WO2008052872A1 - Controlling and/or regulating a starting process - Google Patents

Controlling and/or regulating a starting process Download PDF

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Publication number
WO2008052872A1
WO2008052872A1 PCT/EP2007/060887 EP2007060887W WO2008052872A1 WO 2008052872 A1 WO2008052872 A1 WO 2008052872A1 EP 2007060887 W EP2007060887 W EP 2007060887W WO 2008052872 A1 WO2008052872 A1 WO 2008052872A1
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WO
WIPO (PCT)
Prior art keywords
vehicle
engine
engine speed
air pressure
torque
Prior art date
Application number
PCT/EP2007/060887
Other languages
German (de)
French (fr)
Inventor
Oliver Buchhold
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.)
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Publication date
Application filed by Zf Friedrichshafen Ag filed Critical Zf Friedrichshafen Ag
Publication of WO2008052872A1 publication Critical patent/WO2008052872A1/en

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Classifications

    • 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
    • B60W30/18027—Drive off, accelerating from standstill
    • 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
    • B60W10/06—Conjoint control of vehicle sub-units of different type or different function including control of propulsion units including control of combustion engines
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D31/00—Use of speed-sensing governors to control combustion engines, not otherwise provided for
    • F02D31/001—Electric control of rotation speed
    • 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
    • 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
    • B60W2510/10—Change speed gearings
    • B60W2510/1015—Input shaft speed, e.g. turbine 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
    • B60W2540/00—Input parameters relating to occupants
    • B60W2540/10—Accelerator pedal 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
    • B60W2555/00—Input parameters relating to exterior conditions, not covered by groups B60W2552/00, B60W2554/00
    • B60W2555/20—Ambient conditions, e.g. wind or rain
    • 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
    • B60W2555/00—Input parameters relating to exterior conditions, not covered by groups B60W2552/00, B60W2554/00
    • B60W2555/40—Altitude
    • 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
    • B60W2710/02—Clutches
    • B60W2710/021—Clutch engagement state
    • B60W2710/022—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
    • B60W2710/00—Output or target parameters relating to a particular sub-units
    • B60W2710/06—Combustion engines, Gas turbines
    • B60W2710/0644—Engine speed
    • 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
    • F02D2200/1002—Output torque
    • F02D2200/1004—Estimation of the output torque
    • 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
    • F02D2200/70—Input parameters for engine control said parameters being related to the vehicle exterior
    • F02D2200/703—Atmospheric pressure

