Wide dynamic range shaft speed sensor

Details Wide dynamic range shaft speed sensor Wide dynamic range shaft speed sensor

G - Physics

01

P

354/32

G01P 3/48 (2006.01) G05B 9/03 (2006.01)

Patent

CA 1187183

WIDE DYNAMIC RANGE SHIFT SPEED SENSOR ABSTRACT OF THE DISCLOSURE A digital shaft speed sensor modifies a clock frequency and counting period to provide a speed signal having wide dynamic range with adequate resolution. The division ratio of a programmable divider counting pulses from a shaft encoder is modified by a central processing unit based on the count or speed measured in a preceding counting. The output of the programmable divider sets an interval during which clock pulses are counted to determine the shaft speed. Since the dividing ratio of the programmable divider is dynamically changed according to previous speed measurements, the total number of clock pulses is correspondingly changed. In addition, the output frequency of the clock pulses is changed so that, at low speed, a low clock frequency can be used and at higher speeds, one or more higher clock frequencies can be used to maintain resolution with register memory

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