EMI suppression for electronic engine control frequency signal inputs
AssigneeUnited Technologies Corporation
InventorsWayne R. Spock, Richard P. Meisner
Life of this patent
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Abstract
Periodic digital signal samples of redundant sensed engine RPM signals are rejected for limit exceedance of known performance values, the nonrejected digital signal samples are each compared with a synthesized RPM equivalent signal to further reject any sample which differs from the synthesized value by more than a selected difference value, one of the nonrejected samples are then used for the engine RPM indication, and in the event that both samples are rejected the synthesized value is used.
Claims4
Apparatus for use in digital electronic engine controls for selecting the best signal representation of a gas turbine engine parameter from among the sample values of two sensed signals representative of the parameter actual value, and a synthesized signal representative of the parameter nominal value, comprising:
- signal comparison means, responsive to the sampled values of each of the two sensed signals, for comparing each sample value to maximum and minimum performance value limits established for the parameter, and for rejecting those sensed signal samples which exceed these limits;
- and
- signal selection means, responsive to the nonrejected sensed signal samples from said signal comparison means
- for determining the difference signal magnitude between the sampled actual parameter value and the nominal value of the synthesized signal,
- for rejecting each previously nonrejected sensed signal sample having said difference value greater than a selected maximum,
- for selecting a nonrejected sensed signal sample as the parameter value in the presence of nonrejected samples, and
- for selecting the synthesized signal as the parameter value in the absence of nonrejected sensed signal samples.
Dependencies are inferred from the claim text.