Speed change control method for twin clutch type gear transmission

Abstract

[Problem] In a twin clutch type gear transmission which includes a pair of clutches which is capable of individually changing over the disconnection and the connection of power transmission between input shafts which an even-numbered-gear-change gear transmission mechanism and an odd-numbered-gear-change gear transmission mechanism include respectively and a power source, the present invention enhances the speed change responsiveness, facilitates a speed change control, and alleviates a speed change shock by suppressing a friction loss in a usual operation condition. [Means for Resolution] One of both clutches 34, 35 is brought into a connection state and the other is brought into a disconnection state under a usual operation condition in which a speed change ratio is fixed, and in performing the changeover of the speed change ratio between the even-numbered gear-change stages or between the odd-numbered-gear-change stages, when one of an even-numbered-gear-change gear transmission mechanism 16 and an odd-numbered-gear-change gear transmission mechanism 17 assumes a neutral state in the midst of the changeover of the establishment of the gear train, the clutch corresponding to the gear transmission mechanism which becomes an object of changeover for establishment of the gear train out of both gear transmission mechanisms 17 and 16 is changed over to a connection state from a disconnection state and, after being disconnected again, the clutch is changed over from a disconnection state to a connection state after completion of the changeover for establishing the gear train.