Motor vehicles – Steering gear – With electric power assist
Reexamination Certificate
2007-10-02
2007-10-02
Morris, Lesley D. (Department: 3611)
Motor vehicles
Steering gear
With electric power assist
C701S040000
Reexamination Certificate
active
11017729
ABSTRACT:
An electric power steering system includes: a first rotation detection section including a first sensor section and outputting a signal corresponding to a rotation of an input shaft; a second rotation detection section including second and third sensor sections and outputting signals corresponding to a rotation of an output shaft; and a control unit detecting the respective rotational angles of the input and output shafts and a torque applied to a torsion bar based on the output signals from these rotation detection sections, and providing a driving control of an electric motor. The control unit makes determination on the occurrence of failure at the first to third sensor sections, and provides the driving control of the electric motor as shifting the driving control, based on results of the determination, between a torque control mode using the detected value of the torque and a steering angle control mode using the detected value of the rotational angle of either one of the input and output shafts.
REFERENCES:
patent: 6364051 (2002-04-01), Kada et al.
patent: 6691820 (2004-02-01), Tokumoto
patent: 6865463 (2005-03-01), Suzuki
patent: 6889794 (2005-05-01), Higashira et al.
patent: 6948385 (2005-09-01), Tokumoto et al.
patent: 2000-185660 (2000-07-01), None
Koyo Seiko Co. Ltd.
Morris Lesley D.
Williams Maurice
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