EP2160524A1 - Method and device for controlling a coasting movement of a vehicle - Google Patents

Method and device for controlling a coasting movement of a vehicle

Info

Publication number
EP2160524A1
EP2160524A1 EP08760048A EP08760048A EP2160524A1 EP 2160524 A1 EP2160524 A1 EP 2160524A1 EP 08760048 A EP08760048 A EP 08760048A EP 08760048 A EP08760048 A EP 08760048A EP 2160524 A1 EP2160524 A1 EP 2160524A1
Authority
EP
European Patent Office
Prior art keywords
braking torque
clutch
combustion engine
internal combustion
vehicle
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Withdrawn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
EP08760048A
Other languages
German (de)
French (fr)
Inventor
Florian Schneider
Thomas JÄGER
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.)
ZF Friedrichshafen AG
Original Assignee
ZF Friedrichshafen AG
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 ZF Friedrichshafen AG filed Critical ZF Friedrichshafen AG
Publication of EP2160524A1 publication Critical patent/EP2160524A1/en
Withdrawn legal-status Critical Current

Links

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
    • B60W10/18—Conjoint control of vehicle sub-units of different type or different function including control of braking systems
    • 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
    • B60W30/18009—Propelling the vehicle related to particular drive situations
    • B60W30/18109—Braking
    • 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
    • B60W30/18009—Propelling the vehicle related to particular drive situations
    • B60W30/18072—Coasting
    • B60W2030/1809—Without torque flow between driveshaft and engine, e.g. with clutch disengaged or transmission in neutral
    • 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
    • F16D2500/30—Signal inputs
    • F16D2500/306—Signal inputs from the engine
    • F16D2500/3065—Torque of the engine
    • 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
    • F16D2500/30—Signal inputs
    • F16D2500/31—Signal inputs from the vehicle
    • F16D2500/3108—Vehicle speed
    • 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
    • F16D2500/50—Problem to be solved by the control system
    • F16D2500/504—Relating the engine
    • F16D2500/5048—Stall prevention
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect

Definitions

  • the present invention relates to an apparatus and a method for controlling a drive train according to the preamble of the independent claims.
  • a powertrain of a vehicle includes an engine, a transmission, a clutch disposed between the engine and the transmission, and at least one wheel.
  • a transmission control is additionally available.
  • a communication bus is also provided to allow communication of the powertrain components.
  • at least one brake is present, which may be a service brake as well as an additional brake of some kind.
  • an additional braking torque is added to the braking torque of the drive train downstream of the clutch as soon as the clutch is opened.
  • the braking torque of the drive train downstream of the clutch is composed, for example, of the drag torques of the transmission, an axle and / or one or more brakes.
  • the added additional braking torque corresponds to the braking torque of the internal combustion engine to the wheel of the drive train at the moment or immediately before the moment in which the engine is decoupled from the clutch downstream powertrain by opening the clutch.
  • a communication bus transmits the instantaneous torque of the engine to the transmission control several times per second.
  • the last determined torque before the opening of the clutch is converted by means of the transmission control to a braking torque, which causes the internal combustion engine to the wheel.
  • the calculated value is used to be able to add an exact additional braking torque to the drive train downstream of the clutch.
  • the additional braking torque is generated by a service brake and / or a hydrodynamic brake and / or a hydrostatic brake and / or a transmission brake.
  • the additional braking torque is withdrawn when the vehicle is at a standstill so that an immediate onward movement is then made possible. Furthermore, the additional braking torque after a predetermined time function, such as a ramp, gradually be withdrawn.
  • the driver has time to respond appropriately to the elimination of the braking torque of the engine.
  • the additional braking torque is withdrawn at the latest when an acceleration request of the driver is detected, for example by a torque request from the internal combustion engine.
  • the additional braking torque is added only when a stop request of the driver is detected. This also allows a slow roll out of the vehicle can be realized.
  • Fig. 1 is a highly schematic representation of a drive train
  • FIG. 1 is a highly schematic representation of a drive train 1, comprising a clutch 3 between an internal combustion engine 2 and a transmission 4.
  • the transmission 4 is connected to two drive wheels 5 and a service brake 6 is disposed at the wheels 5.
  • the drive train 1 has a transmission control 8 and a communication bus 7, wherein the communication bus 7 connects the components of the drive train 1 and enables communication between them.
  • step 1 the question arises whether the minimum speed of the vehicle is reached at which a stalling of the internal combustion engine 2 threatens. If the minimum speed is not reached, step 1 repeats itself. If the question of step 1 1 is answered in the affirmative, steps 12, 13, 14 and 15, which take place within a narrow period of time, are triggered. At or shortly before reaching the minimum speed opening of the clutch 3 takes place in step 14 to avoid stalling of the internal combustion engine 2.
  • step 12 Through the communication bus 6, the torque of the internal combustion engine 2 is imparted to the transmission control 8 several times per second and is shown in step 12.
  • the last mediated torque of the internal combustion engine 2 before opening the clutch 3 is used by the transmission controller 8 to calculate the braking torque with which the internal combustion engine 2 acts on the wheels 4, the calculation is shown in step 13.
  • the calculated additional braking torque is added by the service brake 6 to the drive train 1 in step 15 such that no difference in the rolling resistance of the vehicle is detected by the driver.
  • the additional braking torque is canceled again if one of the criteria is fulfilled: • Step 16, vehicle is stationary, • Step 17, an acceleration request of the driver is detected or
  • Step 18 a time function has expired.
  • a service brake is used to add the additional braking torque.
  • Other powertrain brakes are not excluded from the spirit of the invention, for example, a hydrodynamic brake or a hydrostatic brake or a combination of several different brakes may be used.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Transportation (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Automation & Control Theory (AREA)
  • Hydraulic Clutches, Magnetic Clutches, Fluid Clutches, And Fluid Joints (AREA)
  • Control Of Driving Devices And Active Controlling Of Vehicle (AREA)
  • Control Of Transmission Device (AREA)

