System and method for examining relationship between intersecting encoder output signals
AssigneeLexmark International, Inc.
InventorsChristopher Alan Adkins, Lucas David Barkley, Michael Anthony Marra, III
Life of this patent
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Abstract
An encoder system may determine a plurality of intersection points for first and second encoder output signals produced by an encoder. Each intersection point may be determined by initiating a capture of sample points of each of the encoder signals and then examining the captured sample points.
Claims27
A method for determining an intersection point between first and second encoder output signals, the method comprising the steps of:
- (a) defining a capture start amplitude;
- (b) determining when an amplitude of the second encoder output signal crosses the capture start amplitude;
- (c) after step (b), initiating capture of a plurality of first sample points of the first encoder output signal and a plurality of second sample points of the second encoder output signal;
- (d) storing the captured first and second sample points;
- and
- (e) examining the stored first and second sample points to define the intersection point.
A method of examining phase and amplitude relationship between first and second encoder output signals which are out of phase and which repeatedly intersect, the method comprising the steps of:
- (a) determining an amplitude of a first intersection point between the first and second encoder output signals when the first encoder output signal is increasing and the second encoder output signal is decreasing;
- (b) determining an amplitude of a second intersection point between the first encoder output signal and all inverse of the second encoder output signal when the first encoder output signal is increasing and the second encoder output signal is increasing;
- (c) determining an amplitude of a third intersection point between the first and second encoder output signals when the first encoder output signal is decreasing and the second encoder output signal is increasing;
- (d) determining an amplitude of a fourth intersection point between the first encoder output signal and the inverse of the second encoder output signal when the first encoder output signal is decreasing and the second encoder output signal is decreasing.
An encoder signal analysis system for examining first and second encoder output signals, the system comprising:
- a controller receiving the first and second encoder output signals, the controller determining:
- (i) an amplitude of a first intersection point between the first and second encoder output signals when the first encoder output signal is increasing and the second encoder output signal is decreasing, (ii) an amplitude of a second intersection point between the first encoder output signal and an inverse of the second encoder output signal when the first encoder output signal is increasing and the second encoder output signal is increasing, (iii) an amplitude of a third intersection point between the first and second encoder output signals when the first encoder output signal is decreasing and the second encoder output signal is increasing, and (iv) an amplitude of a fourth intersection point between the first encoder output signal and the inverse of the second encoder output signal when the first encoder output signal is decreasing and the second encoder output signal is decreasing.
An encoder signal analysis system for determining a intersection point between first and second encoder output signals, the system comprising:
- a controller receiving the first and second encoder output signals, the controller including a stored capture start amplitude, the controller:
- (a) determining when an amplitude of the second encoder output signal crosses the capture start amplitude;
- (b) after step (a), initiating capture of a plurality of first sample points of the first encoder output signal and a plurality of second sample points of the second encoder output signal;
- (c) storing the captured first and second sample points;
- and (d) examining the stored first and second sample points to define the intersection point.
Dependencies are inferred from the claim text.