| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a vehicular steering system capable of suppressing transmission of vibrations of a steering wheel to a steering member when a vehicle is driving on a pebbled road or the like. <P>SOLUTION: A transmission ratio variable system 7 has a differential mechanism 13, which couples a first shaft 11 and a second shaft 12 so that differential rotation can be carried out, and a transmission ratio changing motor 14, which drives the differential mechanism 13. The transmission ratio changing motor 14 is subjected to feedback control so that an actual act angle θact calculated by an actual act angle calculating unit 76 is equal to a target act angle θact* calculated by a target act angle calculating unit 71. If it is determined by a disturbance determination unit 77 that disturbance has been input to the second shaft 12, a proportional gain K<SB POS="POST">P</SB>used in feedback control of a transmission ratio changing motor 14 is reduced blow a normal one. <P>COPYRIGHT: (C)2013,JPO&INPIT |
