Power plants – Pressure fluid source and motor – Control by independently operated punch card – tape – digital...
Reexamination Certificate
2005-10-04
2005-10-04
Lazo, Thomas E. (Department: 3745)
Power plants
Pressure fluid source and motor
Control by independently operated punch card, tape, digital...
C060S460000, C091S361000, C091S459000
Reexamination Certificate
active
06951102
ABSTRACT:
A hydraulic circuit branch includes a hydraulic actuator, such as a cylinder, and an assembly of one or more electrohydraulic proportional valves connected in series between a pressurized fluid supply line and a tank return line. The force acting on the hydraulic actuator is determined by sensing fluid pressures produced by the hydraulic actuator. Pressures in the supply and tank return lines also are sensed. The sensed pressures and a desired velocity for the hydraulic actuator are employed to determine an equivalent flow coefficient, which characterizes fluid flow through the hydraulic circuit branch, either a conduction or restriction coefficient may be derived. The equivalent flow coefficient is used to determine how to activate each electrohydraulic proportional valve to achieve the desired velocity of the hydraulic actuator. The equivalent flow coefficient also is employed to control the pressure levels in the supply and tank return lines.
REFERENCES:
patent: 3954046 (1976-05-01), Stillhard
patent: 4061155 (1977-12-01), Sopha
patent: 4250794 (1981-02-01), Haak et al.
patent: 4437385 (1984-03-01), Kramer et al.
patent: 5138838 (1992-08-01), Crosser
patent: 5201177 (1993-04-01), Kim
patent: 5249140 (1993-09-01), Kessler
patent: 5261234 (1993-11-01), Holloway et al.
patent: 5490384 (1996-02-01), Lunzman
patent: 5666806 (1997-09-01), Dietz
patent: 5701793 (1997-12-01), Gardner et al.
patent: 5784945 (1998-07-01), Krone et al.
patent: 5878647 (1999-03-01), Wilke et al.
patent: 5947140 (1999-09-01), Aardema et al.
patent: 5960695 (1999-10-01), Aardema et al.
patent: 6282891 (2001-09-01), Rockwood
patent: 6467264 (2002-10-01), Stephenson et al.
patent: 6609369 (2003-08-01), Koehler et al.
patent: 0 796 952 (1997-09-01), None
patent: 796952 (1997-09-01), None
Arene Jansson, et al., “Separate Controls of Meter-in and Meter-out Orifices in Mobile Hyraulic Systems,” SAE Technical Papers Series, Sep. 1999, pp. 1-7, SAE International, Warrendale, PA.
Haas George E.
Husco International Inc.
Lazo Thomas E.
Quarles & Brady LLP
LandOfFree
Velocity based method for controlling a hydraulic system does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Velocity based method for controlling a hydraulic system, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Velocity based method for controlling a hydraulic system will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3448044