Patent ID: 6510396
Filing Date: 2003-01-21
Classification: B62D,G01D,H02P

Abstract:
A method of compensating for errors in the measurement of the kinematic properties of an electric power steering motor for an automobile, the method comprising:generating a set of M-ary signals comprising a set of pulses indicative of the angular position of the motor, wherein the pulse widths of the M-ary signals comprise a fraction of a cycle of the M-ary signals; measuring the pulse width of the set of M-ary signals; measuring the time between the edges of the set of M-ary signals; and calculating a compensated value of a first kinematic property of the motor; wherein calculating the compensated value of the first kinematic property of the motor comprises calculating the compensated value of the angular velocity, &ngr;c, of the motor according to the equation &ngr;c=&thgr;s/tmeasured â€ƒwherein &thgr;s is the pulse width of the set of M-ary signals and tmeasured is the time between the edges of the set of M-ary signals.