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US 4,513,782 AGranted
Electrohydraulic servovalve device
AssigneesThomson-CSF, Moog S.A.R.L.
InventorsGiulio Contartese, Joachim Dietz
Life of this patent
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Abstract
A servovalve device assembly is provided with an electronic matching circuit positioned upstream of the servovalve. The matching circuit supplies electric control signals whose purpose is to modify the hydraulic flowrate response curve of the servovalve as a function of the electrical control signal, so as to make it substantially identical to an ideal desired response curve.
Claims8
An electrohydraulic servovalve assembly comprising:
- a hydraulic servovalve providing a hydraulic response as a function of a degree of opening of said servovalve;
- electric servovalve control means responsive to an electric control signal for controlling said degree of opening of said servovalve as a function of the magnitude and sense of said electric control signal, whereby a degree of opening of said servovalve in response to control signals of given magnitudes over the entire range of opening positions of said servovalve defines an actual response curve for said hydraulic response;
- sensor means for sensing an actual servovalve hydraulic response in said actual response curve and outputting an actual response signal;
- input means for providing an input signal corresponding to a desired servovalve response;
- and
- electric matching means preprogrammed with an ideal response curve of said hydraulic servovalve and receiving said input and actual response signals, said matching means being constructed so as to output a control signal to said control means of such a sense and magnitude that said actual response curve substantially matches said ideal response curve over said entire actual response for any actual response curve.
3 more elements
Dependencies are inferred from the claim text.