Electric power steering apparatus

Details Electric power steering apparatus Electric power steering apparatus

2006-08-08

2006-08-08

Hurley, Kevin (Department: 3611)

Motor vehicles

Steering gear

With electric power assist

C701S042000

Reexamination Certificate

active

07086496

ABSTRACT:
The invention provides an electric power steering apparatus in which a dead zone is not generated even at a low duty ratio while slow starting a switching element. When a duty ratio of a PWM control becomes more than a preset value (NO in S14), a switching cycle is set to a predetermined value (a fixed value) (S20). When the duty ratio becomes equal to or less than the preset value (Yes in S14), the switching cycle is made longer than the predetermined value (S16). It is possible to securely apply a current to a motor and it is possible to prevent a dead zone from being generated, by elongating the switching cycle even in a low duty ratio while slow starting an FET and preventing a noise from being generated.

REFERENCES:
patent: 6211681 (2001-04-01), Kagawa et al.
patent: 6388405 (2002-05-01), Laurent
patent: 6877584 (2005-04-01), Jonokuchi et al.
patent: 2003/0111291 (2003-06-01), Jonokuchi et al.
patent: 0 189 172 (1986-07-01), None
patent: WO 02/054575 (2002-07-01), None
Patent Abstracts of Japan, JP 2003-011834, Jan. 15, 2003.
Patent Abstracts of Japan, JP 06-038301, Feb. 10, 1994.
Patent Abstracts of Japan, JP 06-141587, May 20, 1994.
Patent Abstracts of Japan, JP 58-172984, Oct. 11, 1983.

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