Method and apparatus for determining rotary position

Details Method and apparatus for determining rotary position Method and apparatus for determining rotary position

2006-09-12

2006-09-12

McCall, Eric S. (Department: 2855)

Measuring and testing

Vehicle chassis

Steering

Reexamination Certificate

active

07104119

ABSTRACT:
A system for determining the angular position of a rotating element such as an engine crankshaft. An encoder wheel is divided into a plurality of equal-angle segments, each comprising a peripheral tooth extending radially over a central angle representing an angular percentage of each segment. The total angle in each segment is a tooth dwell angle and a gap dwell angle. The ratio of the tooth dwell angle to the total segment angle is the duty cycle. A prime segment is given a first tooth dwell angle. Each segment has a unique tooth dwell angle. As the wheel rotates, a sensor begins timing at a first tooth rise and determines the time to the first tooth fall and the time to the second tooth rise. Since each duty cycle is unique, for a wheel having 45 degree segments the system can determine the segment being interrogated within 90 rotational degrees.

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