HYDRAULIC CYLINDER WITH PISTON AND A MAGNETIC LAYER ON THE PISTON ROD FOR PISTON POSITION DETERMINATION

A piston rod position sensing system includes a cylinder and a piston rod arranged in the cylinder for movement with respect thereto. A magnetically hard layer is formed on the piston rod to provide a recording medium. A magnetic pattern is recorded in the magnetically hard layer. The magnetic patte...

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Bibliographic Details
Main Authors CLARK, C. BRUCE, SMITH, CHRIS, PELRINE, RONALD E, LOW, THOMAS P, ECKERLE, JOSEPH S
Format Patent
LanguageEnglish
French
German
Published 10.07.2013
Subjects
ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVEREDIN A SINGLE OTHER SUBCLASS
BASIC ELECTRIC ELEMENTS
BLASTING
DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
ELECTRICITY
ENGINEERING ELEMENTS AND UNITS
FLUID-PRESSURE ACTUATORS
FLUID-PRESSURE ACTUATORS, e.g. SERVO-MOTORS
GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVEFUNCTIONING OF MACHINES OR INSTALLATIONS
HEATING
HYDRAULICS OR PNEUMATICS IN GENERAL
INDUCTANCES
LIGHTING
MAGNETS
MEANS FOR DAMPING VIBRATION
MEASURING
MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE
MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
MECHANICAL ENGINEERING
PHYSICS
SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
SHOCK-ABSORBERS
SPRINGS
SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL
TARIFF METERING APPARATUS
TESTING
THERMAL INSULATION IN GENERAL
TRANSFORMERS
WEAPONS
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Summary:A piston rod position sensing system includes a cylinder and a piston rod arranged in the cylinder for movement with respect thereto. A magnetically hard layer is formed on the piston rod to provide a recording medium. A magnetic pattern is recorded in the magnetically hard layer. The magnetic pattern includes tracks recorded in the magnetically hard layer lengthwise of the piston rod. Each track comprises magnetically written regions used to identify a current position of the piston rod. The sensing system also includes a plurality of magnetic field sensors in greater number than the plurality of tracks. Each magnetic field sensor senses the magnetically written regions of one or more of the tracks while the piston rod is moving with respect to the cylinder and generates signals used for detecting rotation of the piston rod in response to the sensed magnetically written regions.
Bibliography:Application Number: EP20040760724