Abstract

According to the invention, from the opening of the clutch (3), an additional braking torque is added to the braking torque of the drivetrain which is connected downstream of the clutch (3). The braking torque of the drivetrain which is connected downstream of the clutch (3) comprises for example the drag torques of the transmission (4), of an axle and/or of one or more brakes (6). The added additional braking torque corresponds to the braking torque of the internal combustion engine (2) on the wheel (5) of the drivetrain (1) at the moment or immediately before the moment in which the internal combustion engine (2) is decoupled, by the opening of the clutch (3), from the drivetrain which is connected downstream of the clutch (3). As a result of the addition of the additional braking torque to the drivetrain which is connected downstream of the clutch (3), the entire braking torque acting on the wheel (5) before the opening and also after the opening of the clutch (3) is kept constant. An increase in driving comfort of the vehicle is thereby obtained, as is an increase in safety since there is no abrupt change in the rolling resistance of the vehicle. The vehicle can therefore coast or stop in a smooth fashion.

Description

Verfahren und Vorrichtung zur Steuerung eines Ausrollens eines Fahrzeuges Method and device for controlling a rolling out of a vehicle
Die vorliegende Erfindung betrifft eine Vorrichtung und ein Verfahren zur Steuerung eines Antriebsstrangs nach dem Oberbegriff der unabhängigen Ansprüche.The present invention relates to an apparatus and a method for controlling a drive train according to the preamble of the independent claims.
In der DE 198 07 095 wird ein Verfahren zum gesteuerten Bremseingriff bei einer automatischen Schaltung eines Kraftfahrzeugs im Schubbetrieb bei starkem Gefälle vorgeschlagen, damit Überdrehzahlen des Motors beim Einschalten eines niedrigen Ganges nicht auftreten. Ein drohendes Abwürgen wegen zu geringen Drehzahlen des Verbrennungsmotors wird nicht behandelt.In DE 198 07 095 a method for controlled braking intervention in an automatic circuit of a motor vehicle in overrun at high gradient is proposed, so that overspeed of the engine when switching on a low gear does not occur. An impending stall due to low engine speeds is not treated.
Beim Anhalten und Ausrollen eines Fahrzeuges sinkt die Drehzahl des Verbrennungsmotors ab. Bei einer vorbestimmten Drehzahl des Verbrennungsmotors wird die Kupplung geöffnet, um ein Abwürgen bzw. Drücken des Verbrennungsmotors zu verhindern. Dadurch fällt das Bremsmoment des Verbrennungsmotors weg, was für den Fahrer durch einen veränderten Rollwiderstand des Fahrzeugs oder in dem Falle einer Gefällefahrt sogar eine Beschleunigung des Fahrzeugs deutlich gemacht wird. Eine Lösung des beschriebenen Problems ist im Stand der Technik nicht zu finden. Die manchmal abrupte Veränderung des Rollwiderstands ist sowohl aus Komfort- als auch Sicherheitsgründen nicht wünschenswert.When stopping and rolling out a vehicle, the speed of the internal combustion engine decreases. At a predetermined speed of the internal combustion engine, the clutch is opened to prevent stalling or pressing of the internal combustion engine. As a result, the braking torque of the internal combustion engine falls away, which is even made clear to the driver by an altered rolling resistance of the vehicle or in the case of a downhill even acceleration of the vehicle. A solution of the problem described can not be found in the prior art. The sometimes abrupt change in rolling resistance is undesirable for both comfort and safety reasons.
Daher ist es die Aufgabe der vorliegenden Erfindung, eine Vorrichtung und ein Verfahren zur Verhinderung einer abrupten Veränderung des Rollwiderstands beim Ausrollen und/oder Anhalten eines Fahrzeugs aufzuzeigen.Therefore, it is the object of the present invention to provide an apparatus and a method for preventing an abrupt change in the rolling resistance when rolling out and / or stopping a vehicle.
