FR2827552A1 - Measurement of nominal idling speed includes measurement of real speed, and iterative calculation based on engine operating conditions - Google Patents

Measurement of nominal idling speed includes measurement of real speed, and iterative calculation based on engine operating conditions Download PDF

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Publication number
FR2827552A1
FR2827552A1 FR0209266A FR0209266A FR2827552A1 FR 2827552 A1 FR2827552 A1 FR 2827552A1 FR 0209266 A FR0209266 A FR 0209266A FR 0209266 A FR0209266 A FR 0209266A FR 2827552 A1 FR2827552 A1 FR 2827552A1
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FR
France
Prior art keywords
nominal
idle
engine
idling speed
speed
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.)
Withdrawn
Application number
FR0209266A
Other languages
French (fr)
Inventor
Martin Vornehm
Peter Buhrle
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.)
Schaeffler Buehl Verwaltungs GmbH
LuK Lamellen und Kupplungsbau GmbH
Original Assignee
LuK Lamellen und Kupplungsbau Beteiligungs KG
LuK Lamellen und Kupplungsbau GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by LuK Lamellen und Kupplungsbau Beteiligungs KG, LuK Lamellen und Kupplungsbau GmbH filed Critical LuK Lamellen und Kupplungsbau Beteiligungs KG
Publication of FR2827552A1 publication Critical patent/FR2827552A1/en
Withdrawn legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D48/00—External control of clutches
    • F16D48/06—Control by electric or electronic means, e.g. of fluid pressure
    • F16D48/08—Regulating clutch take-up on starting
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W10/00—Conjoint control of vehicle sub-units of different type or different function
    • B60W10/02—Conjoint control of vehicle sub-units of different type or different function including control of driveline clutches
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W10/00—Conjoint control of vehicle sub-units of different type or different function
    • B60W10/04—Conjoint control of vehicle sub-units of different type or different function including control of propulsion units
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W10/00—Conjoint control of vehicle sub-units of different type or different function
    • B60W10/04—Conjoint control of vehicle sub-units of different type or different function including control of propulsion units
    • B60W10/06—Conjoint control of vehicle sub-units of different type or different function including control of propulsion units including control of combustion engines
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W30/00—Purposes of road vehicle drive control systems not related to the control of a particular sub-unit, e.g. of systems using conjoint control of vehicle sub-units
    • B60W30/18—Propelling the vehicle
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W30/00—Purposes of road vehicle drive control systems not related to the control of a particular sub-unit, e.g. of systems using conjoint control of vehicle sub-units
    • B60W30/18—Propelling the vehicle
    • B60W30/1819—Propulsion control with control means using analogue circuits, relays or mechanical links
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D48/00—External control of clutches
    • F16D48/06—Control by electric or electronic means, e.g. of fluid pressure
    • F16D48/064—Control of electrically or electromagnetically actuated clutches
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W2510/00—Input parameters relating to a particular sub-units
    • B60W2510/02—Clutches
    • B60W2510/0208—Clutch engagement state, e.g. engaged or disengaged
    • B60W2510/0225—Clutch actuator position
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W2510/00—Input parameters relating to a particular sub-units
    • B60W2510/06—Combustion engines, Gas turbines
    • B60W2510/0638—Engine speed
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W2710/00—Output or target parameters relating to a particular sub-units
    • B60W2710/06—Combustion engines, Gas turbines
    • B60W2710/0644—Engine speed
    • B60W2710/065—Idle condition
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D2500/00—External control of clutches by electric or electronic means
    • F16D2500/10—System to be controlled
    • F16D2500/102—Actuator
    • F16D2500/1021—Electrical type
    • F16D2500/1023—Electric motor
    • F16D2500/1025—Electric motor with threaded transmission

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Transportation (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Automation & Control Theory (AREA)
  • Electromagnetism (AREA)
  • Hydraulic Clutches, Magnetic Clutches, Fluid Clutches, And Fluid Joints (AREA)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)

Abstract

The instantaneous nominal idling speed is calculated by an iterative process, starting each time from the preceding operating condition. The determination of nominal idling speed is used in control of the engine, operating with an automatic clutch. The process allows determination of the instantaneous nominal idling speed of the engine of a vehicle fitted with an automatic clutch. The instantaneous nominal idling speed is calculated, each time, as a function of the real idling speed, by reference to a known nominal idling speed in a specific operating condition. The nominal value is calculated by an iterative process, starting each time from the preceding operating condition. The process starts with the nominal idling speed when the engine is cold, and this value is reduced as a function of the real conditions when the engine is operating normally.

