| 摘要 |
A variable transmission-ratio steering apparatus comprises an input shaft coupled to a steering wheel, an output shaft operatively coupled to steerable road wheels. The apparatus comprises an electric motor varying a rotation angle of the output shaft by providing a drive force to the output shaft, the drive force being decided based on a rotation angle of the input shaft, a lock member locking the input shaft to the output shaft in an unlockable manner, and an excitation coil enabling the lock member to be actuated to unlock a lock between the input and output shafts. The apparatus further comprises a unit controlling current to be supplied to the excitation coil and a unit detecting abnormality of the excitation coil based on both of a command value of current to flow through the excitation coil and a value of the current actually flowing through the excitation coil.
|