Diese Aufgabe wird durch ein Verfahren mit den Merkmalen gemäß Anspruch 1 sowie eine Vorrichtung mit den Merkmalen gemäß Anspruch 8 gelöst. Ein Antriebsstrang eines Fahrzeugs weist einen Verbrennungsmotor, ein Getriebe, eine zwischen dem Verbrennungsmotor und dem Getriebe angeordnete Kupplung und mindestens ein Rad auf. Im Fall eines automatisierten Getriebes ist zusätzlich eine Getriebesteuerung vorhanden. Ein Kommunikationsbus ist auch vorhanden, um eine Kommunikation der Komponenten des Antriebsstranges zu ermöglichen. Ferner ist mindestens eine Bremse vorhanden, welche eine Betriebsbremse sowohl als auch eine zusätzliche Bremse von irgendwelcher Art sein kann.This object is achieved by a method having the features according to claim 1 and a device having the features according to claim 8. A powertrain of a vehicle includes an engine, a transmission, a clutch disposed between the engine and the transmission, and at least one wheel. In the case of an automated transmission, a transmission control is additionally available. A communication bus is also provided to allow communication of the powertrain components. Further, at least one brake is present, which may be a service brake as well as an additional brake of some kind.
Erfindungsgemäß wird ab Öffnen der Kupplung ein zusätzliches Bremsmoment zu dem Bremsmoment des der Kupplung nachgeordneten Antriebsstrangs zugefügt. Das Bremsmoment des der Kupplung nachgeordneten Antriebsstrangs setzt sich beispielsweise zusammen aus der Schleppmomenten des Getriebes, einer Achse und/oder einer oder mehrerer Bremsen. Das zugefügte zusätzliche Bremsmoment entspricht dem Bremsmoment des Verbrennungsmotors auf das Rad des Antriebstranges in dem Augenblick oder unmittelbar vor dem Augenblick, in dem der Verbrennungsmotor vom der Kupplung nachgeordneten Antriebsstrang durch das Öffnen der Kupplung entkoppelt wird. Durch die Zufügung des zusätzlichen Bremsmoments zum der Kupplung nachgeordneten Antriebsstrang wird das gesamte auf den Rad wirkende Bremsmoment vor dem Öffnen sowohl als auch nach dem Öffnen der Kupplung gleich gehalten. Somit ist eine Erhöhung des Fahrkomforts des Fahrzeugs erreicht sowohl als auch eine Erhöhung der Sicherheit, da keine abrupte Veränderung des Rollwiderstands des Fahrzeugs entsteht. Somit kann das Fahrzeug auf eine ruhige Art und Weise ausrollen bzw. anhalten.According to the invention, an additional braking torque is added to the braking torque of the drive train downstream of the clutch as soon as the clutch is opened. The braking torque of the drive train downstream of the clutch is composed, for example, of the drag torques of the transmission, an axle and / or one or more brakes. The added additional braking torque corresponds to the braking torque of the internal combustion engine to the wheel of the drive train at the moment or immediately before the moment in which the engine is decoupled from the clutch downstream powertrain by opening the clutch. By the addition of the additional braking torque to the clutch downstream powertrain, the entire acting on the wheel braking torque is kept the same before opening both and after opening the clutch. Thus, an increase in the ride comfort of the vehicle is achieved as well as an increase in safety, since there is no abrupt change in the rolling resistance of the vehicle. Thus, the vehicle can roll out or stop in a quiet manner.
Ein Kommunikationsbus übermittelt das momentane Drehmoment des Verbrennungsmotors zu der Getriebesteuerung mehrmals pro Sekunde. Das zuletzt ermittelte Drehmoment vor der Öffnung der Kupplung wird mittels der Getriebesteuerung umgerechnet zu einem Bremsmoment, welches der Verbrennungsmotor auf das Rad bewirkt. Der berechnete Wert wird benutzt, um ein exaktes zusätzliches Bremsmoment dem der Kupplung nachgeordneten Antriebsstrang zufügen zu können.A communication bus transmits the instantaneous torque of the engine to the transmission control several times per second. The last determined torque before the opening of the clutch is converted by means of the transmission control to a braking torque, which causes the internal combustion engine to the wheel. The calculated value is used to be able to add an exact additional braking torque to the drive train downstream of the clutch.
