EP2035672B1 - Unité de commande pour le fonctionnement d'un entraînement de véhicule - Google Patents

Unité de commande pour le fonctionnement d'un entraînement de véhicule Download PDF

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Publication number
EP2035672B1
EP2035672B1 EP07726144A EP07726144A EP2035672B1 EP 2035672 B1 EP2035672 B1 EP 2035672B1 EP 07726144 A EP07726144 A EP 07726144A EP 07726144 A EP07726144 A EP 07726144A EP 2035672 B1 EP2035672 B1 EP 2035672B1
Authority
EP
European Patent Office
Prior art keywords
torque
speed
control unit
limit
unit according
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.)
Ceased
Application number
EP07726144A
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German (de)
English (en)
Other versions
EP2035672A1 (fr
Inventor
Lothar Rehm
Jürgen Schenk
Hans-Christoph Wolf
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.)
Mercedes Benz Group AG
Original Assignee
Daimler 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
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Publication of EP2035672A1 publication Critical patent/EP2035672A1/fr
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Publication of EP2035672B1 publication Critical patent/EP2035672B1/fr
Ceased legal-status Critical Current
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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
    • F02D11/00—Arrangements for, or adaptations to, non-automatic engine control initiation means, e.g. operator initiated
    • F02D11/06—Arrangements for, or adaptations to, non-automatic engine control initiation means, e.g. operator initiated characterised by non-mechanical control linkages, e.g. fluid control linkages or by control linkages with power drive or assistance
    • F02D11/10—Arrangements for, or adaptations to, non-automatic engine control initiation means, e.g. operator initiated characterised by non-mechanical control linkages, e.g. fluid control linkages or by control linkages with power drive or assistance of the electric type
    • F02D11/105—Arrangements for, or adaptations to, non-automatic engine control initiation means, e.g. operator initiated characterised by non-mechanical control linkages, e.g. fluid control linkages or by control linkages with power drive or assistance of the electric type characterised by the function converting demand to actuation, e.g. a map indicating relations between an accelerator pedal position and throttle valve opening or target engine torque
    • 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
    • F02D41/14—Introducing closed-loop corrections
    • F02D41/1497—With detection of the mechanical response of the engine
    • 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
    • F02D2200/50—Input parameters for engine control said parameters being related to the vehicle or its components
    • F02D2200/501—Vehicle speed
    • 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

