DE102010028546A1 - Method for reducing engine torque in motor vehicle, involves allowing dynamically adaptive maximum permissible engine torque limit value between maximum possible engine torque and maximum permissible drive train torque - Google Patents

Method for reducing engine torque in motor vehicle, involves allowing dynamically adaptive maximum permissible engine torque limit value between maximum possible engine torque and maximum permissible drive train torque Download PDF

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Publication number
DE102010028546A1
DE102010028546A1 DE102010028546A DE102010028546A DE102010028546A1 DE 102010028546 A1 DE102010028546 A1 DE 102010028546A1 DE 102010028546 A DE102010028546 A DE 102010028546A DE 102010028546 A DE102010028546 A DE 102010028546A DE 102010028546 A1 DE102010028546 A1 DE 102010028546A1
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Prior art keywords
engine torque
maximum permissible
grenz
torque
drive train
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DE102010028546A
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DE102010028546B4 (en
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Dr. Schinnerl Michael
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Bayerische Motoren Werke AG
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Bayerische Motoren Werke AG
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/02—Circuit arrangements for generating control signals
    • F02D41/021—Introducing corrections for particular conditions exterior to the engine
    • F02D41/0215—Introducing corrections for particular conditions exterior to the engine in relation with elements of the transmission
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D2200/00—Input parameters for engine control
    • F02D2200/02—Input parameters for engine control the parameters being related to the engine
    • F02D2200/10—Parameters related to the engine output, e.g. engine torque or engine speed
    • F02D2200/1006—Engine torque losses, e.g. friction or pumping losses or losses caused by external loads of accessories
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D2200/00—Input parameters for engine control
    • F02D2200/02—Input parameters for engine control the parameters being related to the engine
    • F02D2200/10—Parameters related to the engine output, e.g. engine torque or engine speed
    • F02D2200/1012—Engine speed gradient
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D2250/00—Engine control related to specific problems or objectives
    • F02D2250/18—Control of the engine output torque
    • F02D2250/26—Control of the engine output torque by applying a torque limit
    • 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
    • F02D41/10—Introducing corrections for particular operating conditions for acceleration

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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 Vehicle Engines Or Engines For Specific Uses (AREA)
  • Combined Controls Of Internal Combustion Engines (AREA)

Abstract

The method involves allowing the dynamically adaptive maximum permissible engine torque limit value between the maximum possible engine torque and a maximum permissible drive train torque. The maximum permissible drive train torque is defined by the components of a drive train. The dynamically adaptive maximum permissible engine torque limit value is determined in the area depending on the instantaneous moment of inertia of the drive train.

Description

Die Erfindung bezieht sich auf ein Verfahren zur Reduzierung des Motormoments in einem Kraftfahrzeug.The invention relates to a method for reducing the engine torque in a motor vehicle.

Ein Verfahren zur Modifizierung des Motormoments ist beispielsweise aus der DE 42 09 091 C2 im Zusammenhang mit einer Komfortoptimierung bei Gangwechselvorgängen bekannt. Auch kann eine Reduzierung oder Erhöhung des Motormoments im Rahmen von Lastwechselvorgängen vorgenommen werden.A method for modifying the engine torque is for example from DE 42 09 091 C2 in connection with a comfort optimization in gear change operations known. Also, a reduction or increase in the engine torque can be made in the context of load changes.

Es ist Aufgabe der Erfindung, eine Reduzierung des Motormoments so gering wie möglich zu gestalten, ohne jedoch die Dauerfestigkeit der Bauteile des Antriebsstranges zu gefährden.It is an object of the invention to make a reduction in the engine torque as low as possible, but without endangering the fatigue strength of the components of the drive train.

Diese Aufgabe wird erfindungsgemäß durch den Gegenstand des Patentanspruchs 1 gelöst. Die abhängigen Patentansprüche sind vorteilhafte Weiterbildungen der Erfindung.This object is achieved by the subject of claim 1. The dependent claims are advantageous developments of the invention.

