Transmission control device

A transmission control device comprising:

• a driving source configured to output driving force to driving wheels mounted on a vehicle;
• a multi-speed transmission configured to change a speed of rotations caused by the driving force from the driving source and output the rotations to a driving wheel side;
• and
• a controller configured to control the speed change by the transmission so as to control shift positions of the transmission so as to switch from a current shift position to a target shift position in accordance with a vehicle speed and a driving condition, the transmission comprising:
• a first input shaft to which the driving force from the driving source is input through a first clutch;
• a second input shaft to which the driving force from the driving source is input through a second clutch;
• a plurality of drive gears configured to change a speed of the driving force input to the first input shaft or the second input shaft;
• an output shaft on which a plurality of driven gears configured to mesh with the plurality of drive gears are secured, the output shaft being configured to output the driving force changed in speed through the drive gears and the driven gears;
• a first transmission mechanism configured to selectively bring one of the drive gears on the first input shaft into synchromesh with the first input shaft;
• a second transmission mechanism configured to selectively bring one of the drive gears on the second input shaft into synchromesh with the second input shaft;
• and
• a gear operation mechanism driven by a single actuator mechanism and configured to operate a plurality of synchromesh units of the first transmission mechanism and the second transmission mechanism, the gear operation mechanism being configured to perform a selection operation for selecting one of the plurality of synchromesh units to operate and a shift operation for driving the selected synchromesh unit to an engagement position corresponding to a shift position, the gear operation mechanism comprising:
• a shift operation continuation determiner configured to determine to allow or disallow continuation of the shift operation at a change of the shift position to the target shift position;
• and
• a shift operation restrictor configured to, when the shift operation continuation determiner determines to disallow continuation of the shift operation, execute only the selection operation and prohibiting the shift operation, and configured to enable the shift operation when the shift operation continuation determiner determines to allow continuation of the shift operation.