Definitions

  • the invention relates to a control unit for operating a vehicle drive and the application of the control unit for operating an internal combustion engine or an electrical machine in a motor vehicle and a method for operating the device.
  • the monitoring of drive control devices is generally designed as a three-level monitoring concept.
  • a surveillance concept is from the document DE 44 38 714 A1 known. It describes a method and a device for controlling the drive power of a vehicle with a microcomputer having at least two mutually independent planes, wherein a first level performs the control functions and a second level performs the monitoring functions.
  • a third level is a control level which controls the surveillance level and thus the microcomputer.
  • the object of the invention is to provide a control unit for a vehicle drive with improved fault detection sensitivity.
  • the control unit has a first limiting device, in which a preliminary setpoint torque can be limited upward with a maximum limit torque to a final target torque when a detected vehicle speed is greater than or equal to a starting limit speed.
  • this provisional setpoint torque can be limited upward to a final setpoint torque with a limit torque dependent on the measured / manipulated variables of the accelerator pedal value encoder if the detected vehicle speed is below a starting limit speed.
  • the approach limit speed defines a limit to the vehicle speed. From and above this approach limit speed, the vehicle is in normal driving. In this area, the setpoint torque is limited by a maximum limit torque upwards. This prevents the drive from attempting to generate an undesirably high torque in the event of a fault.
  • a limiting device by means of which the limiting torque, which is dependent on the measuring / manipulated variables of the accelerator pedal value encoder, can be limited downwards with a definable minimum limiting torque.
  • the limiting torque which is dependent on the measuring / manipulated variables of the accelerator pedal value encoder, can be limited downwards with a definable minimum limiting torque.
  • the minimum limit torque represents this lower operating limit and ensures proper operation of the vehicle drive.
  • the figure shows a control unit of a vehicle drive, typically an internal combustion engine.
  • the illustrated control unit is also suitable for other drives, such as electromechanical drives, hybrid drives or fuel cells.
  • the control unit has inter alia a process level 1 for the calculation of drive control and diagnostic functions, which is referred to below as a function computer 1, and an associated process monitoring level 2 for monitoring torque-relevant drive control functions of the function computer 1, hereinafter referred to as monitoring computer 2 becomes.
  • the function computer 1 receives via external connections 3a to 3d information from measuring or position encoders on the operating state of the motor vehicle and / or the internal combustion engine. For this measurement / manipulated variables are forwarded to the function computer 1.
  • the functional computer 1 receives information about a pedal value transmitter of an accelerator pedal via an external connection 3a, information about the setting of a vehicle speed limiter via a connection 3b, and a torque specification Md of an electronic stability program or the like via a connection 3c.
  • a processing device 4 of the function computer 1 processes the incoming information and calculates a provisional setpoint torque Mvsoll from the different incoming measurement / manipulated variables and possibly the additional information assigned to them. In addition, the processing device 4 controls the starting torque. Furthermore, the device 4 adapts the driving behavior of the motor vehicle to the pedal value requested by the pedal value transmitter of the gas pedal.
  • An allocation device 5 of the function computer 1 assigns a maximum speed Nmax to a preliminary setpoint value Mvsoll supplied to it by the processing device 4.
  • Nmax the value of Nmax is compared with a current actual speed Nist.
  • Nmax subtracts the value for the current actual speed Nist. This may be the speed of a vehicle wheel or vehicle drive (e.g., an internal combustion engine).
  • the device 6 supplies the result of this operation to a device 7.
  • the device 7 is typically designed as a speed controller, which reduces the actual speed Nist, if this is greater than Nmax.
  • the device 7 assigns the maximum speed Nmax an accelerator pedal-dependent torque limit value MGrenz and supplies this torque limit value MGrenz to a selector 8.
  • this accelerator pedal value-dependent torque limit value MGrenz is already determined in the processing device 4 or the allocation device 5 from Mvsoll.
  • the selector 8 is also fed a value for a minimum limit torque MGmin.
  • This minimum limit torque MGmin results from the requirements of the vehicle drive for proper operation. For example, these are the legal requirements for the exhaust emissions of an internal combustion engine.
  • the selector 8 is designed, for example, as a comparator.
  • the comparator 8 determines the larger of the values of the two moments MGmin and MGrenz as maximum torque and supplies this maximum torque to an input of a switching device 9.
  • the resulting maximum torque usually corresponds to the torque limit value MGrenz. Only when the torque limit value MGrenz is smaller than MGmin, the device 8 outputs MGmin as the output value to the switching device 9.
  • the switching device 9 has a further input to which a maximum limit torque Mmax is supplied.
  • a maximum limit torque Mmax is supplied.
  • This may be a maximum limit torque of the drive means, e.g. an internal combustion engine or act at a maximum torque limit of a vehicle wheel.
  • the switching device 9 is connected to a device 10. This device 10 controls the switching position of the switching device. 9
  • the device 10 connects the input of the switching device 9, the maximum limit torque applied to the Mmax, with the output of the switching device 9 when the vehicle speed does not fall below the limit value x.
  • Mmax is output from the switching device 9 to the device 11.
  • the device 10 connects the input of the switching device 9 connected to the device 8 to the output of the switching device 9 when the vehicle speed falls below a limit value x.
  • the output value of the device 8 (MGrenz or MGmin) is output from the switching device 9 to a limiting device 11.
  • device 10 typically sends a control signal to the switching device 9.
