| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a shift control device for an automatic transmission, which prevents the occurrence of abnormal sound in controlling a shift rod with a motor. <P>SOLUTION: The shift control device for an automatic transmission, which carries out the shift of the shift rod 32 of the automatic transmission with a ball screw 54 and a shift motor 60 for rotating the ball screw 54, includes: a motor driver 71 for controlling the rotating speed of the shift motor 60; a sensor 66 for detecting a displacement amount of the shift rod 32 at a speed change; and a TCM 73 for controlling the motor driver 71 immediately when a detected value of the sensor is input to variably control the shift motor 60. The TCM 73 includes a control function which controls the motor driver so that the shift motor 60 moves in the shift direction with a predetermined thrust force at the start of a shift speed change and, when the detected value of the sensor 66 exceeds a predetermined threshold, controls the motor driver 71 in a direction reverse to the movement of the shift direction to shift the shift rod to a target position by braking the shift motor 60. <P>COPYRIGHT: (C)2012,JPO&INPIT</p> |
