Electricity: measuring and testing – Impedance – admittance or other quantities representative of... – Distributive type parameters
Patent
1997-11-12
1999-12-21
Regan, Maura
Electricity: measuring and testing
Impedance, admittance or other quantities representative of...
Distributive type parameters
92 1R, 91 67, 324642, G01R 2704
Patent
active
06005395&
ABSTRACT:
A system for determining the position of a piston moveable within a cylinder, or of an implement or joint, is disclosed herein. Electromagnetic (EM) bursts such as ultra-wideband or frequency pulses are generated and applied to a transmitter/receiver unit. The EM bursts are launched by the transmitter via a focusing antenna assembly from an end of the cylinder housing towards the piston. The fluid in the cylinder housing is in electrical communication with the piston such that a surface of the piston represents an electrical impedance discontinuity which causes the EM bursts to be reflected back to the receiver. The time for the EM bursts to travel from the transmitter to the piston and for the reflections to travel back to the receiver via the antenna assembly is determined and converted into a position signal representing the piston's position. A compensation signal can be used to compensate the position signal for variations in a parameter of the fluid within the cylinder. The parameter may be the dielectric constant, and the variations may be caused by factors such as temperature, contamination and fluid type. The compensation circuit can include a pulse level analyzer, resonance circuit, mini-dipstick, or a capacitance circuit.
REFERENCES:
patent: 3160836 (1964-12-01), Farley
patent: 4126047 (1978-11-01), Sethares et al.
patent: 4520660 (1985-06-01), Hitchcock
patent: 4543649 (1985-09-01), Head et al.
patent: 4584472 (1986-04-01), Wiblin et al.
patent: 4588953 (1986-05-01), Krage
patent: 4631478 (1986-12-01), Knetsch et al.
patent: 4689553 (1987-08-01), Haddox
patent: 4737705 (1988-04-01), Bitar et al.
patent: 4742794 (1988-05-01), Hagstrom
patent: 4757745 (1988-07-01), Taplin
patent: 4774465 (1988-09-01), Nilius
patent: 4866269 (1989-09-01), Wlodarczyk et al.
patent: 4901628 (1990-02-01), Krage
patent: 4938054 (1990-07-01), Dye et al.
patent: 4961055 (1990-10-01), Habib et al.
patent: 4987823 (1991-01-01), Taplin et al.
patent: 5000650 (1991-03-01), Brewer et al.
patent: 5104144 (1992-04-01), Bethell
patent: 5150060 (1992-09-01), Bitar
patent: 5182890 (1993-02-01), Greer
patent: 5182979 (1993-02-01), Morgan
patent: 5233293 (1993-08-01), Huang et al.
patent: 5241278 (1993-08-01), Bitar
patent: 5247172 (1993-09-01), Riemer
patent: 5260665 (1993-11-01), Goldberg et al.
patent: 5274271 (1993-12-01), McEwan
patent: 5325063 (1994-06-01), Morgan
patent: 5332938 (1994-07-01), McEwan
patent: 5345471 (1994-09-01), McEwan
patent: 5361070 (1994-11-01), McEwan
patent: 5421416 (1995-06-01), Orbach et al.
patent: 5422607 (1995-06-01), McEwan
patent: 5438261 (1995-08-01), Codina et al.
patent: 5438274 (1995-08-01), Bitar et al.
patent: 5455769 (1995-10-01), Panoushek et al.
patent: 5457394 (1995-10-01), McEwan
patent: 5465094 (1995-11-01), McEwan
patent: 5471147 (1995-11-01), Allen et al.
patent: 5471162 (1995-11-01), McEwan
patent: 5479120 (1995-12-01), McEwan
patent: 5491422 (1996-02-01), Bitar et al.
patent: 5510800 (1996-04-01), McEwan
patent: 5512834 (1996-04-01), McEwan
patent: 5517198 (1996-05-01), McEwan
patent: 5519342 (1996-05-01), McEwan
patent: 5519400 (1996-05-01), McEwan
patent: 5521600 (1996-05-01), McEwan
patent: 5523760 (1996-06-01), McEwan
patent: 5536536 (1996-07-01), Kelley
patent: 5540137 (1996-07-01), Lark et al.
patent: 5563605 (1996-10-01), McEwan
patent: 5573012 (1996-11-01), McEwan
patent: 5576627 (1996-11-01), McEwan
patent: 5581256 (1996-12-01), McEwan
patent: 5589838 (1996-12-01), McEwan
patent: 5609059 (1997-03-01), McEwan
patent: 5617034 (1997-04-01), Lark et al.
Brochure: Penny + Giles, Technology Leaders in Displacement Monitoring & Manual Control Jul. 1989.
Brochure: DC Hydrastar, Position Transducer.
Sensors: An LVDT Primer, Jun. 1996.
Brochure: Understanding Magnetostictive LDTS, Hydraulics & Pneumatics, by W.D. Peterson, Feb. 1993.
Brochure: Penny + Giles Product Data, Cylinder Transducer Model HLP100 Oct. 1990.
Magazine: Business Week, Not Just A Blip On The Screen, Feb. 19, 1996.
Berger Alan D.
Chan Danley C.
Case Corporation
Regan Maura
LandOfFree
Method and apparatus for sensing piston position does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method and apparatus for sensing piston position, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and apparatus for sensing piston position will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-508579