| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a malfunction preventing device of a motor for speed change of an automatic transmission, which prevents malfunction of the motor when the variation of a speed change ratio is small in the continuously variable automatic transmission varying the speed change ratio by means of the motor.SOLUTION: An automatic transmission comprises: a continuously variable automatic transmission which can vary a speed change ratio by varying a pulley width according to supply hydraulic pressure to a pulley; and a motor capable of varying the supply hydraulic pressure to the pulley by driving. To the above end, a malfunction preventing device of the motor for speed change of the automatic transmission comprises a motor drive means for temporarily driving the motor when a speed change ratio variation within a predetermined time is determined to be equal to or less than a predetermined variation and when a malfunction preventing flag is satisfied.</p> |
