×

Methods for determining the direction of rotation of rotating bodies

  • US 7,487,670 B2
  • Filed: 04/19/2006
  • Issued: 02/10/2009
  • Est. Priority Date: 04/19/2005
  • Status: Active Grant
First Claim
Patent Images

1. A method for determining a direction of rotation of a rotating body about an axis of rotation, which comprises the steps of:

  • measuring two acceleration signals x and y with at least one acceleration sensor resulting in measured acceleration signals x and y, the two acceleration signals x and y being at a 90 degree angle to each other and oriented not parallel to the axis of rotation, and both a centrifugal acceleration generated by a circular movement and a gravitational acceleration g being taken into account;

    differentiating mathematically the measured acceleration signals x and y resulting in a differentiated x acceleration signal and a differentiated y acceleration signal;

    differentiating a further time at least one of the differentiated x acceleration signal and the differentiated y acceleration signal resulting in a further differentiated x acceleration signal and/or a further differentiated y acceleration signal; and

    performing at least one of;

    correlating the further differentiated x acceleration signal with the differentiated y acceleration signal for obtaining a first correlation function; and

    correlating the further differentiated y acceleration signal with the differentiated x acceleration signal for obtaining a second correlation function.

View all claims
  • 3 Assignments
Timeline View
Assignment View
    ×
    ×