Abstract: In a case where the end of a gear change has been decided by gear change end decision means for deciding if a transmission has undergone the gear change, the coil resistance value of a motor which manipulates the transmission is measured by coil resistance measurement means. The coil temperature of the motor is estimated from the measured coil resistance value of the motor by coil temperature estimation means. In a case where the estimated coil temperature of the motor has been decided to be predetermined temperature or above by high-temperature decision means, the speed change inhibition time period of the transmission is calculated by speed change inhibition time calculation means, and the speed change of the transmission is inhibited during the calculated speed change inhibition time period.

Abstract: A transmission control apparatus detects a drop in power transmission performance of a clutch actuator, and prevents a failure thereof. When power transmission performance drop detecting means detects a drop in power transmission performance of a first clutch even if a power transmission instruction is given to a first clutch actuator, power transmission in a power transmission path through a first geared transmission mechanism is inhibited, and power transmission in a power transmission path through a second geared transmission mechanism is carried out. When the power transmission performance drop detecting means detects a drop in power transmission performance of a second clutch even if the power transmission instruction is given to a second clutch actuator, power transmission in the power transmission path through the second geared transmission mechanism is inhibited, and power transmission in the power transmission path through the first geared transmission mechanism is carried out.

Abstract: A clutch control unit includes a clutch motor controller that controls a clutch motor. 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 a motor driving mode in which the clutch motor is driven by applying feedback control on an output of the clutch motor or a motor braking mode in which the clutch motor is braked by short-circuiting the clutch motor according to a difference between the target clutch motor current and an actually detected clutch motor current. It thus becomes possible to provide a control system of a transmission that engages a clutch by a motor braking force in a manner that suits the running state of the vehicle.

Abstract: A control device of an automatic transmission includes a motor control portion to control an output of a motor that executes a control operation on a clutch control portion. The motor control portion includes a target motor current computation portion that computes a target motor current according to a desired driving state, a motor current detection portion that detects plural motor currents respectively corresponding to plural detection timings, a selection portion that selects a motor current corresponding to the desired driving state among the detected plural motor currents, and a motor driving portion that applies feedback control on an output of the motor according to a difference between the target motor current and the selected motor current. Hence, not only can the most suitable clutch control be applied for each gear-change interval at gear change, but also the comfortable feeling during the driving and the fuel efficiency can be enhanced.