Definitions

  • the present invention relates to a method and a system for controlling and / or regulating a starting process in an automated transmission of a vehicle according to the closer defined in the preamble of claim 1 and 7, respectively.
  • a system for controlling switching operations in an automatic transmission of a motor vehicle is known.
  • the gearbox realizes four forward gears and one reverse gear.
  • the known system comprises a motor, an electronic computer and a computer access to an electronic memory.
  • a reference speed signal can be determined under defined operating conditions, in which a switching operation can be carried out according to plan at a reference air pressure.
  • the system includes means for calculating a correction of the reference speed and the air pressure to compensate for a difference between a reference air pressure and a current ambient air pressure so that a height corrected reference speed signal can be generated on the change in the air pressure.
  • the known system refers to normal automatic transmission planetary gearboxes to realize various translations. Furthermore, the correction in the known system refers exclusively to switching operations in this automatic transmission.
  • an automated transmission is known from automotive engineering, which is a common manual transmission, in which the switching operations are automated.
  • the switching operations and also the start by the transmission control carried out in conjunction with the engine control.
  • the transmission control When starting the engine speed control can be done via the transmission control in the automated transmission, the transmission control sends corresponding signals via the vehicle network to the engine control.
  • the transmission controller may maintain the engine speed at a desired value, in parallel with the clutch being controlled to adjust a clutch position that introduces a driver desired torque into the driveline.
  • the setpoint engine speed typically depends on the accelerator pedal position, because the engine delivers its maximum torque only at higher speed.
  • the present invention has for its object to propose a method and a system of the type described above, in which a stalling of the engine of the vehicle is prevented.
  • the target value of the engine speed is increased accordingly with decreasing air pressure in the vicinity of the vehicle. Consequently, at low air pressure, a higher target speed of the engine of the vehicle can be specified, which reliably prevents stalling of the engine.
  • the maximum coupling torque to be initiated is correspondingly limited. In this way, it is reliably prevented that the transmission control sets a desired engine torque, which the internal combustion engine can not muster. In this context, it may be advantageous if the maximum available engine torque of the internal combustion engine of the vehicle is used as the limit value for the clutch torque to be initiated. Other restrictions are also possible which realize optimum control of the starting process with the method according to the invention.
  • a further refinement in the method according to the invention can provide that the respective air pressure of the surroundings of the vehicle and the maximum engine torque via a vehicle network (CAN) are available, and can be accessed via this. In this way, these and other variables can be retrieved and evaluated at any time by the transmission control, in order then to be used accordingly to control the starting process.
  • CAN vehicle network
  • a possible embodiment of the method may provide that the air pressure-dependent setpoint value of the engine speed via the vehicle network CAN is specified by the transmission control, and that the actual engine speed is monitored by the transmission control in order to realize an optimal starting process.
  • the used setpoint curve of the engine speed is adapted to a specific air pressure of the environment of the vehicle.
  • the object underlying the invention is also achieved by a system for controlling and / or regulating a starting process in an automated transmission of a vehicle, which is equipped at least with a transmission control and a motor control, which are connected to each other data technically via a vehicle network.
  • the transmission control is coupled to the vehicle network (CAN) such that the target value of the engine speed when starting in dependence on the air pressure of the environment of the vehicle is adjustable.
  • the transmission control via the vehicle network to access a storage medium or the like, in which the air pressure-dependent setpoint curves of the engine speed are stored as characteristics.
  • a storage medium or the like in which the air pressure-dependent setpoint curves of the engine speed are stored as characteristics.
  • the proposed system is provided for carrying out the method also proposed. It is also possible that the proposed method and / or the system in other transmissions and other operating conditions may be used, with certain modifications may be necessary.
  • the sole FIGURE of the invention shows a diagram in which a plurality of nominal value curves of the engine speed n_Eng at different air pressures p_air over time during a starting process are shown. Furthermore, a course of a transmission input speed njn is also shown during the starting process.
  • the setpoint value of the engine speed nJ ⁇ ng is raised to an applicable value, which depends on the accelerator pedal position. Parallel to the torque build-up on the clutch, the transmission input speed n_ln is observed. As soon as the transmission control determines that the speed difference between the transmission input speed n_ln and the engine speed setpoint nJEng falls below a threshold value, the engine speed nJ ⁇ ng set point is tangentially applied to the transmission input speed n_ln.
  • various desired value curves of the engine speed nJ ⁇ ng are stored as characteristic curves which are assigned to the various air pressures p_air of the surroundings of the vehicle.
  • the target value of the engine speed n_Eng can be correspondingly increased with decreasing air pressures pJAir, so that with the method according to the invention an adaptation to the lower performance of the internal combustion engine is realized with decreasing air pressure p_air becomes. This minimizes the risk of stalling the engine when the vehicle is at high altitude.
  • the arrow shown in the figure indicates the direction in which the air pressure pj_uft rises in the values of the engine speed nJEng. As a result, the values of the setpoint curves increase with falling air pressure p_air.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Transportation (AREA)
  • General Engineering & Computer Science (AREA)
  • Automation & Control Theory (AREA)
  • Control Of Transmission Device (AREA)
  • Control Of Vehicle Engines Or Engines For Specific Uses (AREA)

Abstract

The invention relates to a method and a system for controlling and/or regulating a starting process in an automatic gearbox of a vehicle. A nominal value of the engine speed is predetermined for the starting process. The clutch moment is set by a predetermined clutch position. According to the invention, the nominal value of the engine speed (n_Eng) during starting is predetermined depending on the air pressure (p_Luft) of the surroundings of the vehicle.