Das erfindungsgemäße Verfahren sieht eine Reduzierung des Motormoments in einem Kraftfahrzeug auf einen dynamisch adaptiven maximal zulässigen Motormomentgrenzwert unterhalb eines maximal möglichen Motormoments vor. Dabei ist der dynamisch adaptive maximal zulässige Motormomentgrenzwert zwischen dem maximal möglichen Motormoment und einem durch die Bauteile des Antriebsstrangs fest definierten maximal zulässigen Antriebsstrangmoment vorgebbar und wird in diesem Bereich zumindest in Abhängigkeit vom momentanen Trägheitsmoment des Antriebsstranges bestimmt.The method according to the invention provides for a reduction of the engine torque in a motor vehicle to a dynamically adaptive maximum permissible engine torque limit below a maximum possible engine torque. In this case, the dynamically adaptive maximum permissible engine torque limit value between the maximum possible engine torque and a maximum permissible drive train torque defined by the components of the drive train can be predetermined and is determined in this region at least as a function of the instantaneous moment of inertia of the drive train.

Der dynamisch adaptive maximal zulässige Motormomentgrenzwert wird vorzugsweise auch in Abhängigkeit vom Momentenbedarf der Nebenaggregate bestimmt.The dynamically adaptive maximum permissible engine torque limit value is preferably also determined as a function of the torque requirement of the auxiliary units.

Der Erfindung liegt folgende Erkenntnis zugrunde:
Üblicherweise wird das maximale am Getriebeeingang eines Handschalt- oder Automatikgetriebes anliegende Moment nicht durch die Leistungsfähigkeit des Motors (z. B. Brennkraftmaschine und/oder Elektromotor) begrenzt, sondern durch die nachgeschalteten Bauteile im Antriebsstrang (z. B. Getriebe, Kardanwelle, Hinterachsgetriebe oder Halbachsen) limitiert.The invention is based on the following finding:
Usually, the maximum torque applied to the transmission input of a manual or automatic transmission is not limited by the performance of the engine (eg internal combustion engine and / or electric motor), but by the downstream components in the drive train (eg transmission, cardan shaft, rear axle transmission or Half-axes) limited.

Daher wird zur Schonung der Bauteile des Antriebsstranges nach dem Stand der Technik durch die Motorsteuerung bei Bedarf eine Reduzierung des Motormoments auf ein fest definiertes maximal zulässiges Antriebsstrangmoment vorgegeben. Nachteilig daran ist, dass der Fahrer nicht das maximal mögliche Leistungspotenzial des Motors zur Verfügung hat und zwar auch dann nicht, wenn der Antriebsstrang gegebenenfalls aufgrund von dynamischen Vorgängen nicht bis zum maximal zulässigen Antriebsstrangmoment belastet wird.Therefore, in order to protect the components of the drive train according to the prior art by the engine control if required, a reduction of the engine torque to a fixedly defined maximum allowable drive train torque specified. The disadvantage of this is that the driver does not have the maximum possible performance potential of the engine available, even if the powertrain is possibly not loaded to the maximum permissible powertrain torque due to dynamic processes.

Die Erfindung sieht daher ein Verfahren zur „reduzierten Reduzierung” des Motormoments vor. Somit wird adaptiv eine dynamisch bedingte Momentenreserve ausgenutzt.The invention therefore provides a method of "reducing engine torque". Thus adaptively a dynamic conditional torque reserve is utilized.

