Variable transmission-ratio steering apparatus

Details Variable transmission-ratio steering apparatus Variable transmission-ratio steering apparatus

2005-03-22

2005-03-22

Morris, Lesley D. (Department: 3611)

Motor vehicles

Steering gear

Power assist alarms or disablers

C701S041000

Reexamination Certificate

active

06868933

ABSTRACT:
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.

REFERENCES:
patent: 6718242 (2004-04-01), Mori et al.
patent: 20030201136 (2003-10-01), Ueno et al.
patent: 2001-278087 (2001-10-01), None

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