Description

Steuern und/oder Regeln eines Anfahrvorganges Control and / or regulation of a start-up process
Die vorliegende Erfindung betrifft ein Verfahren und ein System zum Steuern und/oder Regeln eines Anfahrvorganges bei einem automatisierten Getriebe eines Fahrzeuges gemäß der im Oberbegriff des Patentanspruches 1 bzw. 7 näher definierten Art.The present invention relates to a method and a system for controlling and / or regulating a starting process in an automated transmission of a vehicle according to the closer defined in the preamble of claim 1 and 7, respectively.
Beispielsweise aus der Druckschrift EP 0 366 283 B1 ist ein System zur Steuerung von Schaltvorgängen in einem Automatikgetriebe eines Kraftfahrzeugs bekannt. Das Getriebe realisiert vier Vorwärtsgänge und einen Rückwärtsgang. Das bekannte System umfasst einen Motor, einen elektronischen Rechner und einen Rechnerzugriff auf einen elektronischen Speicher. Mit dem System kann ein Referenz-Geschwindigkeitssignal unter definierten Betriebsbedingungen ermittelt werden, bei dem ein Schaltvorgang planmäßig bei einem Referenzluftdruck vorgenommen werden kann.For example, from document EP 0 366 283 B1 a system for controlling switching operations in an automatic transmission of a motor vehicle is known. The gearbox realizes four forward gears and one reverse gear. The known system comprises a motor, an electronic computer and a computer access to an electronic memory. With the system, a reference speed signal can be determined under defined operating conditions, in which a switching operation can be carried out according to plan at a reference air pressure.
Ferner umfasst das System Mittel zum Berechnen einer Korrektur der Referenzgeschwindigkeit und des Luftdruck zum Ausgleich eines Unterschieds zwischen einem Referenz-Luftdruck und einem gegenwärtigen Umgebungs- Luftdruck, so dass auf die Veränderung des Luftdrucks ein höhenkorrigiertes Referenz-Geschwindigkeitssignal erzeugt werden kann.Further, the system includes means for calculating a correction of the reference speed and the air pressure to compensate for a difference between a reference air pressure and a current ambient air pressure so that a height corrected reference speed signal can be generated on the change in the air pressure.
Das bekannte System bezieht sich jedoch auf normale Automatikgetriebe mit Planeten radgetrieben zur Realisierung verschiedener Übersetzungen. Des Weiteren bezieht sich die Korrektur bei dem bekannten System ausschließlich auf Schaltvorgänge bei diesem Automatikgetriebe.However, the known system refers to normal automatic transmission planetary gearboxes to realize various translations. Furthermore, the correction in the known system refers exclusively to switching operations in this automatic transmission.
Darüber hinaus ist aus der Fahrzeugtechnik auch ein automatisiertes Getriebe bekannt, welches ein übliches Handschaltgetriebe ist, bei dem die Schaltvorgänge automatisiert sind. Bei diesem automatisierten Getriebe wer- den die Schaltvorgänge und auch das Anfahren durch die Getriebesteuerung in Verbindung mit der Motorsteuerung durchgeführt.In addition, an automated transmission is known from automotive engineering, which is a common manual transmission, in which the switching operations are automated. In this automated transmission the switching operations and also the start by the transmission control carried out in conjunction with the engine control.
Beim Anfahrvorgang kann bei dem automatisierten Getriebe die Motordrehzahlregelung über die Getriebesteuerung erfolgen, wobei die Getriebesteuerung entsprechende Signale über das Fahrzeugnetzwerk an die Motorsteuerung sendet. Die Getriebesteuerung kann die Motordrehzahl auf einem Sollwert halten, wobei parallel dazu die Kupplung derart angesteuert wird, dass eine Kupplungsposition eingestellt wird, die ein vom Fahrer gewünschtes Moment in den Antriebsstrang einleitet. Der Sollwert der Motordrehzahl hängt dabei typischerweise von der Fahrpedalstellung ab, weil der Verbrennungsmotor erst bei höherer Drehzahl sein maximales Moment liefert.When starting the engine speed control can be done via the transmission control in the automated transmission, the transmission control sends corresponding signals via the vehicle network to the engine control. The transmission controller may maintain the engine speed at a desired value, in parallel with the clutch being controlled to adjust a clutch position that introduces a driver desired torque into the driveline. The setpoint engine speed typically depends on the accelerator pedal position, because the engine delivers its maximum torque only at higher speed.
