CONTROL DEVICE FOR AUTOMATIC TRANSMISSION AND CONTROL METHOD FOR AUTOMATIC TRANSMISSION

摘要

The present invention relates to a control device (12) of a transmission (20, 30) which has an auxiliary transmission mechanism (30), the control device determining that the auxiliary transmission mechanism is in a neutral state if a first condition that an actual transmission ratio of the auxiliary transmission mechanism is outside a first normal detection range is satisfied and a second condition that an input-output rotational speed difference of the auxiliary transmission mechanism is outside a second normal detection range is also satisfied. The present invention further relates to a control device of a transmission which has an auxiliary transmission mechanism, the control device determining that the auxiliary transmission mechanism is in a neutral state if either a third condition that the vehicle speed is higher than a set vehicle speed and an input-output rotational speed ratio of the auxiliary transmission mechanism is outside a first normal detection range or a fourth condition that the vehicle speed is lower than a set vehicle speed and the input-output rotational speed difference of the auxiliary transmission mechanism is outside a second normal detection range is satisfied. The present invention further relates to: a control method in which determination of being in a neutral state is performed on the basis of the first condition and the second condition; and a control method in which determination of being in a neutral state is performed on the basis of the third condition and the fourth condition.