Expansible chamber devices – With inspection window in expansible chamber wall portion – With lock
Patent
1996-11-27
1999-05-11
Lopez, F. Daniel
Expansible chamber devices
With inspection window in expansible chamber wall portion
With lock
F01B31/12
Patent
active
059016337
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 along a transmission guide from an end of the cylinder housing towards the piston. The transmission guide can be a dipstick mounted within the cylinder housing or the cylinder housing itself. The dipstick or 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 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 such as dielectric constant caused by factors such as temperature, contamination and fluid type. The compensation circuit can include a pulse level analyzer, resonance circuit, capacitance circuit, compensation dipstick, or second transmitter/receiver circuit configured to measure the piston's position from the opposite end of the cylinder.
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: 4749936 (1988-06-01), Taplin
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: 5150049 (1992-09-01), Schuetz
patent: 5150060 (1992-09-01), Bitar
patent: 5182979 (1993-02-01), Morgan
patent: 5182980 (1993-02-01), Greer
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: 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.
A Physicist's Desk Reference, American Institute of Physics, New York, 1992, p. 201.
Handbook of Chemistry and Physics, CRC Press, Ohio, 1975, p. E-223.
Dorf, R.C. The Electrical Engineering Handbook, CRC Press, pp. 811-812, 1997.
Brochure, Technik, Absolute Position Measurement Using Conductive Plastic Potentiometers.
Brochure: Penny + Giles, Technology Leaders in Displacement Monitoring & Manual Control.
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.
Magazine: Business Week, Not Just a Blip on the Screen, Feb. 19, 1996.
Berger Alan D.
Chan Danley C.
Case Corporation
Lopez F. Daniel
LandOfFree
Method and apparatus for sensing piston position using a dipstic 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 using a dipstic, 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 using a dipstic will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-239607