초록 ▼

A twin-clutch transmission has first and second transmission input shafts and a transmission output shaft, each input shaft having an associated friction clutch. In the initial state, the first clutch transmits engine torque in a state of static friction and the second clutch is open. In a shifting

A twin-clutch transmission has first and second transmission input shafts and a transmission output shaft, each input shaft having an associated friction clutch. In the initial state, the first clutch transmits engine torque in a state of static friction and the second clutch is open. In a shifting operation the second transmission input shaft is brought to a synchronous speed, thus permitting the engagement of a selected gear. In order to prevent a condition in which both clutches are in static friction engagement, which would result in locking up of the transmission, the speed of at least one clutch is maintained in the range of sliding friction to a value in the vicinity of the synchronization speed until the torque to be transmitted has been transferred steadily from the first clutch to the second clutch. A synchronizer is used when shifting up in the overrun condition.

대표청구항 ▼

[ We claim:] [1.] A method for shifting a twin-clutch transmission having first and second transmission input shafts and a transmission output shaft, the input shafts having associated first and second clutches, respectively, in which the first clutch initially transmits engine torque in a state of

[ We claim:] [1.] A method for shifting a twin-clutch transmission having first and second transmission input shafts and a transmission output shaft, the input shafts having associated first and second clutches, respectively, in which the first clutch initially transmits engine torque in a state of static friction and the second clutch is initially open, comprising;bringing the second transmission shaft to a synchronous speed with a selected gear to be engaged and engaging the selected gear;opening the first clutch in a regulated manner using a slip controller so that, at a desired speed of the engine side of the first clutch, the clutch operates at a slip limit,closing the second clutch in a controlled manner until the first clutch, which is being operated at the slip limit by the slip controller, no longer transmits any torque,fully opening the first clutch so that the second clutch transmits the engine power by itself; anddisengaging the initial gear essentially without loss of torque;wherein the speed of the second transmission input shaft is changed with the aid of a synchronizer to the appropriate synchronous speed; andwherein the synchronizer takes torque required to accelerate the second transmission input shaft from the transmission output shaft.