Method for operating a drive unit for a hybrid vehicle, wherein the drive unit comprises a drive assembly (3) with an internal combustion engine (1) and an electrical machine (2) and a transmission (5) having a plurality of gearboxes (6, 7) connected between the drive assembly (3) and an output (4). The electrical machine (2) is coupled via a planetary gear unit (10) to an input shaft (8) of a first gearbox (6) and an input shaft (9) of a second gearbox (7) connected in parallel with said first gearbox (6). Therein the internal combustion engine (1) can be coupled by means of a friction-fitting decoupler (11) to the input shaft (8) of the first gearbox (6) and when the decoupler (11) is closed is coupled together with the input shaft (8) of the first gearbox (6) to the same element (15) of the planetary gear unit (10) A friction-fitting or form-fitting bypass shifting element (12) interacts with the planetary gearbox (10) in such a manner that, when the bypass shifting element (12) is engaged, a rotationally fixed connection exists between the electrical machine (2), the input shaft (8) of the first gearbox (6) and the input shaft (9) of the second gearbox (7) and thereby there is necessarily equality of rotational speed between the same, whereas when the bypass shifting element (12) is disengaged said rotationally fixed connection and said necessarily equal rotational speed for not exist. On execution of a shift under load, shortly before the engagement of an interlocking shifting element to be closed for the shift under load, the friction decoupler (11) is shifted to slipping mode in order to decouple the inertial mass of the internal combustion engine (1).


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    Title :

    Method for operating a drive unit for a hybrid vehicle


    Contributors:

    Publication date :

    2015-07-22


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    English


    Classification :

    IPC:    B60K Anordnung oder Einbau von Antriebseinheiten oder von Kraft- bzw. Drehmomentübertragungen in Fahrzeugen , ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES / B60W CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION , Gemeinsame Steuerung oder Regelung von Fahrzeug-Unteraggregaten verschiedenen Typs oder verschiedener Funktion / F16H Getriebe , GEARING



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