Dynamic gain adjustment in electromagnetic wave hydraulic cylinder piston position sensing

Reference Number: N 01-03

Inventors: Crayton, John W.; Lee, Eric F.; Morgan, Denny; Schumacher, Dennis L.

Owner: NISTAC

USPTO Link: 5608332

Invention Summary

A dynamic adjustment of gain, or signal processing level, is provided, in a hydraulic cylinder electromagnetic wave piston position sensing system, that continuously accommodates for service difference changes in signal level that occur as a result of items such as direction change, differences between cylinders, temperature responsiveness, static vs dynamic operation and wear over lifetime.

The dynamic adjustment is achieved by attenuating or incrementing the gain of the sensing system as needed each cycle through a comparison of a measured width parameter of the resonance signal at the piston position in relation to a previously tabulated width parameter of the resonance signal for that particular cylinder at that particular piston position.