Power steering system incorporating electric motor

Details Power steering system incorporating electric motor Power steering system incorporating electric motor

1988-03-29

1989-10-03

Marmor, Charles A.

Motor vehicles

Compensating devices

36442405, B62D 504

Patent

active

048710393

ABSTRACT:
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 reduction 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.

REFERENCES:
patent: 4471280 (1984-09-01), Stack
patent: 4653601 (1987-03-01), Nakamura et al.
patent: 4664211 (1987-05-01), Oshita et al.
patent: 4676331 (1987-06-01), Iwaki et al.
patent: 4681183 (1987-07-01), Oshita
patent: 4685528 (1987-08-01), Suzuki et al.
patent: 4708220 (1987-11-01), Noto et al.
patent: 4736810 (1988-04-01), Morishita et al.

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