Description

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Procédé permettant de déterminer le ralenti nominal momentané
L'invention concerne un procédé permettant de déterminer le ralenti nominal momentané d'un moteur d'un véhicule équipé d'un embrayage automatisé, doté en particulier d'une gestion électronique de l'embrayage. Method for determining the nominal momentary idle
The invention relates to a method for determining the momentary nominal idling of an engine of a vehicle equipped with an automated clutch, in particular provided with electronic clutch management.

La connaissance à chaque fois du ralenti nominal momentané est nécessaire, en particulier pour la commande de l'embrayage, pour pouvoir changer de stratégie de conduite de façon souhaitée, de telle sorte que, par exemple, des processus de démarrage ou des processus de conduite en marche rampante soient réalisables concernant un véhicule. Le ralenti nominal momentané est déterminé d'après une courbe caractéristique, en fonction de la température du moteur, dans le cas de procédés connus d'après l'état actuel de la technique. De façon désavantageuse, un détecteur approprié est nécessaire ici, concernant la température du moteur, pour obtenir des signaux appropriés de la température du moteur.  Knowledge of the nominal momentary idle time is required, in particular for clutch control, in order to be able to change the driving strategy as desired, such that, for example, starting processes or driving processes in creeping operation are feasible for a vehicle. The momentary nominal idle speed is determined according to a characteristic curve, as a function of the engine temperature, in the case of methods known from the current state of the art. Disadvantageously, an appropriate sensor is required here, relating to the engine temperature, to obtain appropriate signals of the engine temperature.

De ce fait, le coût de montage concernant le véhicule est élevé. Therefore, the mounting cost for the vehicle is high.

Le but de l'invention est de proposer un procédé permettant de déterminer le ralenti nominal momentané, lequel procédé calcule le ralenti même sans connaître la température du moteur.  The object of the invention is to propose a method making it possible to determine the momentary nominal idling, which method calculates the idling even without knowing the temperature of the engine.

Le but est atteint, conformément à l'invention, par le fait que le ralenti nominal momentané est calculé, à chaque  The object is achieved, in accordance with the invention, by the fact that the momentary nominal idle speed is calculated, at each

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fois, en fonction du ralenti réel, par adaptation d'un ralenti nominal connu lors d'un état de fonctionnement déterminé.  times, as a function of the actual idle speed, by adapting a known nominal idle speed during a determined operating state.

D'après ce qui précède, on propose un procédé conforme à l'invention, avec lequel le ralenti nominal momentané peut être adapté d'après le ralenti momentané, même sans connaître la température du moteur. De cette façon, un détecteur supplémentaire de la température du moteur n'est pas nécessaire, le coût supplémentaire de montage pouvant ainsi être économisé.  From the above, a method is proposed in accordance with the invention, with which the momentary nominal idle speed can be adapted according to the momentary idle speed, even without knowing the engine temperature. In this way, an additional engine temperature sensor is not necessary, which can save the additional mounting cost.

Dans le cadre d'une conception avantageuse de la présente invention, on peut effectuer une détermination itérative du ralenti nominal momentané d'un présent état de fonctionnement, à chaque fois réel, pour pouvoir, de manière avantageuse, se rapprocher de façon asymptotique du ralenti réel.  In the context of an advantageous design of the present invention, it is possible to carry out an iterative determination of the momentary nominal idle of a present operating state, each time real, in order to be able, advantageously, to approach asymmetrically the idle real.

De préférence, on peut utiliser, comme valeur de démarrage, dans le cas d'une détermination itérative, respectivement le ralenti nominal de l'état de fonctionnement précédent, ce ralenti nominal étant adapté en fonction du ralenti réel du présent état de fonctionnement. Ainsi, on peut, avec le procédé conforme à l'invention, calculer un grand nombre de régimes de ralenti nominaux momentanés pour différents états de fonctionnement.  Preferably, it is possible to use, as starting value, in the case of an iterative determination, respectively the nominal idle speed of the previous operating state, this nominal idling being adapted as a function of the real idle speed of the present operating state. Thus, it is possible, with the method according to the invention, to calculate a large number of momentary nominal idling speeds for different operating states.

Par exemple, on peut utiliser, comme première valeur de démarrage, dans le cas de la détermination itérative, le ralenti nominal lorsque le moteur est froid, ce ralenti nominal étant diminué en fonction du régime moteur réel du présent état de fonctionnement. On peut utiliser aussi un autre ralenti servant pour la valeur de démarrage. Si par exemple, entre-temps, le véhicule est resté à l'arrêt et si le moteur lors d'un nouveau démarrage n'est pas complètement refroidi, on peut utiliser, de préférence, comme valeur de démarrage, le ralenti nominal calculé en dernier.  For example, it is possible to use, as the first starting value, in the case of iterative determination, the nominal idling when the engine is cold, this nominal idling being reduced as a function of the actual engine speed of the present operating state. Another idle can also be used for the start value. If, for example, in the meantime, the vehicle has remained stationary and if the engine during a new start is not completely cooled down, the nominal idle speed calculated as latest.

