Patent ID: 6130928
Filing Date: 2000-10-10
Classification: G01P

Abstract:
A method of processing acceleration of a rotating toothed element having a predetermined number of teeth comprising:determining a first number of teeth to count;counting the first number of teeth as a first tooth count;storing the first tooth count and a first number of clock cycles representing a first time period determined from counting the first tooth count;accumulating the first tooth count and the first number of clock cycles until at least a first revolution has been completed;determining a number of teeth to discard to establish a second tooth count;discarding a portion of the first tooth count equal to the second tooth count;counting the second tooth count and a second number of clock cycles representing a second time period determined from counting the second tooth count to establish a second revolution;accumulating the second tooth count and the second number of clock cycles minus the discarded portion of the first tooth count and the first number of clock cycles to determine at least a second revolution;calculating velocity for the first revolution and for the second revolution;comparing the velocities of the first and second revolutions to determine an acceleration of the rotating toothed element;determining if the first time period falls within a time period range; andchanging the number of teeth to count if the first time period does not fall within the time period range.