EP2729339A1 - Method for activating a hybrid drive of a vehicle - Google Patents

Method for activating a hybrid drive of a vehicle

Info

Publication number
EP2729339A1
EP2729339A1 EP12727656.6A EP12727656A EP2729339A1 EP 2729339 A1 EP2729339 A1 EP 2729339A1 EP 12727656 A EP12727656 A EP 12727656A EP 2729339 A1 EP2729339 A1 EP 2729339A1
Authority
EP
European Patent Office
Prior art keywords
accelerator
drive torque
accelerator pedal
maximum
characteristic
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Withdrawn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
EP12727656.6A
Other languages
German (de)
French (fr)
Inventor
Markus Eisele
Yvonne Wiegand
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 EP2729339A1 publication Critical patent/EP2729339A1/en
Withdrawn legal-status Critical Current

Links

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
    • B60W20/00—Control systems specially adapted for hybrid vehicles
    • 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
    • B60W10/08—Conjoint control of vehicle sub-units of different type or different function including control of propulsion units including control of electric propulsion units, e.g. motors or generators
    • 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
    • B60W20/00—Control systems specially adapted for hybrid vehicles
    • B60W20/10—Controlling the power contribution of each of the prime movers to meet required power demand
    • 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
    • B60W50/00—Details of control systems for road vehicle drive control not related to the control of a particular sub-unit, e.g. process diagnostic or vehicle driver interfaces
    • B60W50/08—Interaction between the driver and the control system
    • B60W50/082—Selecting or switching between different modes of propelling
    • 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
    • B60W50/00—Details of control systems for road vehicle drive control not related to the control of a particular sub-unit, e.g. process diagnostic or vehicle driver interfaces
    • B60W50/08—Interaction between the driver and the control system
    • B60W50/085—Changing the parameters of the control units, e.g. changing limit values, working points by control input
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K26/00—Arrangements or mounting of propulsion unit control devices in vehicles
    • B60K26/02—Arrangements or mounting of propulsion unit control devices in vehicles of initiating means or elements
    • B60K2026/025—Input devices for controlling electric drive motors
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K6/00—Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines ; Control systems therefor, i.e. systems controlling two or more prime movers, or controlling one of these prime movers and any of the transmission, drive or drive units Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00
    • B60K6/20—Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines ; Control systems therefor, i.e. systems controlling two or more prime movers, or controlling one of these prime movers and any of the transmission, drive or drive units Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00 the prime-movers consisting of electric motors and internal combustion engines, e.g. HEVs
    • B60K6/42—Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines ; Control systems therefor, i.e. systems controlling two or more prime movers, or controlling one of these prime movers and any of the transmission, drive or drive units Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00 the prime-movers consisting of electric motors and internal combustion engines, e.g. HEVs characterised by the architecture of the hybrid electric vehicle
    • B60K6/48—Parallel type
    • 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
    • B60W2510/08—Electric propulsion units
    • B60W2510/083—Torque
    • 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
    • B60W50/00—Details of control systems for road vehicle drive control not related to the control of a particular sub-unit, e.g. process diagnostic or vehicle driver interfaces
    • B60W50/08—Interaction between the driver and the control system
    • B60W50/087—Interaction between the driver and the control system where the control system corrects or modifies a request from the driver
    • 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
    • Y02T10/62—Hybrid vehicles
    • 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
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S903/00—Hybrid electric vehicles, HEVS
    • Y10S903/902—Prime movers comprising electrical and internal combustion motors

