Patent ID: 9284859
Filing Date: 2016-03-15
CPC Classification: F01L,F02D,Y02T

Claim Text:
1. A system for monitoring positions of an engine valve comprising: a valve guide having a central recess passing through a length of the valve guide, wherein said engine valve comprises: a valve stem having a first section with a first magnetic property adjacent to a second section with a second magnetic property, the first section and the second section having a same diameter and creating an interface between the two sections, wherein the valve stem is received by the central recess and the valve stem is allowed to move linearly through the central recess; a powered coil surrounding said valve guide recess; and a sensor coil also surrounding the valve guide recess, adjacent the powered coil, wherein the valve stem changes a coupling between the coils as it moves relative to the coils, thereby generating a signal within the sensor coil that is directly related to a position of the valve stem relative to the coils.