In einem besonders vorteilhaften Ausführungsbeispiel der Erfindung wird der dynamisch adaptive maximal zulässige Motormomentgrenzwert M_grenz_motor durch folgende Formel bestimmt: Md_grenz_motor = Md_grenz_antrieb + Md_grenz_aggregate + Md_J Md_J = dn/dt × J In a particularly advantageous embodiment of the invention, the dynamically adaptive maximum permissible engine torque limit value M_grenz_motor is determined by the following formula: Md_grenz_motor = Md_grenz_antrieb + Md_grenz_aggregate + Md_J Md_J = dn / dt × J

Dabei ist Md_J ein aus dem Produkt der ersten Ableitung der Motordrehzahl n (oder Motordrehwinkelgeschwindigkeit ω) und dem momentanen Massenträgheitsmoment J gebildetes Drehenergiemoment.In this case, Md_J is a rotational energy generated from the product of the first derivative of the engine speed n (or engine rotational angular velocity ω) and the instantaneous mass moment of inertia J.

Zusätzlich wird vorzugsweise der dynamisch adaptive maximal zulässige Motormomentgrenzwert M_grenz_motor auch in Abhängigkeit vom Momentenbedarf Md_grenz_aggregate der Nebenaggregate bestimmt. Derartige Nebenaggregate sind beispielsweise der Generator, der Klimakompressor oder die Servolenkung.In addition, preferably the dynamically adaptive maximum permissible engine torque limit value M_grenz_motor is also determined as a function of the torque requirement Md_grenz_aggregate of the ancillary units. Such ancillaries are for example the generator, the air compressor or the power steering.

Das momentane (Massen-)Trägheitsmoment J wird vorzugsweise dynamisch abhängig vom momentan eingelegten Gang und/oder von der momentanen Motordrehzahl n und/oder von der jeweils aktuellen Einspritzmenge und/oder der Stellung der Kupplung bzw. der Wandlerkupplung bestimmt. Weiterhin wird das Trägheitsmoment J in üblicher Weise auch abhängig von den Gewichten der Bauteile des Antriebsstranges und deren Abständen zu den Drehachsen bestimmt.The instantaneous (mass) moment of inertia J is preferably determined dynamically depending on the gear currently engaged and / or on the instantaneous engine speed n and / or on the respectively current injection quantity and / or the position of the clutch or the converter clutch. Furthermore, the moment of inertia J is determined in a conventional manner also depending on the weights of the components of the drive train and their distances from the axes of rotation.

Besonders vorteilhaft ist eine möglichst schnelle Bestimmung des dynamisch adaptiven maximal zulässigen Motormoments, um Schwingungen durch die Steuerung zu vermeiden. Hierzu wird insbesondere auf eine schnelle Drehzahlermittlung zurückgegriffen, wie sie beispielsweise aus der DE 102 18 641 B4 bekannt ist. Über eine segmentsynchrone Drehzahl- und damit Momentberechnung ist es möglich, insbesondere bei Beschleunigungsvorgängen höhere Motormomente zuzulassen und trotzdem die Momentenlimitierung des Antriebsstranges einzuhalten. Dadurch kann dem Fahrer bei gleicher Antriebsstrangkonfigurierung eine höhere Fahrdynamik zur Verfügung gestellt werden.It is particularly advantageous to determine the dynamically adaptive maximum permissible engine torque as quickly as possible in order to avoid vibrations by the controller. For this purpose, in particular recourse to a fast speed determination, as for example from the DE 102 18 641 B4 is known. By means of a segment-synchronous speed and thus torque calculation, it is possible to allow higher engine torques, in particular during acceleration processes, and nevertheless to observe the torque limitation of the drive train. As a result, the driver with the same powertrain configuration, a higher driving dynamics can be provided.

Die Erfindung wird insbesondere durch ein entsprechendes neues Softwaremodul in einem ohnehin vorgesehenen elektronischen Motorsteuergerät auch gegebenenfalls durch darin abgespeicherte Kennfelder realisiert. The invention is also realized in particular by a corresponding new software module in an electronic engine control unit which is provided anyway, possibly by maps stored therein.