Selon un perfectionnement de l'invention, il peut être prévu que le ralenti nominal, utilisé comme valeur de  According to an improvement of the invention, it can be provided that the nominal idling, used as the value of

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démarrage, soit diminué, si le ralenti réel descend, d'une valeur prédéterminée, en dessous de la limite inférieure du ralenti nominal.  start-up, or decreased, if the actual idle goes down, by a predetermined value, below the lower limit of the nominal idle.

Ainsi, on peut, par exemple, à partir du ralenti nominal, lorsque le moteur est froid, modifier ou diminuer le ralenti nominal momentané, par exemple dans les états de position sur neutre et/ou dans les états de démarrage de la boîte de vitesses pour des états de fonctionnement déterminés, comme par exemple :"embrayage ouvert", "contacteur de ralenti actionné"ou des états analogues.  Thus, it is possible, for example, from the nominal idle, when the engine is cold, to modify or reduce the momentary nominal idle, for example in the states of position on neutral and / or in the states of starting of the gearbox for specific operating states, for example: "clutch open", "idle switch actuated" or similar states.

Le procédé conforme à l'invention peut être utilisé, de préférence, dans le cas de tous les véhicules dotés d'une gestion électronique de l'embrayage (EKM) ou équipés d'un actionneur servant à commander un embrayage automatisé (AK), en particulier si aucun bus de convertisseur analogique/ numérique (CAN) n'est prévu.  The process according to the invention can be used, preferably, in the case of all vehicles equipped with electronic clutch management (EKM) or equipped with an actuator used to control an automated clutch (AK), in particular if no analog / digital converter (ADC) bus is provided.

Les revendications fournies avec la demande sont des propositions de formulations, sans préjuger d'une protection étendue conférée par le brevet. La déposante se réserve le droit de revendiquer d'autres combinaisons de caractéristiques divulguées jusqu'à présent seulement dans la description et/ou dans les dessins.  The claims provided with the application are proposed formulations, without prejudice to the extended protection conferred by the patent. The applicant reserves the right to claim other combinations of characteristics which have so far been disclosed only in the description and / or in the drawings.

Des renvois utilisés dans des sous-revendications font référence à l'autre configuration de l'objet de la revendication principale, par les caractéristiques de la sous-revendication respective ; ces renvois ne doivent pas être interprétés comme étant une renonciation à l'obtention d'une protection indépendante de l'objet pour les combinaisons de caractéristiques contenues dans les sousrevendications ayant fait l'objet de ces renvois.  References used in subclaims refer to the other configuration of the subject matter of the main claim, by the features of the respective subclaim; these references should not be interpreted as a renunciation of obtaining protection independent of the object for the combinations of characteristics contained in the sub-claims which have been the subject of these references.

Etant donné que les objets des sous-revendications peuvent constituer des inventions distinctes et indépendantes en faisant référence à l'état de la technique à la date de priorité, la déposante se réserve le droit d'en faire l'objet de revendications indépendantes ou d'en faire des déclarations de division. En outre, ces objets peuvent  Since the subject-matter of the sub-claims may constitute separate and independent inventions by reference to the state of the art on the priority date, the applicant reserves the right to be the subject of independent claims or claims 'make them into declarations of division. In addition, these objects can

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contenir également des inventions indépendantes qui montrent une conformation indépendante des objets des sousrevendications précédentes.  also contain independent inventions which show an independent conformation of the objects of the preceding claims.

Les exemples de réalisation ne doivent pas être interprétés comme étant une limitation de l'invention. Bien plus, de nombreux changements et de nombreuses modifications sont possibles dans le cadre de la présente divulgation, tels que des variantes, des éléments, des combinaisons et/ou des matériaux que l'homme de l'art peut utiliser, par exemple, en vue de résoudre le problème, en combinant ou en modifiant des caractéristiques ou des éléments ou des étapes de procédés, pris individuellement, en association avec des modes de réalisation ainsi qu'avec des revendications, décrits dans la description générale et contenus dans les dessins, et qui conduisent ainsi à un nouvel objet ou à de nouvelles étapes de procédés ou à de nouvelles suites d'étapes de procédés, par des caractéristiques pouvant être combinées, même là où elles concernent des procédés de fabrication, de contrôle et de travail. The exemplary embodiments should not be interpreted as being a limitation of the invention. Furthermore, many changes and modifications are possible within the scope of this disclosure, such as variations, elements, combinations and / or materials which those skilled in the art can use, for example, with a view to solving the problem, by combining or modifying features or elements or process steps, taken individually, in association with embodiments as well as with claims, described in the general description and contained in the drawings, and which thus lead to a new object or to new process steps or to new sequences of process steps, by characteristics which can be combined, even where they relate to manufacturing, control and working processes.