  • the limiting device 11 receives from the processing device 4 the provisional setpoint torque Mvsoll. This provisional setpoint torque Mvsoll is limited in the limiting device 11 to a final setpoint torque Msetpoint.
  • the device 11 also receives from the monitoring unit 2 a value for a final allowable moment Mzul.
  • the limiting device 11 determines from the different supplied moments Mvsoll, Mmax or MGrenz or MGmin and Mzul a final value Msoll. For this purpose, the provisional setpoint torque Mvsoll with the limit value Mmax or MGrenz or MGmin and the final permissible torque Mzul is limited to the final setpoint torque Msetpoint. The resulting final setpoint torque Msetpoint is output for conversion by the function computer 1 of the control unit.
  • the monitoring computer 2 of the control unit receives information about the external connections 3a to 3d Operating state of the motor vehicle and the vehicle drive. In the illustrated embodiment, this information is forwarded to the monitoring computer 2 via the function computer 1.
  • a device 12 of the monitoring computer 2 processes the incoming information and calculates a provisional permissible torque Mvzul from the different incoming torque requests and possibly the additional information assigned to them. In addition, this processing device 12 controls the starting torque. Furthermore, the device 12 adapts the driving behavior of the motor vehicle to the pedal value requested by the pedal value transmitter of the gas pedal.
  • An allocation device 13 of the monitoring computer 2 assigns a maximum speed Nmax to a provisional permissible torque Mvzul supplied to it by the processing device 12. For this purpose, a characteristic field or a conversion function is stored in the allocation device 13, for example.
  • the value of Nmax is compared with a current actual speed Nist.
  • Nmax subtracts the value for the current actual speed Nist. This may be the speed of a vehicle wheel or a vehicle drive (eg an internal combustion engine).
  • the device 14 supplies the result of this operation to a device 15.
  • the device 16 is also still connected to means 17.
  • This device 17 outputs a signal (or a value 1) to the device 16 when the vehicle speed v falls below a limit value x.
  • the device 16 is typically implemented as a logical "AND”. It outputs a control signal to a switching device 19 when a signal is present at both inputs of the device 16 (or device 17 and device 15 both send a value 1 to the device 16). Between the device 16 and a device 19, a device 18 is provided in the illustrated embodiment.
  • the switching device 19 has an input to which the maximum torque Mmax a vehicle wheel or the vehicle drive is supplied.
  • the switching device 19 has a further input to which a value for the minimum limit torque MGmin is supplied.
  • the switching device 19 is connected to the device 16. If the device 16 sends no control signal, the input of the switching device 19 is connected to the output of the switching device 19, to which the maximum limit torque Mmax is applied. In this case, the maximum limit torque Mmax is passed from the switching device 19 to a device 21.
  • the input of the switching device 19 is connected to the output of the switching device 19, to which the minimum limiting torque MGmin is applied.
  • the minimum limit torque MGmin is passed from the switching device 19 to a limiting device 21.
  • a device 20 between the switching device 19 and the device 21 to a device 20 is provided.
  • This device 20 receives from the switching device 19 a value for the minimum limit torque MGmin or a value for the maximum limit torque Mmax. If the new incoming value deviates from the previous old value, then device 20 adjusts its output value via a transient function, e.g. a ramp, steadily to the newly received value. The device 20 outputs its output value to a device 21.
  • a transient function e.g. a ramp
  • the determined value for the final permissible torque Mzul is forwarded to the function computer 1 for the purpose of limiting Msoll.
  • the monitoring computer 2 outputs the final permissible torque Mzul for implementing a speed-dependent torque comparison and, if appropriate, for triggering fault reactions to other, not shown, functional areas of the monitoring computer 2.
  • a provisional desired torque Mvsoll is determined in the device 4 from many different torque requests.
  • this target torque Mvsoll is limited by a maximum torque Mmax.
  • the monitoring computer 2 forms as another Limit a value for a final allowable moment Mzul. Since v ⁇ x is not satisfied, the switching device 19 remains in the illustrated basic position and forwards the moment Mmax on. Accordingly, this value Mmax or a transition value for Mmax formed in device 20 in device 21 is compared with Mvzul. The smaller of these two values is output as the current value for Mzul.
  • the switching device 9 switches over and forwards the values output by the device 8.
  • the accelerator pedal-dependent limit torque MGrenz is forwarded. Only if the value of MGrenz falls below the value of MGmin does the device 8 forward MGmin.
  • the value Mzul is formed as a further limitation. If the vehicle speed lies below the limit value x and the actual rotational speed Nist does not exceed the limit value Nmax, then, as in normal operation, Mmax or a transition value for Mmax formed in device 20 in device 21 is compared with Mvzul. The smaller of the two values is output as the current value for Mzul.
  • the provisional setpoint torque Mvsoll in the device 11 is generally limited by MGrenz and Mmax to a final setpoint torque Msetpoint upwards.
  • the function computer 1 limits the provisional setpoint torque Mvsetpoint with MGmin. Since MGmin is a very low value, this usually means that a final target torque Msetpoint limited to MGmin is formed in device 11.
  • the monitoring level 2 in the starting range detects that the rotational speed Nist exceeds the maximum rotational speed Nmax, then means 16 sends a signal to the switching device 19.
  • the minimum limit torque MGmin is passed from the switching device 19 or a transition value formed in the device 20 to the device 21.
  • the final permissible torque Mzul is limited to MGmin upwards.
  • Mzul is passed on to the device 11 of the function computer 1.
  • the provisional setpoint torque Mvsoll is now limited by Mzul to the value of MGmin and this value is output as the desired torque Msoll to be controlled.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Electric Propulsion And Braking For Vehicles (AREA)
  • Hybrid Electric Vehicles (AREA)

