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Method and apparatus for determining and extending a change interval for an operating fluid of a unit

  • US 5,592,395 A
  • Filed: 03/01/1994
  • Issued: 01/07/1997
  • Est. Priority Date: 03/01/1993
  • Status: Expired due to Fees
First Claim
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1. A method for determining and extending a change interval for an operating fluid of a unit, comprising the steps of evaluating at least one operating variable representing a qualitative condition of the operating fluid, and continuously calculating therefrom the change interval, wherein the continuously calculated change interval is related to a specified unit service interval and, if the change interval expires before the service interval, a regeneration signal for removal of a quantity of the spent operating fluid and the replacement of said quantity with a fresh operating fluid is produced as a function of the difference therebetween.

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