Control system of transmission

A control system of a transmission comprising:

• an engine mounted on a vehicle;
• a transmission having a clutch formed of an engine clutch that is connected to an output shaft of the engine so as to transmit motive power of the engine to a transmission assembly portion and a transmission assembly clutch;
• and
• a clutch control unit that engages and disengages the clutch,
• wherein the clutch control unit has a clutch motor and a clutch motor controller that controls the clutch motor, and is configured to make the rotation angle of the clutch motor proportional to a stroke volume of the automatic transmission assembly clutch,
• wherein the clutch motor controller has:
• a target clutch motor current computing unit that computes a target clutch motor current for adjusting torque of the clutch motor to be torque corresponding to an operating state of the vehicle;
• and
• a motor driving and braking selection unit that selects one of a motor driving mode in which the clutch motor is driven by applying feedback control to an output of the clutch motor and a motor braking mode in which the clutch motor is braked by short-circuiting the clutch motor so as to generate braking torque in a direction opposite to the force that causes the automatic transmission assembly clutch to stroke to the disengagement side, and
• wherein, in a case where a difference between the rotation number of the engine clutch and the rotation number of the transmission assembly clutch is larger than a predetermined value in the motor braking mode, the motor driving mode is selected by the motor driving and braking unit for driving the clutch motor.