Claims (5)

REVENDICATIONS 1. Procédé permettant de déterminer le ralenti nominal momentané d'un moteur d'un véhicule équipé d'un embrayage automatisé, doté en particulier d'une gestion électronique de l'embrayage, caractérisé en ce que le ralenti nominal momentané est calculé, à chaque fois, en fonction du ralenti réel, par adaptation d'un ralenti nominal connu lors d'un état de fonctionnement. CLAIMS 1. Method for determining the momentary nominal idle speed of an engine of a vehicle equipped with an automated clutch, provided in particular with electronic clutch management, characterized in that the momentary nominal idle speed is calculated, each time, as a function of the actual idle speed, by adapting a known nominal idle speed during an operating state. 2. Procédé selon la revendication 1, caractérisé en ce que le ralenti nominal momentané est calculé de manière itérative, où on utilise à chaque fois, comme valeur de démarrage, le ralenti nominal de l'état de fonctionnement précédent, ce ralenti nominal étant adapté en fonction du ralenti réel du présent état de fonctionnement. 2. Method according to claim 1, characterized in that the momentary nominal idle is calculated iteratively, where each time, as start-up value, the nominal idle of the previous operating state is used, this nominal idle being adapted based on the actual idle speed of this operating state. 3. Procédé selon la revendication 2, caractérisé en ce que l'on utilise, comme première valeur de démarrage, le ralenti nominal lorsque le moteur est froid, le ralenti nominal étant diminué en fonction du régime moteur réel du présent état de fonctionnement. 3. Method according to claim 2, characterized in that the first idle value is used, the nominal idling when the engine is cold, the nominal idling being reduced as a function of the actual engine speed of the present operating state. 4. Procédé selon l'une quelconque des revendications 1 à 3, caractérisé en ce que le ralenti nominal est diminué si le ralenti réel descend, d'une valeur prédéterminée, en dessous de la limite inférieure du ralenti nominal. 4. Method according to any one of claims 1 to 3, characterized in that the nominal idle is reduced if the real idle drops, by a predetermined value, below the lower limit of the nominal idle. 5. Procédé selon l'une quelconque des revendications 1 à 4, caractérisé en ce que la détermination itérative du ralenti nominal momentané permet de se rapprocher, de façon asymptotique, du ralenti réel.5. Method according to any one of claims 1 to 4, characterized in that the iterative determination of the momentary nominal idle makes it possible to approach, in an asymptotic manner, the real idle.
FR0209266A 2001-07-23 2002-07-22 Measurement of nominal idling speed includes measurement of real speed, and iterative calculation based on engine operating conditions Withdrawn FR2827552A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10135851 2001-07-23
PCT/DE2002/002645 WO2003016699A1 (en) 2001-07-23 2002-07-18 Method for determining the current nominal idling speed

Publications (1)

Publication Number Publication Date
FR2827552A1 true FR2827552A1 (en) 2003-01-24

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FR0209266A Withdrawn FR2827552A1 (en) 2001-07-23 2002-07-22 Measurement of nominal idling speed includes measurement of real speed, and iterative calculation based on engine operating conditions

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BR (1) BR0205789A (en)
DE (1) DE10293604D2 (en)
FR (1) FR2827552A1 (en)
WO (1) WO2003016699A1 (en)

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5759040A (en) * 1980-09-26 1982-04-09 Toyota Motor Corp Intake air flow controlling process in internal combustion engine
DE3130080A1 (en) * 1981-07-30 1983-02-17 Robert Bosch Gmbh, 7000 Stuttgart SPEED CONTROL SYSTEM FOR AN INTERNAL COMBUSTION ENGINE WITH AUTO IGNITION
DE4037772A1 (en) * 1990-11-28 1992-06-04 Bosch Gmbh Robert METHOD AND DEVICE FOR IDLE CONTROL OF AN INTERNAL COMBUSTION ENGINE
DE4327912C1 (en) * 1993-08-19 1994-09-22 Unisia Jecs Corp Engine idling speed control module
US6116213A (en) * 1997-04-25 2000-09-12 Honda Giken Kogyo Kabushiki Kaisha Control system for controlling internal combustion engine
DE10052472A1 (en) * 1999-11-26 2001-05-31 Luk Lamellen & Kupplungsbau Determining vehicle idling speed involves reducing idling speed from start-up characteristic speed at end of driving mode down to current engine speed if vehicle driven during start-up period

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DE10293604D2 (en) 2004-07-01
WO2003016699A1 (en) 2003-02-27
BR0205789A (en) 2003-07-22

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