Electromagnetic servo device for electric power steering systems

Details Electromagnetic servo device for electric power steering systems Electromagnetic servo device for electric power steering systems

1985-09-09

1987-08-18

Shoop, Jr., William M.

Electricity: motive power systems

Constant motor current, load and/or torque control

318489, 318624, 180 628, 180 644, G05B 1110

Patent

active

046879765

ABSTRACT:
An electromagnetic servo device for electric power steering system for vehicles including a driving control circuit (100) adapted to generate a torque magnitude signal (Sa) and a torque direction signal (Sdr, Sdl), based on an output signal (VR, VL) from a torque detection mechanism (11) for detecting steering torque (Ti) acting on an input shaft (1) connected to a steering wheel and an output signal (Vf) from a vehicle speed detection mechanism (50), and to feed, to an electric motor (18) for applying auxiliary torque to an output shaft (4) operatively interconnected with a steered wheel, an armature current (Io) of such a magnitude and in such a direction of conduction as desirous in accordance with both the torque magnitude signal (Sa) and the torque direction signal (Sdr, Sdl), and a dead zone (2K.sub.1 or Dl, Dm, Dh) set for the torque magnitude signal (Sa), wherein the dead zone (2K.sub.1 or Dl, Dm, Dh) of the torque magnitude signal (Sa) has a band width thereof widened with increase of the vehicle speed, in accordance with the output signal (Vf) from the vehicle speed detecting mechanism (50).

REFERENCES:
patent: 2754465 (1956-07-01), Brier
patent: 4415054 (1983-11-01), Drutchas
patent: 4522278 (1985-06-01), Kitagawa et al.

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