Ferner wird das zusätzliche Bremsmoment von einer Betriebsbremse und/oder einer hydrodynamischen Bremse und/oder einer hydrostatischen Bremse und/oder einer Getriebebremse erzeugt.Furthermore, the additional braking torque is generated by a service brake and / or a hydrodynamic brake and / or a hydrostatic brake and / or a transmission brake.
In einer vorteilhaften Variante der Erfindung wird das zusätzliche Bremsmoment beim Stillstand des Fahrzeugs zurückgenommen, damit dann ein unmittelbares Weiterfahren ermöglich wird. Des Weiteren kann das zusätzliche Bremsmoment nach einer vorbestimmten zeitlichen Funktion, beispielsweise einer Rampe, nach und nach zurückgenommen werden. Hierbei hat der Fahrer Zeit, auf das Wegfallen des Bremsmoments des Verbrennungsmotors geeignet zu reagieren. Jedoch wird das zusätzliche Bremsmoment spätestens dann zurückgenommen, wenn ein Beschleunigungswunsch des Fahrers erkannt wird, beispielsweise durch eine Drehmomentanforderung vom Verbrennungsmotor.In an advantageous variant of the invention, the additional braking torque is withdrawn when the vehicle is at a standstill so that an immediate onward movement is then made possible. Furthermore, the additional braking torque after a predetermined time function, such as a ramp, gradually be withdrawn. Here, the driver has time to respond appropriately to the elimination of the braking torque of the engine. However, the additional braking torque is withdrawn at the latest when an acceleration request of the driver is detected, for example by a torque request from the internal combustion engine.
In einer weiteren Variante der Erfindung wird das zusätzliche Bremsmoment nur dann zugefügt, wenn ein Anhaltewunsch des Fahrers erkannt wird. Damit kann auch ein langsames Ausrollen des Fahrzeugs realisiert werden.In a further variant of the invention, the additional braking torque is added only when a stop request of the driver is detected. This also allows a slow roll out of the vehicle can be realized.
Weitere Vorteile und vorteilhafte Ausgestaltungen der Erfindung sind Gegenstand der nachfolgenden Figuren sowie deren Beschreibung. Es zeigen:Further advantages and advantageous embodiments of the invention are the subject of the following figures and their description. Show it:
Fig. 1 eine stark schematische Darstellung eines Antriebsstrangs undFig. 1 is a highly schematic representation of a drive train and
Fig. 2 ein Flussdiagramm des erfindungsgemäßen Verfahrens. In Fig. 1 ist eine stark schematische Darstellung eines Antriebsstrangs 1 dargestellt, aufweisend eine Kupplung 3 zwischen einem Verbrennungsmotor 2 und einem Getriebe 4. Das Getriebe 4 ist mit zwei Antriebsräder 5 verbunden und eine Betriebsbremse 6 ist bei den Rädern 5 angeordnet. Des Weiteren weist der Antriebsstrang 1 eine Getriebesteuerung 8 und einen Kommunikationsbus 7 auf, wobei der Kommunikationsbus 7 die Komponenten des Antriebsstrangs 1 verbindet und eine Kommunikation zwischen ihnen ermöglicht.2 shows a flow chart of the method according to the invention. In Fig. 1 is a highly schematic representation of a drive train 1, comprising a clutch 3 between an internal combustion engine 2 and a transmission 4. The transmission 4 is connected to two drive wheels 5 and a service brake 6 is disposed at the wheels 5. Furthermore, the drive train 1 has a transmission control 8 and a communication bus 7, wherein the communication bus 7 connects the components of the drive train 1 and enables communication between them.
In Fig. 2 wird der Ablauf des Verfahrens deutlich gemacht. Das Verfahren fängt mit einem Ausrollen des Fahrzeugs im Schritt 10 an. Irgendwann der niedrigste Gang des Getriebes 4 eingelegt und im Schritt 1 1 stellt sich die Frage, ob die Minimaldrehzahl des Fahrzeugs erreicht ist, bei welcher ein Abwürgen des Verbrennungsmotors 2 droht. Ist die Minimaldrehzahl nicht erreicht wiederholt sich der Schritt 1 1. Wird die Frage des Schritts 1 1 mit Ja beantwortet, löst sich die Schritte 12, 13, 14 und 15 aus, welche sich in einen engen Zeitraum abspielt. Bei oder kurz vor Erreichen der Minimaldrehzahl findet ein Öffnen der Kupplung 3 in den Schritt 14 statt, um ein Abwürgen des Verbrennungsmotors 2 zu vermieden. Durch den Kommunikationsbus 6 wird mehrmals pro Sekunde das Drehmoment des Verbrennungsmotors 