Patent ID: 8340876

Claim:
A controller for an automatic transmission comprising: a clutch mechanism interposed between an engine and a gear shift mechanism to transmit driving power from the engine to the gear shift mechanism; a shift motor and a select motor for executing a gear shift operation of the gear shift mechanism; a gear shift control unit for controlling the shift motor and the select motor; and a transmission controller for instructing a gear shift pattern corresponding to a driving state to the gear shift control unit, characterized in that: the gear shift control unit has a target rotational angle position calculator for calculating a target rotational angle position of the shift motor and the select motor, an actual rotational angle position calculator for calculating an actual rotational angle position of the shift motor and the select motor, and an F/B gain setting unit for setting an F/B gain in accordance with a gear shift pattern, and when a gear shift instruction from the gear shift control unit is a gear shift pattern for driving at least the select motor, the F/B gain is set to be larger than a gear shift pattern which does not drive the select motor, and also a motor driving mode and a motor braking mode are switched to each other in accordance with the difference between the target rotational angle position and the actual rotational angle position.