Method and apparatus for measuring piston position in a free pis

Details Method and apparatus for measuring piston position in a free pis Method and apparatus for measuring piston position in a free pis

1993-04-05

1994-08-30

Look, Edward K.

Pumps

Condition responsive control of drive transmission or pump...

60431, 92 13, 92 605, 318687, 417 44J, 417417, F04B 4900

Patent

active

053421760

ABSTRACT:
A method of measuring the distance at closest approach between the piston of a free piston compressor and the cylinder head. The method derives measurements of both the alternating and average components of piston position from direct measurements of the voltage and current applied to the linear permanent magnet motor that drives the piston, and thus eliminates any requirement for an additional position sensor located within the compressor.

REFERENCES:
patent: 4772838 (1988-09-01), Maresca
patent: 4966533 (1990-10-01), Uchida et al.

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