| 摘要 |
An electrically actuated shifting mechanism (10) includes a reversible rail select electric motor (34) and a reversible in-gear electric motor (36). Three groups of switches (64, 66, 68) are provided to effect one-at-a-time operation of the motors (34, 36) with a center group of switches (66) being used to effect operation of either the rail select or the in-gear motor and to determine the direction of operation of the motor. In one embodiment of the invention, the motor control circuitry also controls the operation of a main clutch motork (168). Four groups of switches (64a, 66a, 68a, 166) are used to effect operation of the in-gear, rail select and clutch motors (34a, 36a, 168) in desired directions. Pulse width modulation (128a) is used to effect simultaneous and out-of-phase operation of the in-gear and main clutch motors. |