ZITATE ENTHALTEN IN DER BESCHREIBUNG QUOTES INCLUDE IN THE DESCRIPTION

Diese Liste der vom Anmelder aufgeführten Dokumente wurde automatisiert erzeugt und ist ausschließlich zur besseren Information des Lesers aufgenommen. Die Liste ist nicht Bestandteil der deutschen Patent- bzw. Gebrauchsmusteranmeldung. Das DPMA übernimmt keinerlei Haftung für etwaige Fehler oder Auslassungen.This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Zitierte PatentliteraturCited patent literature

  • DE 4209091 C2 [0002] DE 4209091 C2 [0002]
  • DE 10218641 B4 [0014] DE 10218641 B4 [0014]

Claims (3)

Verfahren zur Reduzierung des Motormoments in einem Kraftfahrzeug auf einen dynamisch adaptiven maximal zulässigen Motormomentgrenzwert (Md_grenz_motor) unterhalb eines maximal möglichen Motormoments (Md_max_motor), wobei der dynamisch adaptive maximal zulässige Motormomentgrenzwert (Md_grenz_motor) zwischen dem maximal möglichen Motormoment (M_max_motor) und einem durch die Bauteile des Antriebsstrangs fest definierten maximal zulässigen Antriebsstrangmoment (Md_grenz_antrieb) vorgebbar ist und in diesem Bereich zumindest in Abhängigkeit vom momentanen Trägheitsmoment (J) des Antriebsstranges bestimmt wird.Method for reducing the engine torque in a motor vehicle to a dynamically adaptive maximum permissible engine torque limit (Md_grenz_motor) below a maximum possible engine torque (Md_max_motor), wherein the dynamically adaptive maximum permissible engine torque limit (Md_grenz_motor) between the maximum possible engine torque (M_max_motor) and one through the components the powertrain firmly defined maximum allowable driveline torque (Md_grenz_antrieb) is predetermined and is determined in this area, at least in dependence on the momentary moment of inertia (J) of the drive train. Verfahren nach Patentanspruch 1, dadurch gekennzeichnet, dass der dynamisch adaptive maximal zulässige Motormomentgrenzwert (M_grenz_motor) auch in Abhängigkeit vom Momentenbedarf (Md_grenz_aggregate) der Nebenaggregate bestimmt wird.Method according to Patent Claim 1, characterized in that the dynamically adaptive maximum permissible engine torque limit value (M_grenz_motor) is also determined as a function of the torque requirement (Md_grenz_aggregate) of the ancillary components. Verfahren nach einem der vorangegangenen Patentansprüche, dadurch gekennzeichnet, dass der dynamisch adaptive maximal zulässige Motormomentgrenzwert (M_grenz_motor) durch die Formel Md_grenz_motor = Md_grenz_antrieb + Md_grenz_aggregate + Md_J bestimmt wird, wobei Md_J ein aus dem Produkt der ersten Ableitung der Motordrehzahl (n) und dem momentanen Massenträgheitsmoment (J) gebildetes Drehenergiemoment ist.Method according to one of the preceding claims, characterized in that the dynamically adaptive maximum permissible engine torque limit (M_grenz_motor) by the formula Md_grenz_motor = Md_grenz_antrieb + Md_grenz_aggregate + Md_J is determined, where Md_J is a rotational energy formed from the product of the first derivative of the engine speed (n) and the momentary moment of inertia (J).
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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102011075143A1 (en) * 2011-05-03 2012-11-08 Robert Bosch Gmbh Method for providing maximum drive torque to drive system for motor vehicle, involves determining maximum allowable drive torque based on set maximum torque and determined allowable relative drive torque
FR3027631A1 (en) * 2014-10-23 2016-04-29 Renault Sa METHOD OF MANAGING MOTOR TORQUE IN A VEHICLE
WO2017060403A1 (en) * 2015-10-07 2017-04-13 Audi Ag Drive device for an all-wheel-drive motor vehicle
FR3043046A1 (en) * 2015-11-03 2017-05-05 Peugeot Citroen Automobiles Sa METHOD OF CONTROLLING THE TORQUE OF AN ENGINE IN A MOTOR VEHICLE