Definitions

  • the present invention relates to a method for driving a hybrid drive of a vehicle according to the closer defined in the preamble of claim 1.
  • a motor vehicle with hybrid drive comprises two drive units for generating the drive torque, wherein the drive units are operable both jointly and separately for generating the drive torque. Furthermore, a device for specifying a driver's request and a control unit for processing the driver's request and for generating control signals for controlling the drive units are provided.
  • both an internal combustion engine drive torque and an electromotive drive torque can be used.
  • the electromotive drive torque is insufficient to achieve the desired desired drive torque
  • the internal combustion engine drive torque can be used to support in addition to achieve the desired vehicle acceleration or vehicle speed to support.
  • the drive torque of the electric drive is sufficient, it is possible to drive purely electrically and switch off the internal combustion engine in order to save fuel and to drive emission-free.
  • the driver command torque which corresponds to the nominal drive torque, is derived from the accelerator pedal position or accelerator pedal position via an accelerator pedal characteristic.
  • the present invention is based on the object to propose a method of the type described above, with the most comfortable and emission-free driving is ensured if necessary.
  • a method for driving a hybrid drive, for example a parallel hybrid or the like, of a vehicle in which, for example, via a corresponding drive device, such as a control unit or the like, a drive torque desired internal combustion engine and / or electric motor in response to an accelerator pedal position over a deposited, normal accelerator characteristic is provided to drive the vehicle.
  • a corresponding drive device such as a control unit or the like
  • the normal, originally stored accelerator characteristic curve can be adapted in such a way that the maximum desired drive torque corresponds to the maximum possible electromotive drive torque when the driver request for emission-free driving is recognized.
  • the vehicle In this way it is possible for the vehicle to be driven exclusively electrically by transmitting the driver's request for emission-free driving with the aid of the method according to the invention, so that the internal combustion engine is switched off and the vehicle is switched off without generating emissions. is driven.
  • the normal accelerator characteristic is adjusted accordingly, so that the accelerator pedal position or accelerator pedal position is reinterpreted accordingly.
  • the accelerator characteristic curve for purely electric driving can be modified in such a way that, as it were, the hybrid driving sector is eliminated.
  • a particularly simple embodiment of the present invention can therefore provide that the adjusted accelerator characteristic with respect to the stored accelerator characteristic remains largely unchanged, but quasi cut off above the maximum drive torque of the electric drive, so that the connection of the internal combustion engine drive also omitted when the driver chooses an accelerator pedal position of up to 100%.
  • the gradient is changed in comparison to the originally stored accelerator characteristic such that a value of about 100% of the accelerator pedal position is assigned the maximum possible electromotive drive torque as the maximum desired drive torque.
  • the driving feeling for the driver with the adjusted accelerator characteristic becomes more sensitive due to the shallower gradient, since the ratio between acceleration behavior and accelerator pedal position is changed accordingly. Since the entire accelerator pedal area is utilized, there is advantageously no dead area in the control.
  • FIG. 1 shows a diagram with a profile of the desired drive torque on the accelerator pedal position according to a first embodiment of a method according to the invention for driving a hybrid drive of a vehicle;
  • Figure 2 is a diagram with a course of the drive torque across the
  • Accelerator pedal position according to a second embodiment of the method according to the invention.
  • FIGS. 1 and 2 show diagrams with adapted accelerator characteristic curves I and II shown by way of example, which are used in the context of the method according to the invention for driving a hybrid drive of a vehicle.
  • accelerator pedal area is between the non-actuated accelerator pedal position FP, this corresponds to the value 0%, and the fully actuated accelerator pedal position FP, this corresponds to the value 100%.
  • the accelerator pedal characteristic curve is adapted such that the maximum target drive torque T corresponds to n-max the maximum electric motor drive torque T E -max.
  • the transmission of the driver's request can for example be done automatically or manually via a switch or the like, so then is driven purely electrically, so that an emission-free drive is realized, since the area hybrid driving is eliminated.
  • FIG. 1 shows the profile of the desired drive torque T so n via the accelerator pedal position FP according to an adapted accelerator characteristic I within the scope of a first embodiment variant of the method.
  • the adjusted accelerator characteristic with respect to the originally stored accelerator characteristic with respect to the gradient or the gradient remains unchanged, above the maximum torque of the electric drive no further increase of the drive torque Tson is allowed, so that, for example, at a value of 60% of the accelerator pedal position FP maximum drive desired torque T so n-max is reached and thus corresponds to the maximum electric drive desired torque T E - m ax.
  • the maximum drive desired torque T so n-max remains constant from a value of about 60% of the accelerator pedal position FP to the value of 100% of the accelerator pedal position FP.
  • FIG. 2 shows a further adapted accelerator characteristic II in the context of a second variant of the method according to the invention, in which the gradient or the slope of the adapted accelerator characteristic II is changed in comparison to the originally stored accelerator characteristic such that a value of approximately 100% of the accelerator pedal position FP is assigned as the maximum drive torque Tson-max, the maximum electric motor drive torque T E - m ax.
  • the entire accelerator pedal area is used for the electric driving, so that virtually a kind of rescaling takes place. Since the slope or the gradient in the adapted accelerator characteristic II is flatter than in the original accelerator characteristic, a more sensitive driving without dead zones over the entire accelerator pedal position range is made possible.
  • the driver can transmit the transmission of the driver's request for emission-free driving manually via a switch or automatically.
  • the termination of the emission-free driving can be stopped manually by corresponding actuation of the switch, for example by renewed actuation of the switch or automatically. be.
  • a so-called kick-down switch on the accelerator pedal can be used.
  • An automatic termination of the emission-free driving can be determined, for example, by vehicle-related circumstances that make an end to the zero-emission driving meaningful. In particular, this may be the case when the electric drive torque is insufficient to accelerate the vehicle in the desired manner. This can be recognized, for example, by further reducing the vehicle speed or the output speed despite the full load of the electric drive. In this case, the driver can be informed via a display or a warning lamp that the emission-free driving is automatically ended. In this case, it is possible for the automatic termination to take place only after a predetermined period of time, so that the driver can react to the indication as needed and prevent automatic termination. This can for example be done by the switch is operated again, so that the emission-free electric driving is maintained.

