Motor vehicles – Steering gear – With electric power assist
Reexamination Certificate
2006-07-28
2009-06-09
Dickson, Paul N (Department: 3611)
Motor vehicles
Steering gear
With electric power assist
C701S041000, C701S034000, C701S031000
Reexamination Certificate
active
07543679
ABSTRACT:
An electric power steering system includes a steering wheel, an electric assist motor operatively coupled to the steering wheel, and an electronic controller operatively coupled to the assist motor. A steering wheel position sensor provides an output indicative of an angular position of the steering wheel. A motor position sensor provides an output indicative of a relative angular position for the motor. Steering wheel position sensor output is acquired at each of a plurality of angular positions of the motor, thereby establishing a set of points defining a curvilinear relationship between steering wheel sensor output and motor position sensor output. The set of points is sampled to calculate a straight line which approximates the curvilinear relationship, thereby reducing periodic errors in the steering wheel sensor output. The straight line is employed to determine a position offset for the motor position sensor output corresponding to a system zero position. The system zero position is a position for which the vehicle will travel along a linear, substantially straight-ahead path.
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Adams Tashiana
Delphi Technologies Inc.
Dickson Paul N
Twomey Thomas N.
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