

Claims (5)

  1. Verfahren zur Erzeugung eines Pedalausgangssignals, das für die Stellung eines Fahrpedals, für die elektronische Belastungssteuerung eines Verbrennungsmotors zu verwendenden darstellend ist, wobei, unter vorgegebenen Bedingungen, eine gegebene absolute Änderung des Pedalausgangssignals durch einen unterschiedlichen Fahrpedalbetätigungsweg erzeugt wird, und zwar je nachdem, ob das Fahrpedal gedrückt oder freigegeben wurde, wobei das Pedalausgangssignal gemäß einer Beschleunigungsfunktion erzeugt werden kann und, wenn das Pedalausgangssignal gemäß der Beschleunigungsfunktion erzeugt wird und eine gedrückte Pedalstellung darstellt, dann wenn das Fahrpedal freigegeben wird, das Pedalausgangssignal gemäß einer Verzögerungsfunktion erzeugt wird, dadurch gekennzeichnet, dass die Verzögerungsfunktion ein Pedalausgangssignal erzeugt, das eine vollständig freigegebene Pedalstellung darstellt, wenn das Pedal bis auf eine Offsetpedalstellung freigegeben wird, die sich von der vollständig freigegebenen Pedalstellung unterscheidet
  2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass dann wenn das Fahrpedal von der Offsetpedalstellung aus noch weiter freigegeben wird, die Verzögerungsfunktion so verschoben wird, dass ein Leerlaufsignalausgang für die tatsächliche Pedalstellung erzeugt wird
  3. Verfahren nach Anspruch 2, dadurch gekennzeichnet, dass wenn das Fahrpedal freigegeben wurde, dann wenn das Fahrpedal gedrückt wird, das Pedalausgangssignal gemäß der Verzögerungsfunktion oder einer Translation derselben erzeugt wird; und dass, wenn das gemäß der Verzögerungsfunktion oder verschobenen Verzögerungsfunktion erzeugte Pedalausgangssignal das Pedalausgangssignal erreicht, das gemäß der Beschleunigungsfunktion erzeugt würde, dann das Pedalausgangssignal gemäß der Beschleunigungsfunktion erzeugt wird
  4. Verfahren nach Anspruch 3, dadurch gekennzeichnet, dass wenn das Fahrpedal von der Offsetpedalstellung aus bis auf eine gegebene Pedalstellung freigegeben wurde und das Fahrpedal anschließend gedrückt wird, dann das Pedalausgangssignal gemäß der Verzögerungsfunktion erzeugt wird, die um einen Wert verschoben wurde, der der Differenz zwischen der Offsetpedalstellung und der gegebenen Pedalstellung entspricht
  5. Verfahren nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass
    die Beschleunigungsfunktion die folgende Form aufweist: facc(Pedalstellung) = A1*Pedalstellung, wobei facc(vollständig freigegebene Pedalstellung)=Leerlaufausgangssignal; und
    die Verzögerungsfunktion die folgende Form aufweist:
    fdec(Pedalstellung) = A2*(Pedalstellung-Pedaloffset), wobei A2>A1 und
    fdec(Offsetpedalstellung)=Leerlaufausgangssignal.
EP01105216A 2000-03-23 2001-03-03 Vorrichtung zur Erzeugung eines Fahrpedalsignals Expired - Lifetime EP1136680B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
LU90555A LU90555B1 (en) 2000-03-23 2000-03-23 Method for generating a pedal output signal of an accelerator pedal
LU90555 2000-03-23

Publications (2)

Publication Number Publication Date
EP1136680A1 EP1136680A1 (de) 2001-09-26
EP1136680B1 true EP1136680B1 (de) 2006-08-23

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EP01105216A Expired - Lifetime EP1136680B1 (de) 2000-03-23 2001-03-03 Vorrichtung zur Erzeugung eines Fahrpedalsignals

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DE (1) DE60122410T2 (de)
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Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63134829A (ja) * 1986-11-26 1988-06-07 Nippon Denso Co Ltd スロツトル弁制御装置

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62298642A (ja) * 1986-06-18 1987-12-25 Honda Motor Co Ltd 内燃エンジンの絞り弁制御装置
FR2631389B1 (fr) * 1988-05-11 1993-05-28 Bendix Electronics Sa Dispositif de commande du papillon d'admission d'air d'un moteur a combustion interne
DE4305737A1 (de) * 1993-02-25 1994-03-03 Daimler Benz Ag Vorrichtung zum Regeln der Fahrgeschwindigkeit eines Kraftfahrzeuges
JP2976766B2 (ja) * 1993-09-16 1999-11-10 トヨタ自動車株式会社 可変気筒エンジンの制御装置
DE4403604C2 (de) * 1994-02-05 1998-02-19 A B Elektronik Gmbh Vorrichtung zur Steuerung der Verstellung einer die Leistung einer Brennkraftmaschine bestimmenden Drosselklappe
FR2718191B1 (fr) * 1994-04-05 1996-06-21 Peugeot Procédé et dispositif de suppression des oscillations longitudinales d'un véhicule automobile à moteur.
JPH09119328A (ja) * 1995-10-26 1997-05-06 Jatco Corp エンジン出力制御装置
DE19825306A1 (de) * 1998-06-05 1999-12-09 Bayerische Motoren Werke Ag Vorrichtung zur Veränderung der Betätigungscharakteristik eines Leistungssteuerorgans

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63134829A (ja) * 1986-11-26 1988-06-07 Nippon Denso Co Ltd スロツトル弁制御装置

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Publication number Publication date
LU90555B1 (en) 2001-09-24
DE60122410D1 (de) 2006-10-05
DE60122410T2 (de) 2007-02-01
EP1136680A1 (de) 2001-09-26

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