Methods and apparatus for an active front steering actuator

Details Methods and apparatus for an active front steering actuator Methods and apparatus for an active front steering actuator

2006-11-17

2008-09-02

Arani, Taghi T. (Department: 4193)

Electricity: motive power systems

Positional servo systems

'reset' systems

C318S560000, C318S609000, C318S590000

Reexamination Certificate

active

07420350

ABSTRACT:
An active front steering system includes a motor controller configured to compute a position error from a commanded position value and an actual position value, and then enter one of two modes—a commutation enable mode and a commutation freeze mode—depending upon the value of this position error. The commutation freeze mode applies when the absolute value of the position error is less than a predetermined threshold, and involves sending a set of signals to the motor's phase inputs such that commutation of the motor is prevented and a substantially constant motor hold torque is produced. The commutation enable mode applies when the absolute value of the position error is greater than or equal to the predetermined threshold, and corresponds to normal commutating operating mode.

REFERENCES:
patent: 6731085 (2004-05-01), Sardar et al.
patent: 7187153 (2007-03-01), Imagawa et al.
patent: 7298109 (2007-11-01), Sakamaki et al.
patent: 2006/0145652 (2006-07-01), Ta et al.

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