VEHICLE STEERING CONTROL SYSTEM

摘要

A vehicle steering control system has a variable transmission ratio device (20) that rotates an output shaft (18) relative to an input shaft (16) so as to change the transmission ratio, and a locking device (56) that is switched between a lock-on state in which the transmission ratio between the input shaft and the output shaft is inhibited from being changed and a lock-off state in which the transmission ratio between the input shaft and the output shaft is allowed to be changed. The variable transmission ratio device has an electric motor (26) and a speed reduction mechanism (27). The locking device inhibits the input shaft and a rotor (30) of the electric motor from rotating relative to each other when placed in the lock-on state, and allows the input shaft and the rotor to rotate relative to each other when placed in the lock-off state. ® KIPO & WIPO 2009