Patent ID: 6289294
Filing Date: 2001-09-11
Classification: F02D,G01D,G01P

Abstract:
A method for determining rotational data from a random pulse pair generated by an encoder device, the encoder device being used to monitor the rotation of a rotating member, comprising the steps of:receiving a plurality of pulses from said encoder device, such that each of said plurality of pulses being indicative of a rotational distance that has been traveled by said rotating member;storing a time value for each of said plurality of pulses that has occurred during the two most recent revolutions of the rotating member;identifying a first pulse and a second pulse, said first and second pulse having occurred in the most recent revolution of the rotating member;retrieving a first time value for the first pulse corresponding to when the first pulse occurred during the most recent revolution of the rotating member;retrieving a second time value for the second pulse corresponding to when the second pulse occurred during the second most recent revolution of the rotating member; andcomputing a time difference between said first pulse and said second pulse by subtracting the second time value from the first time value; andusing said time difference to determine a rotational speed for the rotating member, thereby determining rotational data from the random pulse pair.