(19)
(11) EP 0 552 841 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
21.12.1994 Bulletin 1994/51

(43) Date of publication A2:
28.07.1993 Bulletin 1993/30

(21) Application number: 93200129.0

(22) Date of filing: 19.01.1993
(51) International Patent Classification (IPC)5: F15B 21/04, B01D 19/00
(84) Designated Contracting States:
AT CH DE ES FR GB IT LI NL SE

(30) Priority: 23.01.1992 NL 9200128
05.06.1992 NL 9200995

(71) Applicant: Sun Electric Systems B.V.
NL-1382 LG Weesp (NL)

(72) Inventors:
  • Witt, Klaus Leonhard
    W-5100 Aken (DE)
  • Schneider, Willi
    W-8070 Ingolstadt (DE)

(74) Representative: Timmers, Cornelis Herman Johannes et al
van Exter Polak & Charlouis B.V., P.O. Box 3241
2280 GE Rijswijk
2280 GE Rijswijk (NL)


(56) References cited: : 
   
       


    (54) Method and device for detecting undissolved gas in a hydraulic control system


    (57) Method and device for detecting undissolved gas in a hydraulic control system of the type containing a hydraulic-medium-pressure pump and a feed reservoir, based upon checking the compressibility of the medium and deducting the amount of undissolved gas from the thus obtained information by taking into account that an increase of the amount of undissolved gas in the medium results in a decrease of the compressibility of this medium.






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