Patent ID: 6289072
Filing Date: 2001-09-11
Classification: G01P

Abstract:
A method of periodically updating an indicated speed of a movable part based on pulses produced by a speed sensor in response to movement of the part, the method comprising the steps of:updating the indicated speed in accordance with a first methodology if one or more pulses were produced by said sensor since a previous updating of the indicated speed, wherein a speed is computed based on a count of the produced pulses and a time interval spanning the production of the counted pulses, and the indicated speed is updated in accordance with the computed speed; andupdating the indicated speed in accordance with a second methodology if no pulses were produced by said sensor since a previous updating of the indicated speed, wherein a speed bound is computed based on a no-pulse interval during which no pulses have been produced, assuming that a pulse is produced when said speed bound is computed, and the indicated speed is updated in accordance with the lower of the computed speed bound and the indicated speed as previously updated.