Power-assisted steering system

Details Power-assisted steering system Power-assisted steering system

2006-05-09

2006-05-09

Morris, Lesley D. (Department: 3611)

Motor vehicles

Steering gear

With electric power assist

C180S446000, C180S444000, C701S041000, C701S042000

Reexamination Certificate

active

07040450

ABSTRACT:
A power-assisted steering system includes a current detector for detecting sequentially current flowing to a ground-side switching element in a lower arm by a detection resistor inserted into the lower arm not only in a time period when the switching element is ON but also in time period when the switching element is OFF, an offset updating unit for sequentially updating an offset correction value with detected values in the time period when the switching element is OFF, and a detected current correcting unit for calculating a motor current value (a corrected current detected value) by correcting detected values in the time period when the switching element is ON with the offset correction value thereby updating.

REFERENCES:
patent: 6148949 (2000-11-01), Kobayashi et al.
patent: 2003/0100981 (2003-05-01), Suzuki
patent: 2003/0155172 (2003-08-01), Kawada et al.
patent: 2004/0206569 (2004-10-01), Kodama et al.
patent: 2004/0222033 (2004-11-01), Kameya
patent: 2004/0267421 (2004-12-01), Eskritt et al.
patent: 8-119132 (1996-05-01), None
patent: 2847406 (1998-11-01), None

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