Es hat sich gezeigt, dass bei den bekannten automatisierten Getrieben bei der Durchführung des Anfahrvorganges Probleme auftreten können, wenn sich das Fahrzeug in größeren Höhen befindet. Dies deshalb, weil in größeren Höhen aufgrund des geringeren Luftdruckes relativ gesehen weniger Sauerstoff zur Verbrennung des Kraftstoffes zur Verfügung steht, so dass der Verbrennungsmotor nicht sein volles Motormoment liefern kann. In diesem Fall kann es beim Anfahrvorgang, insbesondere bei einem voll beladenen Fahrzeug, zum Abwürgen des Verbrennungsmotors kommen, da in dieser Situation das eingeleitete Kupplungsmoment das maximale Motormoment überschreitet.It has been found that in the known automated transmissions in carrying out the start-up problems may occur when the vehicle is at higher altitudes. This is because at relatively high altitudes, due to the lower air pressure, relatively less oxygen is available to burn the fuel so that the engine can not deliver its full engine torque. In this case, it may come to the stalling of the engine during the starting process, especially in a fully laden vehicle, since in this situation, the introduced clutch torque exceeds the maximum engine torque.
Demnach liegt der vorliegenden Erfindung die Aufgabe zugrunde, ein Verfahren und ein System der eingangs beschriebenen Gattung vorzuschlagen, bei dem ein Abwürgen des Motors des Fahrzeuges verhindert wird.Accordingly, the present invention has for its object to propose a method and a system of the type described above, in which a stalling of the engine of the vehicle is prevented.
Diese Aufgabe wird durch die Merkmale des Patentanspruchs 1 bzw. 7 gelöst. Weitere vorteilhafte Ausgestaltungen ergeben sich insbesondere aus den Unteransprüchen. Es wird somit ein Verfahren und ein System zum Steuern und/oder Regeln eines Anfahrvorganges bei einem automatisierten Getriebe vorgeschlagen, bei denen verschiedene Sollwertverläufe der Motordrehzahl für den Anfahrvorgang in Abhängigkeit des Luftdrucks der Umgebung des Fahrzeugs gewählt bzw. vorgegeben werden. Auf diese Weise wird die Anfahrdrehzahl in Abhängigkeit des Luftdrucks der Umgebung des Fahrzeugs vorgegeben. Durch diese bewusst gewählte Abhängigkeit kann eine optimale Durchführung des Anfahrvorganges mit dem automatisierten Getriebe ermöglicht werden, unabhängig davon, in welcher Höhe sich das Fahrzeug befindet.This object is solved by the features of patent claims 1 and 7, respectively. Further advantageous embodiments emerge in particular from the dependent claims. Thus, a method and a system for controlling and / or regulating a starting process in an automated transmission are proposed, in which different desired value curves of the engine speed for the starting process are selected or predetermined as a function of the air pressure of the surroundings of the vehicle. In this way, the starting speed is specified as a function of the air pressure of the environment of the vehicle. Through this deliberately chosen dependency, an optimal implementation of the starting process with the automated transmission can be made possible, regardless of the height at which the vehicle is located.
Im Rahmen einer bevorzugten Ausführung der vorliegenden Erfindung kann vorgesehen sein, dass der Sollwert der Motordrehzahl bei fallendem Luftdruck im Bereich der Umgebung des Fahrzeuges entsprechend erhöht wird. Folglich kann bei geringem Luftdruck eine höhere Solldrehzahl des Verbrennungsmotors des Fahrzeugs vorgegeben werden, welches sicher ein Abwürgen des Motors verhindert.In a preferred embodiment of the present invention can be provided that the target value of the engine speed is increased accordingly with decreasing air pressure in the vicinity of the vehicle. Consequently, at low air pressure, a higher target speed of the engine of the vehicle can be specified, which reliably prevents stalling of the engine.