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  • Engineering & Computer Science (AREA)
  • Automation & Control Theory (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Human Computer Interaction (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Electric Propulsion And Braking For Vehicles (AREA)
  • Hybrid Electric Vehicles (AREA)

Abstract

The invention relates to a method for activating a hybrid drive of a vehicle, wherein a drive target torque (TsoII) is provided by an internal combustion engine and/or an electrical engine in dependence on an accelerator pedal position (FP) via a stored accelerator pedal characteristic curve for driving the vehicle, wherein upon recognizing a driver's wish for emission-free driving, the accelerator pedal characteristic curve (I, II) is adjusted so that the maximum drive target torque (TsoII) equals the maximum electrical engine drive torque (TE-max).

Description

Verfahren zum Ansteuern eines Hybridantriebes eines Fahrzeuges  Method for driving a hybrid drive of a vehicle
Die vorliegende Erfindung betrifft ein Verfahren zum Ansteuern eines Hybridantriebes eines Fahrzeuges gemäß der im Oberbegriff des Patentanspruches 1 näher definierten Art. The present invention relates to a method for driving a hybrid drive of a vehicle according to the closer defined in the preamble of claim 1. Art.
Beispielsweise aus der Druckschrift DE 10 2006 012 515 A1 ist ein Kraftfahrzeug mit Hybridantrieb bekannt. Das Kraftfahrzeug umfasst zwei Antriebseinheiten zur Erzeugung des Antriebsmomentes, wobei die Antriebseinheiten sowohl gemeinsam als auch separat zur Erzeugung des Antriebsmomentes betreibbar sind. Ferner sind eine Einrichtung zur Vorgabe eines Fahrerwunsches sowie eine Steuereinheit zur Verarbeitung des Fahrerwunsches und zur Erzeugung von Steuersignalen zur Ansteuerung der Antriebseinheiten vorgesehen. For example, from the publication DE 10 2006 012 515 A1, a motor vehicle with hybrid drive is known. The motor vehicle comprises two drive units for generating the drive torque, wherein the drive units are operable both jointly and separately for generating the drive torque. Furthermore, a device for specifying a driver's request and a control unit for processing the driver's request and for generating control signals for controlling the drive units are provided.
Beispielsweise kann mit einem derartigen Parallelhybridantrieb beim so genannten Hybridfahren sowohl ein verbrennungsmotorisches Antriebsmoment als auch ein elektromotorisches Antriebsmoment genutzt werden. Wenn z. B. das elektromotorische Antriebsmoment zum Erreichen des gewünschten Antriebssollmomentes nicht ausreicht, kann zur Unterstützung zusätzlich das verbrennungsmotorische Antriebsmoment verwendet werden, um die gewünschte Fahrzeugbeschleunigung bzw. Fahrzeuggeschwindigkeit zu erreichen. Genügt hingegen das Antriebsmoment des elektrischen Antriebes, so kann rein elektrisch gefahren werden und der Verbrennungsmotor abgeschaltet werden, um Kraftstoff einzusparen und emissionsfrei zu fahren. Das Fahrerwunschmoment, welches dem Antriebsollmoment entspricht, wird aus der Fahrpedalstellung bzw. Fahrpedalposition über eine Fahrpedalkennlinie abgeleitet. Somit ergibt sich ein Fahrpedalbereich, in welchem rein elektrisch gefahren wird, wenn das Fahrerwunschmoment kleiner oder gleich als das maximal mögliche elektromotorische Antriebsmoment ist und es gibt ein Bereich, in welchem das verbrennungsmotorische Antriebsmoment zusätzlich angefordert wird, wenn das Fahrerwunschmoment größer als das maximal mögliche elektrische Antriebsmoment ist. Es hat sich bei bekannten Verfahren zum Ansteuern des Hybridantriebes gezeigt, dass der Fahrer nur einen geringen Teil des Fahrpedalbereiches nutzen kann, wenn das Fahrzeug beispielsweise in innerstädtischen Bereichen emissionsfrei gefahren werden soll. Dies deshalb, da der Verbrennungsmotor automatisch zu geschaltet wird und somit unerwünschte Emissionen erzeugt werden, sobald ein Antriebssollmoment von dem Fahrer gewählt wird, welches über dem maximal möglichen elektromotorischen Antriebsmoment liegt. For example, with such a parallel hybrid drive in so-called hybrid driving both an internal combustion engine drive torque and an electromotive drive torque can be used. If z. B. the electromotive drive torque is insufficient to achieve the desired desired drive torque, the internal combustion engine drive torque can be used to support in addition to achieve the desired vehicle acceleration or vehicle speed to support. If, on the other hand, the drive torque of the electric drive is sufficient, it is possible to drive purely electrically and switch off the internal combustion engine in order to save fuel and to drive emission-free. The driver command torque, which