Arrangement for determining the travel of a piston

Details Arrangement for determining the travel of a piston Arrangement for determining the travel of a piston

1984-09-24

1986-05-13

Ciarlante, Anthony V.

Measuring and testing

Vibration

Sensing apparatus

324 61R, 324 59, 324 711, 324207, G01R 2726

Patent

active

045878501

ABSTRACT:
An arrangement for determining and measuring the position or travel of a piston in a cylinder, e.g., suspension component such as a vibration damper, gas-spring or hydropneumatic suspension, uses a structure having no moving electrical contacts, nor any movable electrical leads. The arrangement measures a variable impedance, e.g., a capacitance which is created by first and second electrodes formed within the suspension component and is distinguished in that the electrodes are fixed and are immovable with respect to each other. Capacitance variation is achieved, for example, by allowing a dielectric medium, such as a ceramic or epoxy resin cylinder to enter between two electrodes, the extent of the entry of the dielectric medium being made to be proportional to the relative travel of the piston in the cylinder. In a variation, an additional electrode forming a fixed reference capacitance with the first electrode is provided. The fixed reference capacitance is used together with the measured variable capacitance in a measuring bridge, e.g., Wheatstone bridge, so that undesirable effects of varying temperature and pressure on the capacitances inside the suspension component are compensated during measurement. By virtue of the fact that all the electrodes are fixed relative to one another, the conductive leads from the fixed electrodes can be made immovable relative to each other, whereby measurement problems owing to improper leads and connections are eliminated.

REFERENCES:
patent: 2978638 (1961-04-01), Wing et al.
patent: 3805150 (1974-04-01), Abbe
patent: 3833094 (1974-09-01), Grossman
patent: 4107975 (1978-08-01), Cargile
patent: 4206401 (1980-06-01), Meyer

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