Um den Anfahrvorgang bei dem Fahrzeug weiter zu optimieren, kann gemäß einer nächsten Weiterbildung der vorliegenden Erfindung vorgesehen sein, dass das maximal einzuleitende Kupplungsmoment entsprechend begrenzt wird. Auf diese Weise wird sicher verhindert, dass die Getriebesteuerung ein Motorsollmoment vorgibt, welches der Verbrennungsmotor nicht aufbringen kann. In diesem Zusammenhang kann es von Vorteil sein, wenn als Grenzwert das maximal verfügbare Motormoment des Verbrennungsmotors des Fahrzeugs für das einzuleitende Kupplungsmoment verwendet wird. Es sind auch andere Beschränkungen möglich, die eine optimale Steuerung des Anfahrvorgangs mit dem erfindungsgemäßen Verfahren realisieren.In order to further optimize the starting process in the vehicle, it can be provided according to a next development of the present invention that the maximum coupling torque to be initiated is correspondingly limited. In this way, it is reliably prevented that the transmission control sets a desired engine torque, which the internal combustion engine can not muster. In this context, it may be advantageous if the maximum available engine torque of the internal combustion engine of the vehicle is used as the limit value for the clutch torque to be initiated. Other restrictions are also possible which realize optimum control of the starting process with the method according to the invention.
Eine weitere Ausgestaltung bei dem erfindungsgemäßen Verfahren kann vorsehen, dass der jeweilige Luftdruck der Umgebung des Fahrzeugs und das maximal Motormoment über ein Fahrzeugnetzwerk (CAN) verfügbar sind und über dieses abgerufen werden können. Auf diese Weise können diese und andere Größen jederzeit von der Getriebesteuerung abgerufen und ausgewertet werden, um dann zur Ansteuerung des Anfahrvorganges entsprechend eingesetzt zu werden.A further refinement in the method according to the invention can provide that the respective air pressure of the surroundings of the vehicle and the maximum engine torque via a vehicle network (CAN) are available, and can be accessed via this. In this way, these and other variables can be retrieved and evaluated at any time by the transmission control, in order then to be used accordingly to control the starting process.
Eine mögliche Ausführung des Verfahrens kann vorsehen, dass der luftdruckabhängige Sollwert der Motordrehzahl über das Fahrzeugnetzwerk CAN durch die Getriebesteuerung vorgegeben wird, und dass auch die tatsächliche Motordrehzahl durch die Getriebesteuerung beobachtet wird, um einen optimalen Anfahrvorgang zu realisieren. Dadurch wird der verwendete Sollwertverlauf der Motordrehzahl an einen bestimmten Luftdruck der Umgebung des Fahrzeugs angepasst.A possible embodiment of the method may provide that the air pressure-dependent setpoint value of the engine speed via the vehicle network CAN is specified by the transmission control, and that the actual engine speed is monitored by the transmission control in order to realize an optimal starting process. As a result, the used setpoint curve of the engine speed is adapted to a specific air pressure of the environment of the vehicle.
Die der Erfindung zugrunde liegende Aufgabe wird auch durch ein System zum Steuern und/oder Regeln eines Anfahrvorganges bei einem automatisierten Getriebe eines Fahrzeuges gelöst, welches zumindest mit einer Getriebesteuerung und einer Motorsteuerung ausgerüstet ist, die über ein Fahrzeugnetzwerk datentechnisch miteinander verbunden sind. Erfindungsgemäß wird die Getriebesteuerung derart mit dem Fahrzeugnetzwerk (CAN) gekoppelt, dass der Sollwert der Motordrehzahl beim Anfahren in Abhängigkeit des Luftdruckes der Umgebung des Fahrzeuges einstellbar ist.The object underlying the invention is also achieved by a system for controlling and / or regulating a starting process in an automated transmission of a vehicle, which is equipped at least with a transmission control and a motor control, which are connected to each other data technically via a vehicle network. According to the transmission control is coupled to the vehicle network (CAN) such that the target value of the engine speed when starting in dependence on the air pressure of the environment of the vehicle is adjustable.
Beispielsweise kann vorgesehen sein, dass die Getriebesteuerung über das Fahrzeugnetzwerk auf ein Speichermedium oder dergleichen zugreifen kann, in dem die luftdruckabhängigen Sollwertverläufe der Motordrehzahl als Kennlinien hinterlegt sind. Auf diese Weise ist mit dem erfindungsgemäßen System eine luftdruckabhängige Anfahrsteuerung des Fahrzeuges möglich.For example, it may be provided that the transmission control via the vehicle network to access a storage medium or the like, in which the air pressure-dependent setpoint curves of the engine speed are stored as characteristics. In this way, with the system according to the invention, an air pressure-dependent starting control of the vehicle is possible.
