Detection of change in the relative position of beta sensors to beta ring

A method for detecting relative movement of a position of a beta sensor with respect to a beta ring, comprising:

• detecting a waveform having a first period generated by the beta sensor responsive to passage of a plurality of indicators of a beta ring past the beta sensor;
• comparing the detected waveform having the first period with a reference waveform having a reference period within a controller;
• determining if the detected waveform is different from the reference waveform by a first amount within the controller, wherein the first amount indicates that one of the beta sensors has moved the first amount from a previous position with respect to the beta ring;
• and
• in response to the determining that the detected characteristic is different from the reference point by the first amount, generating a fault code indicating that the beta sensor has moved at least the first amount with respect to the beta ring.

A system for detecting relative movement of a position of beta sensors, comprising:

• a beta ring having a plurality of teeth thereon, wherein one of the plurality of teeth comprises an outlier tooth that is different from a remaining plurality of teeth;
• a beta sensor for detecting movement of the plurality of teeth past the beta sensor and generating an output function responsive thereto;
• a memory for storing a reference point for a characteristic associated with the output function;
• a controller connected to receive the output function, wherein the controller is configured to:
• detect the characteristic associated with the output function from the beta sensor generated responsive to passage of the outlier tooth of the beta ring past the beta sensor;
• compare the detected characteristic with the reference point for the characteristic associated with the output function;
• determine if the detected characteristic is different from the reference point for the characteristic by a first amount, wherein the first amount indicates that the beta sensor have moved the first amount from a previous position with respect to the beta ring;
• and
• in response to the determining that the detected characteristic is different from the reference point by the first amount, generate a fault code indicating that the beta sensor has moved at least the first amount.