Progressively locking a friction clutch from a shift start time t1 thereby causes the friction clutch transmission torque Tfc to gradually increase from zero to a maximum value. With this, given that the transmission torque Tdc for a dog clutch is equal to the transmission input torque (motor torque Tm) minus Tfc, the transmission torque Tdc gradually decreases from the maximum value at tl. A withdrawal force Fdc = Fdc_L (a permitted upper limit value for the shift shock) is applied to the dog clutch beforehand from t2 which is a set time TMs that has passed after t1. With this, the dog clutch transmission torque Tdc which continues to decrease even after the instant t2, decreases to a torque value that corresponds to the dog clutch withdrawal force Fdc (= Fdc_L) at the instant t3 which is the time that the dog clutch 8c automatically switches from the engaged state to the disengaged state due to the withdrawal force Fdc (= Fdc_L), and with the progressive locking of the friction clutch, shifting is completed. Therefore, there is not time when the dog clutch and the friction clutch are both in a released state; therefore the automatic transmission is not in a neutral state during shifting, and it is possible to prevent a deterioration in shift quality.


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    Title :

    SHIFT CONTROL DEVICE FOR AUTOMATIC TRANSMISSION


    Additional title:

    VERSCHIEBUNGSSTEUERUNGSVORRICHTUNG FÜR EIN AUTOMATIKGETRIEBE
    DISPOSITIF DE COMMANDE DE CHANGEMENT POUR TRANSMISSION AUTOMATIQUE


    Contributors:

    Publication date :

    2015-12-09


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    English


    Classification :

    IPC:    F16H Getriebe , GEARING / B60K Anordnung oder Einbau von Antriebseinheiten oder von Kraft- bzw. Drehmomentübertragungen in Fahrzeugen , ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES / F16D COUPLINGS FOR TRANSMITTING ROTATION , Nicht schaltbare Kupplungen



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