Vorzugsweise ist das vorgeschlagene System zum Durchführen des ebenfalls vorgeschlagenen Verfahrens vorgesehen. Es ist auch möglich, dass das vorgeschlagene Verfahren und/oder das System bei anderen Getrieben und anderen Betriebszuständen eingesetzt werden kann, wobei eventuell bestimmte Abwandlungen notwendig sind.Preferably, the proposed system is provided for carrying out the method also proposed. It is also possible that the proposed method and / or the system in other transmissions and other operating conditions may be used, with certain modifications may be necessary.
Die vorliegende Erfindung wird anhand der Zeichnung weiter erläutert.The present invention will be further explained with reference to the drawing.
Die einzige Figur der Erfindung zeigt ein Diagramm, in dem mehrere Sollwertverläufe der Motordrehzahl n_Eng bei verschiedenen Luftdrücken p_Luft über die Zeit während eines Anfahrvorganges dargestellt sind. Ferner ist ein Verlauf einer Getriebeeingangsdrehzahl njn ebenfalls während des Anfahrvorganges gezeigt.The sole FIGURE of the invention shows a diagram in which a plurality of nominal value curves of the engine speed n_Eng at different air pressures p_air over time during a starting process are shown. Furthermore, a course of a transmission input speed njn is also shown during the starting process.
Beim Anfahrvorgang wird der Sollwert der Motordrehzahl nJΞng auf einen applizierbaren Wert angehoben, der von der Fahrpedalstellung abhängt. Parallel zum Momentaufbau an der Kupplung wird die Getriebeeingangsdrehzahl n_ln beobachtet. Sobald die Getriebesteuerung feststellt, dass die Drehzahldifferenz zwischen der Getriebeeingangsdrehzahl n_ln und dem Sollwert der Motordrehzahl nJEng unter einen Schwellenwert fällt, wird der Sollwert der Motordrehzahl nJΞng tangential an die Getriebeeingangsdrehzahl n_ln herangeführt.During the starting process, the setpoint value of the engine speed nJΞng is raised to an applicable value, which depends on the accelerator pedal position. Parallel to the torque build-up on the clutch, the transmission input speed n_ln is observed. As soon as the transmission control determines that the speed difference between the transmission input speed n_ln and the engine speed setpoint nJEng falls below a threshold value, the engine speed nJΞng set point is tangentially applied to the transmission input speed n_ln.
Auf diese Weise kann ein Momentensprung zwischen dem Gleit-/Haft- Übergang an der Kupplung vermieden werden. Wenn die Kupplung haftet, wird das Motormoment linear an das Fahrerwunschmoment herangeführt.In this way, a torque jump between the sliding / adhesive transition can be avoided on the coupling. If the clutch adheres, the engine torque is linearly brought to the driver's desired torque.
Erfindungsgemäß ist aus dem Diagramm ersichtlich, dass verschiedene Sollwertverläufe der Motordrehzahl nJΞng als Kennlinien hinterlegt werden, die verschiedenen Luftdrücken p_Luft der Umgebung des Fahrzeugs zugeordnet sind. Auf diese Weise kann der Sollwert der Motordrehzahl n_Eng bei kleiner werdenden Luftdrücken pJLuft entsprechend erhöht werden, so dass mit dem erfindungsgemäßen Verfahren eine Anpassung an das geringere Leistungsvermögen des Verbrennungsmotors bei fallendem Luftdruck p_Luft realisiert wird. Dadurch wird die Gefahr des Abwürgens des Verbrennungsmotors, wenn sich das Fahrzeug in großer Höhe befindet, minimiert.According to the invention, it can be seen from the diagram that various desired value curves of the engine speed nJΞng are stored as characteristic curves which are assigned to the various air pressures p_air of the surroundings of the vehicle. In this way, the target value of the engine speed n_Eng can be correspondingly increased with decreasing air pressures pJAir, so that with the method according to the invention an adaptation to the lower performance of the internal combustion engine is realized with decreasing air pressure p_air becomes. This minimizes the risk of stalling the engine when the vehicle is at high altitude.
Der in der Figur dargestellte Pfeil gibt bei den SoHwertverläufen der Motordrehzahl nJEng die Richtung an, in der der Luftdruck pj_uft ansteigt. Demzufolge erhöhen sich die Werte der Sollwertverläufe bei fallendem Luftdruck p_Luft. The arrow shown in the figure indicates the direction in which the air pressure pj_uft rises in the values of the engine speed nJEng. As a result, the values of the setpoint curves increase with falling air pressure p_air.
Bezugszeichenreference numeral
n_Eng Sollwert der Motord rehzahl n_ln Getriebeeingangsdrehzahl pJLuft Luftdruck der Umgebung des Fahrzeugesn_Eng Motor speed setpoint n_ln Transmission input speed pJAir Air pressure of the surroundings of the vehicle
CAN Fahrzeugnetzwerk CAN vehicle network

