Electricity: motive power systems – Automatic and/or with time-delay means – Terminal voltage or counter-electromotive force of...
Patent
1993-11-23
1996-05-28
Cabeca, John W.
Electricity: motive power systems
Automatic and/or with time-delay means
Terminal voltage or counter-electromotive force of...
318432, 180446, H02P 104
Patent
active
055214754
ABSTRACT:
An electric power steering apparatus in which the steering force of a steering wheel is assisted by an electric motor is disclosed. The number of revolution of the electric motor is detected, and the counter electromotive force of the electric motor is calculated on the basis of the detected number of revolution. A voltage which is to be applied to the electric motor and corresponds to the driving current instruction value determined in accordance with the steering torque is corrected on the basis of the calculated counter electromotive force. In the electric power steering apparatus, the period of the detection of the number of revolution of the electric motor is made longer than the period of the feedback control of the driving current of the electric motor, and the period of the feedback control of the driving current of the electric motor is synchronized with the period of the correction of the voltage to be applied.
REFERENCES:
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patent: 4837692 (1989-06-01), Shimizu
patent: 4977507 (1990-12-01), Matsuoka et al.
patent: 5253725 (1993-10-01), Nishimoto
patent: 5255755 (1993-10-01), Fu
patent: 5367235 (1994-11-01), Fukudome
"Regelungstechnik" By Follinger Otto (Elitera-Verlag, Berlin (DE)) 2nd Edition 1978, pp. 18, 19, and 205.
Fu Jian-Guo
Matsuoka Hirofumi
Cabeca John W.
Koyo Seiko Co. Ltd.
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