corresponds to the nominal drive torque, is derived from the accelerator pedal position or accelerator pedal position via an accelerator pedal characteristic. This results in an accelerator pedal area in which is driven purely electrically, when the driver's desired torque is less than or equal to the maximum possible electromotive drive torque and there is an area in which the internal combustion engine drive torque is additionally requested when the driver's desired torque is greater than the maximum possible electric Drive torque is. It has been found in known methods for driving the hybrid drive that the driver can use only a small part of the accelerator pedal area when the vehicle is to be driven without emissions, for example, in inner city areas. This is because the internal combustion engine is automatically switched to and thus unwanted emissions are generated when a desired drive torque is selected by the driver, which is above the maximum possible electric motor drive torque.
Der vorliegenden Erfindung liegt die Aufgabe zu Grunde, ein Verfahren der eingangs beschriebenen Gattung vorzuschlagen, mit dem bei Bedarf ein möglichst komfortables und emissionsfreies Fahren sichergestellt wird. The present invention is based on the object to propose a method of the type described above, with the most comfortable and emission-free driving is ensured if necessary.
Diese Aufgabe wird erfindungsgemäß durch die Merkmale des Patentanspruches 1 gelöst. Weitere vorteilhafte Ausgestaltungen ergeben sich insbesondere aus den Unteransprüchen und aus den Zeichnungen sowie der dazugehörigen Beschreibung. This object is achieved by the features of claim 1. Further advantageous embodiments will become apparent in particular from the dependent claims and from the drawings and the associated description.
Demnach wird ein Verfahren zum Ansteuern eines Hybridantriebes, zum Beispiel eines Parallelhybrides oder dergleichen, eines Fahrzeuges vorgeschlagen, bei dem zum Beispiel über eine entsprechende Ansteuereinrichtung, wie zum Beispiel einem Steuergerät oder dergleichen, ein Antriebssollmoment verbrennungsmotorisch und/oder elektromotorisch in Abhängigkeit einer Fahrpedalposition über eine hinterlegte, normale Fahrpedalkennlinie zum Antrieb des Fahrzeuges bereitgestellt wird. Um ein emissionsfreies Fahren des Fahrzeuges, also ein Fahren ohne verbrennungsmotorischen Antriebsmoment realisieren zu können, kann bei erkanntem Fahrerwunsch zum emissionsfreien Fahren die normale, ursprünglich hinterlegte Fahrpedalkennlinie derart angepasst werden, dass das maximale Antriebssollmoment dem maximal möglichen elektromotorischen Antriebsmoment entspricht. Accordingly, a method for driving a hybrid drive, for example a parallel hybrid or the like, of a vehicle is proposed, in which, for example, via a corresponding drive device, such as a control unit or the like, a drive torque desired internal combustion engine and / or electric motor in response to an accelerator pedal position over a deposited, normal accelerator characteristic is provided to drive the vehicle. In order to be able to realize emission-free driving of the vehicle, ie driving without internal combustion engine drive torque, the normal, originally stored accelerator characteristic curve can be adapted in such a way that the maximum desired drive torque corresponds to the maximum possible electromotive drive torque when the driver request for emission-free driving is recognized.
Auf diese Weise ist es möglich, dass das Fahrzeug durch die Übermittlung des Fahrerwunsches zum emissionsfreien Fahren mithilfe des erfindungsgemäßen Verfahrens ausschließlich elektrisch angetrieben wird, so dass der Verbrennungsmotor dabei abgeschaltet wird und das Fahrzeug ohne Erzeugung von Emissionen an- getrieben wird. Um dies besonders sicher und komfortabel realisieren zu können, wird die normale Fahrpedalkennlinie entsprechend angepasst, so dass die Fahrpedalstellung bzw. Fahrpedalposition entsprechend uminterpretiert wird. Beispielsweise kann die Fahrpedalkennlinie für das rein elektrische Fahren derart abgewandelt werden, dass quasi der Bereich Hybridfahren entfällt. In this way it is possible for the vehicle to be driven exclusively electrically by transmitting the driver's request for emission-free driving with the aid of the method according to the invention, so that the internal combustion engine is switched off and the vehicle is switched off without generating emissions. is driven. To realize this particularly safe and comfortable, the normal accelerator characteristic is adjusted accordingly, so that the accelerator pedal position or accelerator pedal position is reinterpreted accordingly. For example, the accelerator characteristic curve for purely electric driving can be modified in such a way that, as it were, the hybrid driving sector is eliminated.
