Patent ID: 7607367

Claim:
A speed change control method for a twin clutch gear transmission which includes an even-numbered-gear-change gear transmission mechanism and an odd-numbered-gear-change gear transmission mechanism, the method comprising the steps of: selectively establishing a plurality of even-numbered gear-change gear trains in the even-numbered-gear-change gear transmission mechanism; selectively establishing a plurality of odd-numbered gear-change gear trains in the odd-numbered-gear-change gear transmission mechanism; individually changing over disconnection and connection of power transmission between a pair of clutches each of which is capable of individually changing over the disconnection and the connection of power transmission between a pair input shafts and a power source, the input shafts corresponding respectively to the even-numbered-gear-change gear transmission mechanism and the odd-numbered-gear-change gear transmission mechanism; bringing one of the clutches into a connection state; and bringing the other of the clutches into a disconnection state under a usual operation condition in which a speed change ratio is fixed, and during performing a changeover of a speed change between the even-numbered gear-change stages or between the odd-numbered-gear-change stages, when one of the even-numbered-gear-change gear transmission mechanism and the odd-numbered-gear-change gear transmission mechanism assumes a neutral state during the changeover for establishing the gear train, the clutch corresponding to the gear transmission mechanism which becomes an object of changeover for establishing the gear train out of the even-numbered-gear-change gear transmission mechanism and the odd-numbered-gear-change gear transmission mechanism is changed over to a connection state from the disconnection state and, after being disconnected again, the clutch is changed over from the disconnection state to the connection state after completing the changeover for establishing the gear train.