2 zu der Getriebesteuerung 8 vermittelt und ist im Schritt 12 dargestellt. Das letzte vermittelte Drehmoment des Verbrennungsmotors 2 vor dem Öffnen der Kupplung 3 wird von der Getriebesteuerung 8 benutzt, um das Bremsmoment, mit welchem der Verbrennungsmotor 2 auf die Räder 4 wirkt zu berechnen, die Berechnung ist im Schritt 13 abgebildet.In Fig. 2, the flow of the process is made clear. The method begins with a coasting of the vehicle in step 10. At some point the lowest gear of the transmission 4 is inserted and in step 1 1, the question arises whether the minimum speed of the vehicle is reached at which a stalling of the internal combustion engine 2 threatens. If the minimum speed is not reached, step 1 repeats itself. If the question of step 1 1 is answered in the affirmative, steps 12, 13, 14 and 15, which take place within a narrow period of time, are triggered. At or shortly before reaching the minimum speed opening of the clutch 3 takes place in step 14 to avoid stalling of the internal combustion engine 2. Through the communication bus 6, the torque of the internal combustion engine 2 is imparted to the transmission control 8 several times per second and is shown in step 12. The last mediated torque of the internal combustion engine 2 before opening the clutch 3 is used by the transmission controller 8 to calculate the braking torque with which the internal combustion engine 2 acts on the wheels 4, the calculation is shown in step 13.
Gleichzeitig mit dem Schritt 14, Öffnen der Kupplung 3 wird in Schritt 15 das berechnete zusätzliche Bremsmoment durch die Betriebsbremse 6 zu dem Antriebsstrang 1 derart zugefügt, dass kein Unterschied im Rollwiderstand des Fahrzeugs vom Fahrer erkannt wird. Das zusätzliche Bremsmoment wird wieder zurückgenommen, wenn eines von den Kriterien erfüllt ist: • Schritt 16, Fahrzeug steht still, • Schritt 17, ein Beschleunigungswunsch des Fahrers ist erkannt oderSimultaneously with the step 14, opening of the clutch 3, the calculated additional braking torque is added by the service brake 6 to the drive train 1 in step 15 such that no difference in the rolling resistance of the vehicle is detected by the driver. The additional braking torque is canceled again if one of the criteria is fulfilled: • Step 16, vehicle is stationary, • Step 17, an acceleration request of the driver is detected or
• Schritt 18, eine zeitliche Funktion ist abgelaufen.• Step 18, a time function has expired.
Wobei durch die zeitliche Funktion das zusätzliche Bremsmoment schrittweise zurückgenommen wird.Whereby the temporal function reduces the additional braking torque step by step.
In Fig. 1 und 2 wird eine Betriebsbremse benutzt, um das zusätzliche Bremsmoment zuzufügen. Andere Bremsen im Antriebsstrang sind von dem Sinn der Erfindung nicht ausgenommen, beispielsweise kann eine hydrodynamische Bremse oder eine hydrostatischen Bremse oder eine Kombination von mehreren unterschiedlichen Bremsen benutzt werden. In Fig. 1 and 2, a service brake is used to add the additional braking torque. Other powertrain brakes are not excluded from the spirit of the invention, for example, a hydrodynamic brake or a hydrostatic brake or a combination of several different brakes may be used.
BezuqszeichenREFERENCE CHARACTERS
1 Antriebsstrang1 powertrain
2 Verbrennungsmotor2 internal combustion engine
3 Kupplung3 clutch
4 Getriebe4 gears
5 Antriebsräder5 drive wheels
6 Betriebsbremse6 service brake
7 Kommunikationsbus7 communication bus
8 Getriebesteuerung8 transmission control
10 Ausrollen10 roll out
1 1 Minimaldrehzahl des Verbrennungsmotors1 1 Minimum speed of the internal combustion engine
12 Einlesen des Drehmoments des Verbrennungsmotors12 Reading the torque of the internal combustion engine
13 Berechnung des zusätzlichen Bremsmoments13 Calculation of the additional braking torque
14 Öffnen der Kupplung14 Opening the clutch
15 Zufügung des zusätzlichen Bremsmoment15 Addition of the additional braking torque
16 Stillstand16 standstill
17 Beschleunigungswunsch17 acceleration request
18 Zeitliche Funktion abgelaufen18 Temporal function expired
19 Zurücknehmen des zusätzlichen Bremsmoment19 Withdrawal of additional braking torque
NeinNo
V Ja Yes