Eine besonders einfache Ausführungsvariante der vorliegenden Erfindung kann demnach vorsehen, dass die angepasste Fahrpedalkennlinie hinsichtlich der Steigung bezogen auf die hinterlegte Fahrpedalkennlinie weitgehend unverändert bleibt, jedoch oberhalb des maximalen Antriebssollmomentes des elektrischen Antriebes quasi abgeschnitten wird, so dass das Zuschalten des verbrennungsmotorischen Antriebes auch entfällt, wenn der Fahrer eine Fahrpedalposition von bis zu 100 % wählt. Hierbei ergibt sich der Vorteil, dass das Fahrgefühl für den Fahrer, welches durch die hinterlegte Fahrpedalkennlinie erzeugt wird, beibehalten wird, da das Verhältnis zwischen Beschleunigung und Fahrpedalstellung aufgrund des unveränderten Gradienten bei der angepassten Fahrpedalkennlinie beibehalten wird. A particularly simple embodiment of the present invention can therefore provide that the adjusted accelerator characteristic with respect to the stored accelerator characteristic remains largely unchanged, but quasi cut off above the maximum drive torque of the electric drive, so that the connection of the internal combustion engine drive also omitted when the driver chooses an accelerator pedal position of up to 100%. This results in the advantage that the driving experience for the driver, which is generated by the stored accelerator characteristic is maintained, since the ratio between acceleration and accelerator pedal position is maintained due to the unchanged gradient in the adjusted accelerator characteristic.
Gemäß einer weiteren Ausführungsvariante der Erfindung kann auch vorgesehen sein, dass im Rahmen des vorgeschlagenen Verfahrens eine angepasste Fahrpedalkennlinie hinterlegt wird, die für das rein elektrische Fahren den gesamten Fahrpedalbereich nutzt, indem quasi eine Umskalierung durchgeführt wird. Hierbei wird bei der angepassten Fahrpedalkennlinie der Gradient im Vergleich zur ursprünglich hinterlegten Fahrpedalkennlinie derart verändert, dass einem Wert von etwa 100 % der Fahrpedalposition als maximales Antriebssollmoment das maximal mögliche elektromotorische Antriebsmoment zugeordnet wird. Somit wird das Fahrgefühl für den Fahrer mit der angepassten Fahrpedalkennlinie aufgrund des flacheren Gradienten feinfühliger, da das Verhältnis zwischen Beschleunigungsverhalten und Fahrpedalposition entsprechend verändert wird. Da der gesamte Fahrpedalbereich ausgenutzt wird, gibt es in vorteilhafter Weise keinen toten Bereich bei der Ansteuerung. According to a further embodiment variant of the invention, provision may also be made for an adapted accelerator pedal characteristic curve to be stored in the proposed method which uses the entire accelerator pedal area for purely electric driving by virtually rescaling it. In this case, in the adapted accelerator characteristic curve, the gradient is changed in comparison to the originally stored accelerator characteristic such that a value of about 100% of the accelerator pedal position is assigned the maximum possible electromotive drive torque as the maximum desired drive torque. Thus, the driving feeling for the driver with the adjusted accelerator characteristic becomes more sensitive due to the shallower gradient, since the ratio between acceleration behavior and accelerator pedal position is changed accordingly. Since the entire accelerator pedal area is utilized, there is advantageously no dead area in the control.
Die vorliegende Erfindung wird anhand der Zeichnungen weiter erläutert. Es zeigen: Figur 1 ein Diagramm mit einem Verlauf des Antriebssollmomentes über die Fahrpedalposition gemäß einer ersten Ausführungsvariante eines erfindungsgemäßen Verfahrens zum Ansteuern eines Hybridantriebes eines Fahrzeuges; The present invention will be further explained with reference to the drawings. Show it: 1 shows a diagram with a profile of the desired drive torque on the accelerator pedal position according to a first embodiment of a method according to the invention for driving a hybrid drive of a vehicle;
Figur 2 ein Diagramm mit einem Verlauf des Antriebssollmomentes über die Figure 2 is a diagram with a course of the drive torque across the
Fahrpedalposition gemäß einer zweiten Ausführungsvariante des erfindungsgemäßen Verfahrens.  Accelerator pedal position according to a second embodiment of the method according to the invention.
In den Figuren 1 und 2 sind Diagramme mit beispielhaft dargestellten ange- passten Fahrpedalkennlinien I und II dargestellt, die im Rahmen des erfindungsgemäßen Verfahrens zum Ansteuern eines Hybridantriebes eines Fahrzeuges zum Einsatz kommen. FIGS. 1 and 2 show diagrams with adapted accelerator characteristic curves I and II shown by way of example, which are used in the context of the method according to the invention for driving a hybrid drive of a vehicle.
