Motor vehicles – Steering gear – With electric power assist
Reexamination Certificate
2006-05-16
2006-05-16
Hurley, Kevin (Department: 3611)
Motor vehicles
Steering gear
With electric power assist
C701S042000
Reexamination Certificate
active
07044264
ABSTRACT:
It is an object of the present invention to provide an electrical power steering system for a vehicle, in which an abnormal condition of a motor current detecting device for a motor current is detected with high precision. A power steering control unit calculates a target assist torque based on a steering signal from a steering sensor and calculates a motor driving current based on such target assist torque. The control unit then calculates a difference between a motor current in a normal condition and a detected motor current, so that the difference is used as an offset correction amount. The control unit further calculates an upper and a lower limit of the offset correction amount depending on a detected temperature of the motor current detecting device. The control unit finally determines that the motor current detecting device is not in a normal condition, when the offset amount is not within a range between the upper and lower limits of the offset correction amount.
REFERENCES:
patent: 6380706 (2002-04-01), Kifuku et al.
patent: 6860361 (2005-03-01), Takatsuka et al.
patent: 6902028 (2005-06-01), Takatsuka et al.
patent: 2005/0242760 (2005-11-01), Fujita et al.
patent: A-2002-29432 (2002-01-01), None
Denso Corporation
Hurley Kevin
Posz Law Group , PLC
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