Claims

Patentansprüche claims
1. Verfahren zur Steuerung eines Antriebsstrangs (1) insbesondere für ein Fahrzeug, wobei der Antriebstrang (1) zumindest einen Verbrennungsmotor (2), ein Getriebe (4) und eine Kupplung (3) und mindestens ein Rad (5) aufweist, und die Kupplung (3) zwischen dem Getriebe (4) und dem Verbrennungsmotor (2) angeordnet ist und beim Ausrollen (19) des Fahrzeugs die Kupplung (3) bei Erreichen einer Minimaldrehzahl (11) des Verbrennungsmotors (2) die Kupplung (3) geöffnet wird, dadurch gekennzeichnet, dass ab Öffnen (14) der Kupplung (3) ein zusätzliches Bremsmoment zu dem Bremsmoment des der Kupplung (3) nachgeordneten Antriebsstrangs zugefügt wird (15), wobei das zusätzliche Bremsmoment dem Bremsmoment des Verbrennungsmotors (2) auf das Rad (5) des Antriebsstrangs (1) entspricht in einem Augenblick oder unmittelbar vor dem Augenblick, in dem Verbren- nugnsmotor (2) vom der Kupplung (3) nachgeordneten Antriebsstrang durch das Öffnen (14) der Kupplung (3) entkoppelt wird.1. A method for controlling a drive train (1) in particular for a vehicle, wherein the drive train (1) at least one internal combustion engine (2), a transmission (4) and a clutch (3) and at least one wheel (5), and Coupling (3) between the transmission (4) and the internal combustion engine (2) is arranged and when rolling out (19) of the vehicle, the clutch (3) upon reaching a minimum speed (11) of the internal combustion engine (2) the clutch (3) is opened , characterized in that from opening (14) of the clutch (3) an additional braking torque to the braking torque of the clutch (3) downstream drive train is added (15), wherein the additional braking torque to the braking torque of the internal combustion engine (2) on the wheel ( 5) of the drive train (1) corresponds to a moment or immediately before the moment in which combustion engine (2) from the clutch (3) downstream drive train by decoupling (14) of the clutch (3) is decoupled.
2. Verfahren nach Anspruch 1 , dadurch gekennzeichnet, dass bei dem Öffnen (14) oder unmittelbar vor dem Öffnen (14) der Kupplung (3) das Bremsmoment des Verbrennungsmotors (2) durch einen Kommunikationsbus (7) des Antriebsstrangs (1) zu einer Getriebesteuerung (8) übermittelt wird und die Wirkung des Bremsmoments auf das Rad (5) mittels der Getriebesteuerung (8) berechnet wird (13).2. The method according to claim 1, characterized in that at the opening (14) or immediately before the opening (14) of the clutch (3) the braking torque of the internal combustion engine (2) by a communication bus (7) of the drive train (1) to a Transmission control (8) is transmitted and the effect of the braking torque on the wheel (5) by means of the transmission control (8) is calculated (13).
3. Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet , dass das zusätzliche Bremsmoment von einer Betriebsbremse (6) und/oder einer hydrodynamische Bremse und/oder einer hydrostatische Bremse und/oder eine Getriebebremse erzeugt wird. 3. The method according to claim 1 or 2, characterized in that the additional braking torque of a service brake (6) and / or a hydrodynamic brake and / or a hydrostatic brake and / or a transmission brake is generated.
4. Verfahren nach Anspruch 1 , 2 oder 3, dadurch gekennzeichn e t , dass bei einem Stillstand (16) des Fahrzeugs das zusätzliche Bremsmoment zurückgenommen wird.4. The method of claim 1, 2 or 3, characterized e t that at a standstill (16) of the vehicle, the additional braking torque is withdrawn.
