Detrending engine positional data for rotating position encoders
AssigneeMotorola, Inc.
InventorsMichael A. McClish, Marvin L. Lynch, Margaret A. Selfe, Gregory Steinl, Donald J. Remboski, Jr.
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Abstract
A method for detrending engine positional data includes acquiring positional encoder data over a plurality of consecutive engine revolutions as the engine is decelerating. Then, a trend (207) in the acquired positional encoder data consistent with behavior occurring at less than a frequency of one cycle per engine revolution is identified. Next, corrected positional encoder data (208) is generated dependent on removing the identified trend (207).
Claims21
A method for detrending engine position data for rotating position encoders coupled to an engine comprising the steps of:
- acquiring engine position data over a plurality of consecutive engine revolutions as the engine is decelerating;
- determining a continuously decelerating trend in the acquired engine position data consistent with behavior occurring at a frequency of less than one cycle per engine revolution;
- and
- providing corrected engine position data by eliminating the determined continuously decelerating trend from the acquired engine position data.
A method for detrending engine position data for a rotating position encoder coupled to an engine that provides position data corresponding to successively spaced position marks as an engine rotates, the method comprising the steps of:
- acquiring a multitude of continuously increasing time differences occurring between the successively spaced position marks over a plurality of consecutive engine cycles as the engine is continuously decelerating;
- determining a mean time difference for each engine cycle of the plurality of engine cycles dependent on a portion of the multitude of time differences occurring between the successively spaced position marks;
- and
- providing a corrected delta-time associated with each successively spaced position marks by eliminating a portion of the multitude of continuously increasing time differences occurring between the successively spaced position marks from the mean time difference for each engine cycle of the plurality of engine cycles.
A method for detrending profile correction factors for a rotating position encoder that provide position data corresponding to successively spaced position marks as an engine rotates, the method comprising the steps of:
- acquiring a multitude of continuously increasing time differences occurring between the successively spaced position marks over a plurality of consecutive engine revolutions as the engine is continuously decelerating;
- determining a mean time difference between successively spaced position marks for each engine revolution of the plurality of engine revolutions dependent on a portion of the multitude of continuously increasing time differences;
- and
- determining a trend line corresponding to the portion of continuously increasing time differences of the acquired multitude of time differences for each engine revolution;
- determining a difference between a magnitude represented on the trend line and a zero slope line passing through a mean time value for each of the successively spaced position marks and for each engine revolution of the plurality of consecutive engine revolutions and providing error values dependent thereon;
- and
- providing a corrected delta-time associated with each of the successively spaced position marks dependent on subtracting each of the error values from the acquired multitude of continuously increasing time differences.
An apparatus for detrending engine position data comprising:
- a sampler for acquiring an engine position data over a plurality of consecutive engine revolutions as the engine is continuously decelerating;
- and
- a signal processor for determining a continuously decelerating trend in the acquired engine position data consistent with behavior occurring at a frequency of less than one cycle per engine revolution and providing a corrected engine position data by eliminating the determined continuously decelerating trend.
Dependencies are inferred from the claim text.