Abstract

L'invention concerne une unité de commande pour le fonctionnement d'un entraînement de véhicule, ainsi qu'un procédé pour mettre en œuvre l'unité de commande. L'objectif de l'invention consiste à fournir une unité de commande pour un entraînement de véhicule avec une sensibilité de détection d'erreurs améliorée. À cet effet le moment théorique final (Msoll) émis par l'unité de commande est limité vers le haut avec un moment limite (Mgrenz) en fonction des grandeurs de mesure/commande d'un capteur d'accélérateur, lorsque la vitesse du véhicule enregistrée (v) est inférieure à une vitesse limite au démarrage (x).

Claims (12)

  1. Unité de commande pour le fonctionnement d'un entraînement de véhicule doté d'un ordinateur (1) de traitement de fonction et d'un ordinateur (2) de contrôle,
    - l'ordinateur (1) de traitement de fonction étant relié par une liaison de données (3a, 3b, 3c, 3d) à un capteur de pédale d'accélérateur ou à un autre capteur de mesure ou de commande, et
    - à partir des grandeurs de mesure / de commande du capteur de mesure ou de commande un dispositif (4) de traitement peut former un moment théorique (Mvsoll) provisoire, caractérisée en ce qu'
    est prévu un premier dispositif (11) de limitation dans lequel ledit moment théorique (Mvsoll) provisoire
    - peut être limité vers le haut avec un moment limite (Mmax) maximal à un moment théorique (Msoll) final lorsqu'une vitesse (v) du véhicule enregistrée est supérieure ou égale à une vitesse (x) limite au démarrage,
    - peut être limité vers le haut avec un moment limite (Mgrenz) en fonction des grandeurs de mesure / commande du capteur de pédale d'accélérateur lorsque la vitesse (v) du véhicule enregistrée est inférieure à une vitesse (x) limite au démarrage.
  2. Unité de commande selon la revendication 1, caractérisée en ce qu'est prévu un second dispositif (8) de limitation dans lequel le moment limite (MGrenz) peut être limité vers le bas avec un moment limite (MGmin) minimal pouvant être défini.
  3. Unité de commande selon la revendication 2, caractérisée en ce que dans le premier dispositif (11) de limitation le moment théorique (Msoll) final peut être limité vers le bas avec une valeur limite (Mzul) variable calculée par un ordinateur (2)de contrôle.
  4. Unité de commande selon la revendication 2, caractérisée en ce que sont prévus un système (5) d'affectation et un régulateur (7) de vitesse,
    - une vitesse (Nmax) maximale peut être affectée au moment théorique (Mvsoll) provisoire au moyen du système (5) d'affectation et
    - une vitesse (Nist) enregistrée peut être abaissée au moyen du régulateur (7) de vitesse lorsqu'une vitesse (Nist) enregistrée est supérieure à la vitesse (Nmax) maximale.
  5. Unité de commande selon l'une quelconque des revendications 1 à 3, caractérisé en ce que
    - les grandeurs de mesure / commande entrant dans l'ordinateur (1) de traitement de fonction entrent également dans un ordinateur (2) de contrôle associé à l'ordinateur (1) de traitement de fonction,
    - dans un ordinateur (2) de contrôle, un moment (Mvzul) autorisé provisoire peut être formé à partir des grandeurs de mesure / commande entrant.
