Control device and method for engine and transmission

A control device for an engine and a transmission, comprising:

• a driving mechanism that controls at least one of an intake valve and an exhaust valve so as to be opened and be closed without a torque from an output shaft of the engine;
• a transmitting mechanism provided between the transmission and the engine;
• and
• a controller that reduces or interrupts a torque transmitted by the transmitting mechanism during an upshift, performing a rotation reduction control for controlling the driving mechanism so as to reduce an engine speed while the torque transmitted by the transmitting mechanism is reduced or interrupted, and controls, when the engine speed becomes a target engine speed that is higher than a first engine speed according to the gear ratio after the upshift, the driving mechanism so that the engine speed becomes the first engine speed according to the gear ratio after the upshift while increasing the torque transmitted by the transmitting mechanism during the upshift.