Electricity: motive power systems – Constant motor current – load and/or torque control
Reexamination Certificate
2005-10-27
2008-09-09
Donovan, Lincoln (Department: 2837)
Electricity: motive power systems
Constant motor current, load and/or torque control
C318S434000
Reexamination Certificate
active
07423397
ABSTRACT:
An electric power steering device to control a motor based on steering torque generated in a steering shaft and supply an auxiliary steering force conforming to the steering torque to the steering system. The device judges the state wherein the command current value computed based on steering torque and the motor terminal voltage estimated based on a motor rotation number are deemed to be zero and, when the said state is judged, corrects the offset error of a motor current detecting circuit so that the actual motor terminal voltage is equal to zero. It is possible to prevent the auxiliary steering force based on offset error from being supplied to a steering system and eliminate the variation of steering torque.
REFERENCES:
patent: 6972537 (2005-12-01), Nagase
patent: 3-186477 (1991-08-01), None
patent: 8-175405 (1996-07-01), None
Glass Erick
NSK Steering Systems Co., Ltd.
Sidley Austin LLP
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