Control apparatus for electric power steering system

Details Control apparatus for electric power steering system Control apparatus for electric power steering system

1997-08-12

1999-01-19

Cabeca, John W.

Electricity: motive power systems

Limitation of motor load, current, torque or force

180446, 701 41, B62D 504

Patent

active

058617256

ABSTRACT:
A steering force assist command value in correspondence with a steering torque is represented by approximation function equations lower than the order of the higher order function equation. The steering torque is sampled at predetermined time intervals and the steering force assist command value in correspondence with the sampled steering torque is calculated by the approximation function equations where when data outputted from a calculation device comprise 16-bit data, upper 8-bit data is outputted to a motor drive circuit and lower 8-bit data is omitted, and the omitted lower 8-bit data is added in calculating operation of next sampling period. An error of the steering force assist command value by omission of the lower 8-bit data is reduced and steering feeling can be improved.

REFERENCES:
patent: 4509611 (1985-04-01), Kade et al.
patent: 4865148 (1989-09-01), Marumoto et al.
patent: 4972320 (1990-11-01), Sugiura et al.
patent: 5596252 (1997-01-01), Shimizu et al.
patent: 5740040 (1998-04-01), Kifuku et al.
patent: 5752209 (1998-05-01), Nishimoto et al.

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