G - Physics – 01 – P
Patent
G - Physics
01
P
73/62
G01P 3/48 (2006.01)
Patent
CA 2003708
-24- ABSTRACT OF THE DISCLOSURE APPARATUS FOR DETERMINING THE SPEED ANGULAR POSITION AND DIRECTION OF ROTATION OF A ROTATABLE SHAFT An apparatus for use on electronically controlled fuel injection systems senses speed, angular position, and direction of rotation using only a single Hall effect type sensor. The apparatus includes a disk element fixedly connected to and rotatable with the camshaft of an internal combustion engine. The disk element includes a plurality of circumferential zones of substantially identical length with each zone having first and second areas. A first portion of these circumferential zones have first and second areas which are substantially different in length than the first and second areas of a second portion of the circumferential zones. Accordingly, the sensor delivers a signal which has a frequency directly related to the instantaneous velocity of the disk element, but varies in pulse width in response to the first and second portions of the circumferential zones. A microprocessor operating under software control detects the instantaneous angular position and direction of rotation of the disk element by locating the second portion of the circumferential zones and the order in which they are received.
Brandt Wayne D.
Luebbering Bernard L.
Caterpillar Inc.
Kirby Eades Gale Baker
LandOfFree
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