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Publication number Priority date Publication date Assignee Title
DE4209091C2 (en) 1992-03-20 1996-04-18 Bayerische Motoren Werke Ag Method for reducing the engine torque when changing gear in a motor vehicle
DE4414129C2 (en) * 1994-04-22 2001-05-31 Hella Kg Hueck & Co Method for determining a maximum permissible drive torque of a motor vehicle engine for the precontrolling avoidance of unstable driving conditions when cornering
DE19961290A1 (en) * 1999-12-18 2001-06-21 Bosch Gmbh Robert Device for controlling combustion engine determines torque control value that defines permissible engine torque depending on coolant temperature and maximum coolant temperature
JP2006170116A (en) * 2004-12-17 2006-06-29 Nissan Motor Co Ltd Prime mover torque control device
DE10218641B4 (en) 2002-04-25 2006-11-30 Bayerische Motoren Werke Ag Engine speed determination
DE102007032996A1 (en) * 2006-08-12 2008-02-14 Luk Lamellen Und Kupplungsbau Beteiligungs Kg Restricting torque output from internal combustion engine of drive train involves deriving revolution rate from operating parameters of drive train, of which at least one is different from instantaneous measured engine revolution rate

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US5740044A (en) 1995-06-16 1998-04-14 Caterpillar Inc. Torque limiting power take off control and method of operating same
JP3931810B2 (en) 2002-12-27 2007-06-20 アイシン・エィ・ダブリュ株式会社 Vehicle control device

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4209091C2 (en) 1992-03-20 1996-04-18 Bayerische Motoren Werke Ag Method for reducing the engine torque when changing gear in a motor vehicle
DE4414129C2 (en) * 1994-04-22 2001-05-31 Hella Kg Hueck & Co Method for determining a maximum permissible drive torque of a motor vehicle engine for the precontrolling avoidance of unstable driving conditions when cornering
DE19961290A1 (en) * 1999-12-18 2001-06-21 Bosch Gmbh Robert Device for controlling combustion engine determines torque control value that defines permissible engine torque depending on coolant temperature and maximum coolant temperature
DE10218641B4 (en) 2002-04-25 2006-11-30 Bayerische Motoren Werke Ag Engine speed determination
JP2006170116A (en) * 2004-12-17 2006-06-29 Nissan Motor Co Ltd Prime mover torque control device
DE102007032996A1 (en) * 2006-08-12 2008-02-14 Luk Lamellen Und Kupplungsbau Beteiligungs Kg Restricting torque output from internal combustion engine of drive train involves deriving revolution rate from operating parameters of drive train, of which at least one is different from instantaneous measured engine revolution rate

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102011075143A1 (en) * 2011-05-03 2012-11-08 Robert Bosch Gmbh Method for providing maximum drive torque to drive system for motor vehicle, involves determining maximum allowable drive torque based on set maximum torque and determined allowable relative drive torque
DE102011075143B4 (en) * 2011-05-03 2014-05-22 Robert Bosch Gmbh Method and device for checking the plausibility and / or limiting a requested drive torque
FR3027631A1 (en) * 2014-10-23 2016-04-29 Renault Sa METHOD OF MANAGING MOTOR TORQUE IN A VEHICLE
WO2017060403A1 (en) * 2015-10-07 2017-04-13 Audi Ag Drive device for an all-wheel-drive motor vehicle
CN108136904A (en) * 2015-10-07 2018-06-08 奥迪股份公司 For the driving device of a11wheel drive motor vehicle
US10589745B2 (en) 2015-10-07 2020-03-17 Audi Ag Drive device for an all-wheel-drive motor vehicle
CN108136904B (en) * 2015-10-07 2020-12-08 奥迪股份公司 Drive device for all-wheel drive motor vehicle
FR3043046A1 (en) * 2015-11-03 2017-05-05 Peugeot Citroen Automobiles Sa METHOD OF CONTROLLING THE TORQUE OF AN ENGINE IN A MOTOR VEHICLE

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