Electric power steering apparatus with enhanced road feel

Details Electric power steering apparatus with enhanced road feel Electric power steering apparatus with enhanced road feel

1995-11-28

1998-04-14

Zanelli, Michael

Boots, shoes, and leggings

180446, 388811, 318599, B62D 504, B62D15300

Patent

active

057400407

ABSTRACT:
An electrically-operated steering apparatus in which in addition to avoiding an increase in cost caused by installing a new sensor or using a high process speed CPU, steering feels, such as steering wheel return, viscous feeling, inertial feeling and frictional feeling, are improved. In addition to assisting a static steering torque on the basis of a torque sensor, with a motor-applied voltage detection circuit capable of removing the square wave component attendant on the PWM drive of a motor, a motor angular velocity .omega. is estimated from the output data of the relevant circuit. A motor angular acceleration d.omega./dt is estimated from the motor angular velocity .omega. by using a differential calculator. The steering friction and the moment of inertia are compensated on the basis of the motor angular velocity .omega. and motor angular acceleration d.omega./dt, respectively.

REFERENCES:
patent: 5076381 (1991-12-01), Daido et al.
Patent Abstracts of Japan, No. 157 (M-1236) JP4008666 "Electric Power Steering Device".

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