Transmission and method of shift control for transmission

A method of shift control for transmission:

• the transmission comprising:
• a first clutch being capable of switching between a connection state being connected to a power source and a disconnection state being disconnected from the power source;
• a second clutch being capable of switching between a connection state being connected to the power source and a disconnection state being disconnected from the power source;
• a first input shaft being detachably connected to the power source by the first clutch;
• a second input shaft being detachably connected to the power source by the second clutch;
• an output shaft;
• a first change-speed mechanism being disposed between the first input shaft and the output shaft, and comprising a first gear mechanism for making a combination of a plurality of change-speed stages and a first gear-mechanism selector for selecting one of the change-speed stages;
• a second change-speed mechanism being disposed between the second input shaft and the output shaft, and comprising a second gear mechanism for making a combination of a plurality of change-speed stages and a second gear-mechanism selector for selecting one of the change-speed stages;
• a controller for controlling the first clutch, the second clutch, the first gear-mechanism selector, and the second gear-mechanism selector;
• the method comprising steps of:
• having the controller adopt a time, which one of the first and second gear-mechanism selectors requires in shifting a current change-speed stage to other change-speed stages, as a pre-shift time for selecting the latter change-speed stage;
• having the controller estimate a temporary change-speed stage from a state of vehicle after the pre-shift time, the state of vehicle being relevant to each element of an anticipated change-speed stage group that is made up of one or more of the change-speed stages that can be selected by the one of the first and second gear-mechanism selectors being set on one of the first and second input shafts that is disconnected from the power source;
• and
• having the controller operate the one of the first and second gear-mechanism selectors while adopting the temporary change-speed stage as a subsequent change-speed stage when the temporary change-speed stage coincides with an anticipated change-speed stage that corresponds to the pre-shift time.