Control method for shifting a powershift transmission
AssigneeGetrag Ford Transmissions GmbH
InventorsMarco Siebigteroth, Christian Krauss
Life of this patent
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Abstract
In a transmission during a shifting process while torque is transferred from a power-outputting clutch, which is initially in the adhered state, to a power-receiving clutch, which is initially open, the power-receiving clutch increases torque capacity in a slip region, and the power-outputting clutch decreases torque capacity during an initial phase of the transfer of torque while its torque capacity is greater than necessary to maintain its adhered state. In the final state of the transfer of torque, the power-receiving clutch transmits the entire drive torque.
Claims16
A method for transferring drive torque from a power-outputting clutch to a power-receiving clutch in a transmission having an input, an output and various gear speeds between the input and output, the method comprising the steps of:
- transmitting torque through the power-outputting clutch while the power-receiving clutch is open;
- decreasing the torque capacity of the power-outputting clutch and maintaining said torque capacity greater than the magnitude of torque transmitted by the power-outputting clutch during a first period of the torque transfer;
- increasing the torque capacity of, magnitude of torque transmitted by the power-receiving clutch during the first period;
- continuing to decrease the torque capacity of the power-outputting clutch while the power-outputting clutch operates in a slip region in which the torque capacity of the power-outputting clutch reaches the torque magnitude transmitted by the power-outputting clutch;
- increasing the torque capacity of, and magnitude of torque transmitted by the power-receiving clutch while the power-outputting clutch operates in the slip region;
- fully opening the power-outputting clutch;
- and
- transmitting torque between the input and output through the power-receiving clutch.
Dependencies are inferred from the claim text.