Bei Hybridantrieben besteht die Möglichkeit sowohl verbrennungsmotorisch als auch elektromotorisch sowie auch in Kombination mit beiden Antrieben ein Fahrzeug anzutreiben. Da in der Regel bei nicht ausreichendem elektrischem Antriebsmoment der Verbrennungsmotor zugeschaltet wird, können beispielsweise Bereiche von Fahrzeugen nicht befahren werden, in denen eine so genannte Null-Emissionszone vorgegeben ist. Denn sobald eine vorbestimmte Fahrpedalposition FP überschritten wird, wird bei bekannten Ansteuerverfahren der Verbrennungsmotor zugeschaltet. In hybrid drives, there is the possibility of both a combustion engine and electric motor, as well as in combination with both drives to drive a vehicle. Since the internal combustion engine is usually switched on when there is insufficient electric drive torque, areas of vehicles in which a so-called zero-emission zone is predetermined can not be traveled. For as soon as a predetermined accelerator pedal position FP is exceeded, the internal combustion engine is switched on in known driving method.
Der in den Figuren angedeutete Fahrpedalbereich liegt zwischen der nicht betätigten Fahrpedalposition FP, dies entspricht dem Wert 0%, und der vollständig betätigten Fahrpedalposition FP, dies entspricht dem Wert 100%. The indicated in the figures accelerator pedal area is between the non-actuated accelerator pedal position FP, this corresponds to the value 0%, and the fully actuated accelerator pedal position FP, this corresponds to the value 100%.
Erfindungsgemäß ist nun vorgesehen, dass bei erkanntem Fahrerwunsch zum emissionsfreien Fahren die Fahrpedalkennlinie derart angepasst wird, dass das maximale Antriebssollmoment Tson-max dem maximalen elektromotorischen Antriebsmoment TE-max entspricht. Die Übermittlung des Fahrerwunsches kann zum Beispiel automatisch oder manuell über einen Schalter oder dergleichen erfolgen, so dass dann ausschließlich rein elektrisch gefahren wird, so dass ein emissionsfreier Antrieb realisiert wird, da der Bereich Hybridfahren entfällt. According to the invention it is now provided that when detected driver's request for emission-free driving, the accelerator pedal characteristic curve is adapted such that the maximum target drive torque T corresponds to n-max the maximum electric motor drive torque T E -max. The transmission of the driver's request can for example be done automatically or manually via a switch or the like, so then is driven purely electrically, so that an emission-free drive is realized, since the area hybrid driving is eliminated.
In Figur 1 ist der Verlauf des Antriebssollmomentes Tson über die Fahrpedalposition FP gemäß einer angepassten Fahrpedalkennlinie I im Rahmen einer ersten Ausführungsvariante des Verfahrens dargestellt. Hierbei bleibt die angepasste Fahrpedalkennlinie bezogen auf die ursprünglich hinterlegte Fahrpedalkennlinie bezüglich der Steigung bzw. des Gradienten unverändert, wobei oberhalb des maximalen Momentes des elektrischen Antriebs keine weitere Erhöhung des Antriebssollmomentes Tson zugelassen wird, so dass beispielsweise bei einem Wert von 60 % der Fahrpedalposition FP das maximale Antriebssollmoment Tson-max erreicht wird und somit dem maximalen elektrischen Antriebssollmoment TE-max entspricht. Somit bleibt das maximale Antriebssollmoment Tson-max ab einem Wert von etwa 60 % der Fahrpedalposition FP bis zum Wert von 100 % der Fahrpedalposition FP konstant. FIG. 1 shows the profile of the desired drive torque T so n via the accelerator pedal position FP according to an adapted accelerator characteristic I within the scope of a first embodiment variant of the method. Here, the adjusted accelerator characteristic with respect to the originally stored accelerator characteristic with respect to the gradient or the gradient remains unchanged, above the maximum torque of the electric drive no further increase of the drive torque Tson is allowed, so that, for example, at a value of 60% of the accelerator pedal position FP maximum drive desired torque T so n-max is reached and thus corresponds to the maximum electric drive desired torque T E - m ax. Thus, the maximum drive desired torque T so n-max remains constant from a value of about 60% of the accelerator pedal position FP to the value of 100% of the accelerator pedal position FP.
