B - Operations – Transporting – 62 – D
Patent
B - Operations, Transporting
62
D
180/54
B62D 5/04 (2006.01)
Patent
CA 1275259
ABSTRACT OF THE DISCLOSURE A power steering system having an electric motor and including an input shaft fixed to a steering wheel, an output shaft coupled to the motor via a reduc- tion gear, and a torsion bar provided between the input and output shafts, the output shaft being rotatable by the resultant of a manual torque for rotating the wheel and the torque of the motor. The system comprises a sensor for detecting the relative angular displacement between the input shaft and the output shaft, and a microcomputer having stored therein the relationship between the relative angular displacement and the motor current target value for determining the direction of rotation of the motor and a motor current target value from the output of the sensor to produce outputs. The relationship stored in the microcomputer is a nonlinear relationship wherein variations in the motor current target value with the relative angular displacement are small in the range of small relative angular displacements but are great in the range of great displacements.
562868
Daido Toshihiko
Fujiwara Mitsugu
Nishimura Shigeo
Fetherstonhaugh & Co.
Koyo Seiko Co. Ltd.
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