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Method for shifting a twin-clutch transmission and twin-clutch transmission arrangement

  • US 5,890,392 A
  • Filed: 07/28/1997
  • Issued: 04/06/1999
  • Est. Priority Date: 08/08/1996
  • Status: Expired due to Term
First Claim
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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; and

    disengaging 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; and

    wherein the synchronizer takes torque required to accelerate the second transmission input shaft from the transmission output shaft.

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