Method to calibrate hydraulic flow valves in situ

Details Method to calibrate hydraulic flow valves in situ Method to calibrate hydraulic flow valves in situ

2007-09-04

2007-09-04

Barlow, John (Department: 2863)

Data processing: measuring, calibrating, or testing

Testing system

Of mechanical system

C702S100000, C073S001160, C073S001360, C073S195000, C073S196000, C073S197000, C073S198000

Reexamination Certificate

active

11363120

ABSTRACT:
A method for performing system characterization in situ for a system comprising a actuator controlled by a proportional controller. The system includes a quasi-linear region characterized by a slope of the system response and by a delay in the quasi-linear region of the system. The system includes at least one dead zone (DZ). The method comprises the following steps: (A) applying an input waveform U(t) to an input of the system comprising the actuator controlled by the proportional controller; (B) measuring waveform characteristics of an output waveform {dot over (X)}(t) in a relevant region of the output waveform; (C) calculating a set of parameters selected from the group consisting of: {at least one DZ; a system delay; and a slope of the system response in the quasi-linear region of said system} based on the measured waveform characteristics of the output waveform; and (D) performing the system characterization in situ by using the set of calculated parameters selected from the group consisting of: {at least one DZ; the system delay; and the slope of the system response in the quasi-linear region of the system}.

REFERENCES:
patent: 4102175 (1978-07-01), Foster
patent: 4466337 (1984-08-01), Eiler
patent: 6721674 (2004-04-01), Borzsonyi
patent: 6955072 (2005-10-01), Zarkar et al.

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