Electricity: motive power systems – Positional servo systems – With protective or reliability increasing features
Reexamination Certificate
2006-02-21
2006-02-21
Ro, Bentsu (Department: 2837)
Electricity: motive power systems
Positional servo systems
With protective or reliability increasing features
C318S568240, C388S903000
Reexamination Certificate
active
07002313
ABSTRACT:
An object of the present invention is to provide a controller for an electric power steering apparatus which has a function capable of detecting abnormality of motor current detection circuits even while a steering operation is being executed and can execute alternate control when a failure is detected. This object is achieved by a controller for an electric power steering apparatus for controlling a motor so that a steeling assist power is applied to a steering mechanism based on a current command value calculated from a steering assist command value calculated based on a steering torque, which is generated in a steering shaft, and from a motor current detection value. The controller has a function for determining a failure of a plurality of motor current detection circuits by detecting a current flowing in the motor by a single current detecting resistor, inputting the detected signal to the of motor current detection circuits in parallel, and comparing outputs from the motor current detection circuits.
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NSK Ltd.
Ro Bentsu
Sughrue & Mion, PLLC
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