  6. Unité de commande selon la revendication 5. caractérisée en ce que l'ordinateur (2) de contrôle comprend un dispositif (21) de limitation dans lequel le moment (Mvzul) autorisé provisoire peut être limité vers le haut avec le moment (Mmax) maximal à un moment (Mzul) autorisé définitif lorsque la vitesse d'entraînement (Nist) enregistrée est inférieure ou égale à la vitesse (Nmax) maximale associée à celle-ci et / ou que la vitesse (v) du véhicule est supérieure ou égale à la valeur limite (x) associée à celle-ci.
  7. Unité de commande selon la revendication 5, caractérisée en ce que l'ordinateur (2) de contrôle présente un dispositif (21) de limitation dans lequel le moment (Mvzul) autorisé provisoire peut être limité vers le haut avec le moment limite (MGmin) minimal autorisé à un moment (Mzul) autorisé définitif lorsque la vitesse d'entraînement (Nist) enregistrée est supérieure à la vitesse (Nmax) maximale associée à celle-ci et que la vitesse (v) du véhicule dépasse vers le bas la valeur limite (x) associée à celle-ci.
  8. Unité de commande selon la revendication 7, caractérisée en ce que l'ordinateur (2) de contrôle peut reconnaître que la vitesse (Nist) de l'entraînement de véhicule est supérieure ou égale à la vitesse (Nmax) maximale et que la vitesse (v) du véhicule dépasse vers le haut la valeur (x) limite associée à celle-ci que lorsque ces conditions se présentent ensemble sur une durée de temps (dt) pouvant être définie de manière variable.
  9. Unité de commande selon l'une quelconque des revendications 7 à 8, caractérisée en ce que dans un dispositif (20) de l'ordinateur (2) de contrôle peut être formée une fonction de transition pour la transition continue entre une valeur limite (Mmax ; MGmin) déjà existante et une nouvelle valeur limite (MGmin ; Mmax) et fournie au dispositif (21) de limitation.
  10. Unité de commande selon la revendication 8 ou 9, caractérisée en ce que dans l'ordinateur (2) de contrôle, un signal de défaut peut être généré et émis lorsque celui-ci détecte que la vitesse (Nist) enregistrée de l'entraînement de véhicule est supérieure à une vitesse (Nmax) maximale.
  11. Utilisation d'une unité de commande selon l'une quelconque des revendications 1 à 11 pour faire fonctionner un moteur à combustion interne ou une machine électrique dans un véhicule à moteur.
  12. Procédé pour faire fonctionner l'unité de commande selon l'une quelconque des revendications 1 à 10.
EP07726144A 2006-07-05 2007-06-23 Unité de commande pour le fonctionnement d'un entraînement de véhicule Ceased EP2035672B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102006031007A DE102006031007A1 (de) 2006-07-05 2006-07-05 Steuereinheit zum Betreiben eines Fahrzeugantriebes
PCT/EP2007/005560 WO2008003410A1 (fr) 2006-07-05 2007-06-23 Unité de commande pour le fonctionnement d'un entraînement de véhicule

Publications (2)

Publication Number Publication Date
EP2035672A1 EP2035672A1 (fr) 2009-03-18
EP2035672B1 true EP2035672B1 (fr) 2010-03-31

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EP07726144A Ceased EP2035672B1 (fr) 2006-07-05 2007-06-23 Unité de commande pour le fonctionnement d'un entraînement de véhicule

Country Status (4)

Country Link
US (1) US7996138B2 (fr)
EP (1) EP2035672B1 (fr)
DE (2) DE102006031007A1 (fr)
WO (1) WO2008003410A1 (fr)

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Publication number Publication date
WO2008003410A1 (fr) 2008-01-10
DE102006031007A1 (de) 2008-01-10
EP2035672A1 (fr) 2009-03-18
US20090319149A1 (en) 2009-12-24
DE502007003321D1 (de) 2010-05-12
US7996138B2 (en) 2011-08-09

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