Electric power steering apparatus

Details Electric power steering apparatus Electric power steering apparatus

2011-03-29

2011-03-29

Dickson, Paul N (Department: 3611)

Motor vehicles

Steering gear

With electric power assist

C180S443000

Reexamination Certificate

active

07913805

ABSTRACT:
A rotational angle sensor used in an electric power steering apparatus detects a rotational angle of a motor shaft at a portion on a steering system side, as a motor rotational angle (θm). A MPU sets a base correction amount (Δθ′m) based on a q-axis actual current value (Iq). The MPU sets a rotational angle correction amount (Δθm) used to correct the motor rotational angle (θm) by decreasing the base correction amount (Δθ′m) as a rotational angular speed (ω) increases and by increasing the base correction amount (Δθ′m) as a torque differential value (dT/dt) increases.

REFERENCES:
patent: 7845459 (2010-12-01), Kasai
patent: 2003/0106738 (2003-06-01), Yoneda et al.
patent: 2005/0071061 (2005-03-01), Kato et al.
patent: 2006/0086560 (2006-04-01), Furusho et al.
patent: 2008/0277191 (2008-11-01), Kasai
patent: 2009/0192665 (2009-07-01), Nozawa
patent: 2 052 947 (2009-04-01), None
patent: A-2004-336913 (2004-11-01), None
patent: A-2006-151360 (2006-06-01), None
European Search Report issued May 26, 2010 in European Patent Application No. 10 15 1179.

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