Magnetically coded pressure detection apparatus
AssigneeEaton Corporation
InventorsDale Arden Stretch, David Gerard Genise
Life of this patent
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Abstract
An apparatus for measuring pressure comprises a housing and an actuator pressure sealed to the housing and having a shaft. The actuator is configured to be in pressure communication with a volume of gas or liquid. Upon a change in pressure, the actuator is displaced at least partially in the axial direction. A sensor detects axial displacement of a magnetically encoded target upon the change in pressure in the volume. A device for measuring pressure in an engine cylinder comprises a valve in pressure communication with an engine cylinder. The valve stem has a magnetic coding located adjacent a sensor. Axial displacement of the stem under cylinder pressure is detected and pressure is obtained.
Claims29
An apparatus for measuring pressure comprising:
- a housing having a housing wall;
- an actuator having a shaft extending along an axial direction from a first end of the actuator to a second end of the actuator, the actuator configured to be pressure sealed to the housing wall, in pressure communication with a volume enclosed by the housing wall,
- wherein the volume includes a pressure chamber having a chamber wall comprising at least a portion of a deformable member configured to be displaced at least partially in the axial direction upon a change in pressure in the pressure chamber,
- wherein the volume has a measurable pressure adjacent the first end of the actuator,
- wherein the actuator is secured to the deformable member adjacent the first end of the actuator,
- wherein the actuator is configured to be displaced at least partially in the axial direction upon a change in pressure in the volume, and
- wherein the actuator is configured to transfer axial motion from the deformable member to the shaft;
- the shaft having a magnetically encoded target configured to be detected by a static sensor by detecting axial displacement of the magnetically encoded target relative to the static sensor upon the change in pressure in the volume.
An apparatus for measuring pressure in a cylinder of an internal combustion engine comprising:
- an engine valve having a valve head and a valve stem extending from valve head in an axial direction, the valve head having a valve face configured to be in pressure communication with an engine cylinder;
- the valve stem configured to extend through an opening in a valve guide secured to an engine block of the internal combustion engine, the valve stem having information magnetically encoded on the stem configured to be read by a magnetic coding sensor by detecting axial displacement of the valve stem resulting from deformation of the valve head under cylinder pressure, the sensor configured to provide cylinder pressure information corresponding to the detected axial displacement.
An apparatus for measuring pressure in a cylinder of an internal combustion engine comprising:
- an engine valve having a valve head and a valve stem extending from valve head in an axial direction, the valve head having a valve face configured to be in pressure communication with an engine cylinder, the valve stem configured to extend through an opening in a valve guide secured to an engine block of the internal combustion engine, the valve stem having information magnetically encoded on the stem;
- a magnetic coding sensor configured to be rigidly secured to the internal combustion engine adjacent the magnetic coding target, the sensor configured to detect axial displacement of the valve stem resulting from deformation of the valve head under cylinder pressure and provide cylinder pressure information corresponding to the detected axial displacement.
Dependencies are inferred from the claim text.