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.
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.