In Figur 2 ist eine weitere angepasste Fahrpedalkennlinie II im Rahmen einer zweiten Ausführungsvariante des erfindungsgemäßen Verfahrens dargestellt, bei der der Gradient beziehungsweise die Steigung der angepassten Fahrpedalkennlinie II im Vergleich zur ursprünglich hinterlegten Fahrpedalkennlinie derart verändert wird, dass einem Wert von etwa 100 % der Fahrpedalposition FP als maximales Antriebssollmoment Tson-max das maximale elektromotorische Antriebsmoment TE-max zugeordnet wird. Somit wird bei der angepassten Fahrpedalkennlinie II der gesamte Fahrpedalbereich für das elektrische Fahren genutzt, so dass quasi eine Art Umskalie- rung erfolgt. Da die Steigung bzw. der Gradient bei der angepassten Fahrpedalkennlinie II flacher als bei der ursprünglichen Fahrpedalkennlinie ist, wird ein feinfühligeres Fahren ohne Todbereiche über den gesamten Fahrpedalpositionsbereich ermöglicht. FIG. 2 shows a further adapted accelerator characteristic II in the context of a second variant of the method according to the invention, in which the gradient or the slope of the adapted accelerator characteristic II is changed in comparison to the originally stored accelerator characteristic such that a value of approximately 100% of the accelerator pedal position FP is assigned as the maximum drive torque Tson-max, the maximum electric motor drive torque T E - m ax. Thus, in the adapted accelerator characteristic II, the entire accelerator pedal area is used for the electric driving, so that virtually a kind of rescaling takes place. Since the slope or the gradient in the adapted accelerator characteristic II is flatter than in the original accelerator characteristic, a more sensitive driving without dead zones over the entire accelerator pedal position range is made possible.
Bei dem erfindungsgemäßen Verfahren ist vorgesehen, dass der Fahrer die Übermittlung des Fahrerwunsches zum emissionsfreien Fahren manuell über einen Schalter oder auch automatisch übermitteln kann. Ebenso kann das Beenden des emissionsfreien Fahrens manuell durch entsprechende Betätigung des Schalters zum Beispiel durch erneute Betätigung des Schalters oder auch automatisch been- det werden. Zum manuellen Übermitteln bzw. Beenden kann auch ein so genannter Kick-down-Schalter am Fahrpedal benutzt werden. In the method according to the invention it is provided that the driver can transmit the transmission of the driver's request for emission-free driving manually via a switch or automatically. Likewise, the termination of the emission-free driving can be stopped manually by corresponding actuation of the switch, for example by renewed actuation of the switch or automatically. be. For manual transmission or termination also a so-called kick-down switch on the accelerator pedal can be used.
Eine automatische Beendigung des emissionsfreien Fahrens kann beispielsweise durch fahrzeugbezogene Umstände ermittelt werden, die ein Ende des Null- Emissionsfahrens sinnvoll machen. Insbesondere kann dies der Fall sein, wenn das elektrische Antriebsmoment nicht ausreicht, um das Fahrzeug in gewünschter Weise zu beschleunigen. Dies kann zum Beispiel dadurch erkannt werden, dass die Fahrzeuggeschwindigkeit oder die Abtriebsdrehzahl trotz Volllast des elektrischen Antriebes weiter reduziert wird. In diesem Fall kann der Fahrer über ein Display oder eine Warnlampe einen Hinweis erhalten, dass das emissionsfreie Fahren automatisch beendet wird. Hierbei ist es möglich, dass das automatische Beenden erst nach einer vorbestimmten Zeitspanne erfolgt, so dass der Fahrer bei Bedarf auf den Hinweis reagieren und das automatische Beenden verhindern kann. Dies kann beispielsweise dadurch erfolgen, dass der Schalter erneut betätigt wird, so dass das emissionsfreie elektrische Fahren beibehalten wird. An automatic termination of the emission-free driving can be determined, for example, by vehicle-related circumstances that make an end to the zero-emission driving meaningful. In particular, this may be the case when the electric drive torque is insufficient to accelerate the vehicle in the desired manner. This can be recognized, for example, by further reducing the vehicle speed or the output speed despite the full load of the electric drive. In this case, the driver can be informed via a display or a warning lamp that the emission-free driving is automatically ended. In this case, it is possible for the automatic termination to take place only after a predetermined period of time, so that the driver can react to the indication as needed and prevent automatic termination. This can for example be done by the switch is operated again, so that the emission-free electric driving is maintained.
Bezuqszeichen REFERENCE CHARACTERS
Tsoii AntriebssollmomentTsoii drive torque
soii-max maximales Antriebssollmoment soii-max maximum drive torque
E-max maximales elektromotorisches Antriebsmoment E-max maximum electromotive drive torque
FP Fahrpedalposition FP accelerator pedal position
I angepasste Fahrpedalkennlinie  I adapted accelerator characteristic
II angepasste Fahrpedalkennlinie  II adapted accelerator characteristic