5. Verfahren nach einem der vorhergehenden Ansprüche, dadurch g e kennzeichnet, dass das zusätzliche Bremsmoment bei einem Beschleunigungswunsch (17) des Fahrers zurückgenommen wird.5. The method according to any one of the preceding claims, characterized g e indicates that the additional braking torque is withdrawn at an acceleration request (17) of the driver.
6. Verfahren nach einem der vorhergehenden Ansprüche, dadurch g e kennzeichnet, dass das zusätzliche Bremsmoment mittels einer zeitlichen Funktion (18) zurückgenommen wird.6. The method according to any one of the preceding claims, characterized g e indicates that the additional braking torque by means of a temporal function (18) is withdrawn.
7. Verfahren nach einem der vorhergehenden Ansprüche, dadurch g e kennzeichnet, dass das zusätzliche Bremsmoment nur dann zugefügt wird, wenn ein Anhaltewunsch des Fahrers erkannt wird.7. The method according to any one of the preceding claims, characterized g e indicates that the additional braking torque is added only when a stop request of the driver is detected.
8. Vorrichtung zur Steuerung eines Antriebsstrangs (1) insbesondere für ein Fahrzeug, aufweisend zumindest einen Verbrennungsmotor (2), ein Getriebe (4) und eine Kupplung (3) und mindestens ein Rad (5), wobei die Kupplung (3) zwischen dem Verbrennungsmotor (2) und dem Getriebe (4) angeordnet ist, dadurch gekennzeichnet, dass ein Mittel (6) zum Aufbringen eines zusätzlichen Bremsmoments auf dem der Kupplung (3) nachgeordneten Antriebsstrang vorgesehen ist und das zusätzliche Bremsmoment dem Bremsmoment des Verbrennungsmotors (2) auf das Rad (5) des Antriebsstranges (1) vorder Kupplungsöffnung (14) entspricht.8. A device for controlling a drive train (1) in particular for a vehicle, comprising at least one internal combustion engine (2), a transmission (4) and a clutch (3) and at least one wheel (5), wherein the coupling (3) between the Internal combustion engine (2) and the transmission (4) is arranged, characterized in that a means (6) for applying an additional braking torque on the clutch (3) downstream drive train is provided and the additional braking torque to the braking torque of the internal combustion engine (2) the wheel (5) of the drive train (1) before the coupling opening (14) corresponds.
9. Vorrichtung nach Anspruch 8, dadurch gekennzeichnet, dass das Mittel zum Aufbringen des zusätzlichen Bremsmoment aus einer Betriebsbremse (6) und/oder einer hydrodynamischen Bremse und/oder einer hydrostatischen Bremse und/oder einer Getriebebremse besteht. 9. The device according to claim 8, characterized in that the means for applying the additional braking torque from a service brake (6) and / or a hydrodynamic brake and / or a hydrostatic brake and / or a transmission brake.
EP08760048A 2007-06-30 2008-05-27 Method and device for controlling a coasting movement of a vehicle Withdrawn EP2160524A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102007030489A DE102007030489A1 (en) 2007-06-30 2007-06-30 Method and device for controlling a rolling out of a vehicle
PCT/EP2008/056450 WO2009003769A1 (en) 2007-06-30 2008-05-27 Method and device for controlling a coasting movement of a vehicle

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EP2160524A1 true EP2160524A1 (en) 2010-03-10

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EP08760048A Withdrawn EP2160524A1 (en) 2007-06-30 2008-05-27 Method and device for controlling a coasting movement of a vehicle

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EP (1) EP2160524A1 (en)
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WO (1) WO2009003769A1 (en)

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DE102007030489A1 (en) 2009-01-02
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