Claims

Patentansprüche claims
1. Verfahren zum Steuern und/oder Regeln eines Anfahrvorganges bei einem automatisierten Getriebe eines Fahrzeuges, bei dem zum Anfahren ein Sollwert der Motordrehzahl vorgegeben wird, und bei dem das Kupplungsmoment durch Vorgabe einer Kupplungsposition eingestellt wird, dadurch gekennzeichnet, dass der Sollwert der Motordrehzahl (n__Eng) beim Anfahren in Abhängigkeit des Luftdruckes (p_Luft) der Umgebung des Fahrzeuges vorgegeben wird.1. A method for controlling and / or regulating a starting process in an automated transmission of a vehicle, in which for setting a desired value of the engine speed is set, and wherein the clutch torque is set by specifying a clutch position, characterized in that the target value of the engine speed ( n__Eng) when starting depending on the air pressure (p_air) the environment of the vehicle is specified.
2. Verfahren nach Anspruch 1 , dadurch gekennzeichnet, dass der Sollwert der Motordrehzahl (n_Eng) bei fallendem Luftdruck (pJLuft) erhöht wird.2. The method according to claim 1, characterized in that the desired value of the engine speed (n_Eng) is increased with decreasing air pressure (pJAir).
3. Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass das maximal einzuleitende Kupplungsmoment begrenzt wird.3. The method according to claim 1 or 2, characterized in that the maximum to be initiated clutch torque is limited.
4. Verfahren nach Anspruch 3, dadurch gekennzeichnet, dass das maximal verfügbare Motormoment des Verbrennungsmotors des Fahrzeuges als Grenzwert für das einzuleitende Kupplungsmoment verwendet wird.4. The method according to claim 3, characterized in that the maximum available engine torque of the internal combustion engine of the vehicle is used as a limit value for the clutch torque to be introduced.
5. Verfahren nach einem der vorangehenden Ansprüche, dadurch g e - kennzeichnet, dass der jeweilige Luftdruck (pJLuft) der Umgebung des Fahrzeuges und das maximal verfügbare Motormoment über ein Fahrzeugnetzwerk (CAN) erhalten wird.5. The method according to any one of the preceding claims, characterized g e - indicates that the respective air pressure (pJAir) of the environment of the vehicle and the maximum available engine torque via a vehicle network (CAN) is obtained.
6. Verfahren nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, dass durch die Getriebesteuerung der luftdruckabhängige Sollwert der Motordrehzahl (n_Eng) der Motorsteuerung über das Fahr- zeugnetzwerk (CAN) vorgegeben wird und dass die tatsächliche Motordrehzahl durch die Getriebesteuerung beobachtet wird.6. The method according to any one of the preceding claims, characterized in that by the transmission control of the air pressure-dependent setpoint of the engine speed (n_Eng) of the engine control over the driving network (CAN) is specified and that the actual engine speed is monitored by the transmission control.
7. System zum Steuern und/oder Regeln eines Anfahrvorganges bei einem automatisierten Getriebe eines Fahrzeuges, mit einer Getriebesteuerung und einer Motorsteuerung, die über ein Fahrzeugnetzwerk (CAN) datentechnisch miteinander verbunden sind, wobei die Getriebesteuerung der Motorsteuerung zum Anfahren einen Sollwert der Motordrehzahl vorgibt und das Kupplungsmoment durch Vorgabe einer Kupplungsposition einstellt, insbesondere zum Durchführen des Verfahrens nach einem der vorangehenden Ansprüche, dadurch g e k e n n z e i c h n e t , dass die Getriebesteuerung derart mit dem Fahrzeugnetzwerk (CAN) gekoppelt ist, dass der Sollwert der Motordrehzahl (n_Eng) beim Anfahren in Abhängigkeit des Luftdruckes (p_Luft) der Umgebung des Fahrzeuges einstellbar ist. 7. System for controlling and / or regulating a starting process in an automated transmission of a vehicle, with a transmission control and an engine control, which are connected to each other via a vehicle network (CAN) data technology, the transmission control of the engine control for starting a target value of the engine speed specifies and sets the clutch torque by specifying a clutch position, in particular for carrying out the method according to one of the preceding claims, characterized in that the transmission control is so coupled to the vehicle network (CAN) that the target value of the engine speed (n_Eng) when starting depending on the air pressure ( p_air) of the environment of the vehicle is adjustable.
PCT/EP2007/060887 2006-11-04 2007-10-12 Controlling and/or regulating a starting process WO2008052872A1 (en)

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