Claims

Patentansprüche claims
1 . Verfahren zum Ansteuern eines Hybridantriebes eines Fahrzeuges, bei dem ein Antriebssollmoment (Tson) verbrennungsmotorisch und/oder elektromotorisch in Abhängigkeit einer Fahrpedalposition (FP) über eine hinterlegte Fahrpedalkennlinie zum Antrieb des Fahrzeuges bereitgestellt wird, dadurch gekennzeichnet, dass bei erkanntem Fahrerwunsch zum emissionsfreien Fahren die Fahrpedalkennlinie (I, II) derart angepasst wird, dass das maximale Antriebssollmoment (Tson) dem maximalen elektromotorischen Antriebsmoment (TE-max) entspricht. 1 . A method for driving a hybrid drive of a vehicle, in which a desired drive torque (T so n) is provided by internal combustion engine and / or electric motor depending on an accelerator pedal position (FP) via a stored accelerator characteristic for driving the vehicle, characterized in that when detected driver request for emission-free driving the accelerator characteristic (I, II) is adjusted in such a way that the maximum nominal drive torque (T so n) corresponds to the maximum electromotive drive torque (T E - m ax).
2. Verfahren nach Anspruch 1 , dadurch gekennzeichnet, dass der Gradient der angepassten Fahrpedalkennlinie (I) dem Gradienten der ursprünglich hinterlegten Fahrpedalkennlinie entspricht, während das maximale Antriebssollmoment (Tsoii-max) bei der angepassten Fahrpedalkennlinie (I) ab einem vorbestimmten Wert der Fahrpedalposition (FP) konstant gehalten wird. 2. The method according to claim 1, characterized in that the gradient of the adjusted accelerator characteristic (I) corresponds to the gradient of the originally stored accelerator characteristic, while the maximum drive torque (Tsoii-max) in the adjusted accelerator characteristic (I) from a predetermined value of the accelerator pedal position ( FP) is kept constant.
3. Verfahren nach Anspruch 2, dadurch gekennzeichnet, dass als vorbestimmter Wert der Fahrpedalposition (FP) der Wert gewählt wird, bei dem das maximale elektromotorische Antriebsmoment (TE-max) erreicht wird. 3. The method according to claim 2, characterized in that is selected as a predetermined value of the accelerator pedal position (FP), the value at which the maximum electromotive drive torque (T E - m ax) is reached.
4. Verfahren nach Anspruch 2 oder 3, dadurch gekennzeichnet, dass das maximale elektromotorische Antriebsmoment (TE-max) bei der angepassten Fahrpedalkennlinie (I) bei einem Wert von etwa 60 % der Fahrpedalposition (FP) erreicht wird. 4. The method of claim 2 or 3, characterized in that the maximum electromotive drive torque (T E - m ax) in the adjusted accelerator characteristic (I) at a value of about 60% of the accelerator pedal position (FP) is achieved.
5. Verfahren nach einem der Ansprüche 2 bis 4, dadurch gekennzeichnet, dass das maximale Antriebssollmomentes (Tson-max) etwa zwischen Werten der Fahrpedalposition (FP) von 60 % bis 100 % konstant gewählt wird. 5. The method according to any one of claims 2 to 4, characterized in that the maximum drive desired torque (T so n-max) is approximately constant between values of the accelerator pedal position (FP) of 60% to 100%.
6. Verfahren nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, dass bei der angepassten Fahrpedalkennlinie (II) der Gradient im Vergleich zur ursprünglich hinterlegten Fahrpedalkennlinie derart verändert wird, dass einem Wert von etwa 100 % der Fahrpedalposition (FP) als maximales Antriebssollmoment (Tsoii-max) das maximale elektromotorische Antriebsmoment (TE-max) zugeordnet wird. 6. The method according to any one of the preceding claims, characterized in that in the adapted accelerator characteristic (II) the gradient compared to the originally stored accelerator characteristic is changed such that a value of about 100% of the accelerator pedal position (FP) as the maximum drive torque (Tsoii- max) the maximum electromotive drive torque (T E - m ax) is assigned.
7. Verfahren nach Anspruch 6, dadurch gekennzeichnet, dass der Gradient der angepassten Fahrpedalkennlinie (II) geringer als der Gradient der hinterlegten Fahrpedalkennlinie gewählt wird. 7. The method according to claim 6, characterized in that the gradient of the adjusted accelerator characteristic (II) is chosen to be less than the gradient of the stored accelerator characteristic.
8. Verfahren nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, dass der Fahrerwunsch zum emissionsfreien Fahren über einen Schalter manuell oder automatisch übermittelt wird. 8. The method according to any one of the preceding claims, characterized in that the driver's request for emission-free driving via a switch is transmitted manually or automatically.
9. Verfahren nach Anspruch 8, dadurch gekennzeichnet, dass die automatische Übermittlung des Fahrerwunsches zum emissionsfreien Fahren dem Fahrer angezeigt wird. 9. The method according to claim 8, characterized in that the automatic transmission of the driver's request for emission-free driving is displayed to the driver.
10. Verfahren nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, dass das emissionsfreie Fahren über einen Schalter manuell oder automatisch beendet wird. 10. The method according to any one of the preceding claims, characterized in that the emission-free driving via a switch is terminated manually or automatically.
1 1 . Verfahren nach Anspruch 10, dadurch gekennzeichnet, dass das Beenden des emissionsfreien Fahrens dem Fahrer angezeigt wird, wenn erkannt wird, dass die Fahrzeuggeschwindigkeit oder die Abtriebsdrehzahl bei Volllast des elektrischen Antriebes reduziert wird. 1 1. A method according to claim 10, characterized in that the termination of the emission-free driving is displayed to the driver when it is detected that the vehicle speed or the output speed is reduced at full load of the electric drive.
EP12727656.6A 2011-07-05 2012-06-14 Method for activating a hybrid drive of a vehicle Withdrawn EP2729339A1 (en)

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DE102011078669A DE102011078669A1 (en) 2011-07-05 2011-07-05 Method for driving a hybrid drive of a vehicle
PCT/EP2012/061302 WO2013004463A1 (en) 2011-07-05 2012-06-14 Method for activating a hybrid drive of a vehicle

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